WO2008144990A1 - A general configurable rf processing method and system for navigation satellite signal - Google Patents

A general configurable rf processing method and system for navigation satellite signal Download PDF

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Publication number
WO2008144990A1
WO2008144990A1 PCT/CN2007/071072 CN2007071072W WO2008144990A1 WO 2008144990 A1 WO2008144990 A1 WO 2008144990A1 CN 2007071072 W CN2007071072 W CN 2007071072W WO 2008144990 A1 WO2008144990 A1 WO 2008144990A1
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WIPO (PCT)
Prior art keywords
frequency
configurable
digital
navigation satellite
signal
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PCT/CN2007/071072
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French (fr)
Chinese (zh)
Inventor
Hansheng Wang
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Olinkstar Corporation, Ltd.
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Application filed by Olinkstar Corporation, Ltd. filed Critical Olinkstar Corporation, Ltd.
Publication of WO2008144990A1 publication Critical patent/WO2008144990A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/33—Multimode operation in different systems which transmit time stamped messages, e.g. GPS/GLONASS
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/32—Multimode operation in a single same satellite system, e.g. GPS L1/L2

Definitions

  • the invention relates to the field of satellite navigation, in particular to a configurable universal radio frequency processing method and system for Navigating satellite signals.
  • the method and system are applicable to radio frequency processing of satellite signals of various navigation satellite systems, various frequencies and various codes. These include the US GPS system, the Galileo system in Europe, the GLONASS system in Russia, the Beidou system in China, and the new satellite navigation system and new satellite signals that may emerge in the future.
  • the invention makes it possible to receive signals of the corresponding navigation satellites according to a common radio frequency circuit, and only needs different settings according to different frequencies and bandwidths, regardless of its system, frequency and pattern, and has versatility, flexibility, and The advantage of low cost.
  • the digital intermediate frequency signal output by the RF circuit is passed through a configurable digital processing module, including a configurable digital mixer, a configurable digital filter, configurable downsampling, etc., such that the final output of the digital intermediate frequency signal has an intermediate frequency, bandwidth, and sampling.
  • a configurable digital processing module including a configurable digital mixer, a configurable digital filter, configurable downsampling, etc.
  • the frequency, the number of bits of the sampling point can be set to increase the flexibility of the output of the RF processing part, and to match the requirements of the digital baseband processing part to the maximum extent.
  • a satellite navigation system is a system in which a plurality of navigation satellite signals are received by a receiver, and the receiver performs operations based on the received navigation satellite signals to obtain a receiver position.
  • the general satellite navigation system consists of multiple navigation satellites distributed in different orbital planes to ensure that any navigation satellite can receive signals from any location within the application at any time, such as the current US GPS (Global Positioning). System Global Positioning System)
  • the system is used worldwide to ensure that at least four navigation satellites can be received at any time, anywhere in the world.
  • the satellite navigation receiver is a device that receives the navigation satellite signal and calculates the position, time, and speed according to the received satellite signal.
  • FIG. 1 is a block diagram of the components of a satellite navigation receiver.
  • Satellite navigation receivers are usually composed of hardware and software.
  • the hardware part includes the antenna, the RF section, and the baseband processing.
  • the antenna converts the navigation satellite electromagnetic waves in space into electrical signals.
  • the radio frequency part amplifies, downconverts, IFs, IFs, and digital-to-analog the navigation satellite signals, and finally outputs the digital IF signals.
  • Baseband processing is generally a digital circuit that processes digital intermediate frequency signals from the radio frequency portion, including correlators, IF carrier generation, and code clock generation.
  • the software part runs on the processor, performs operations based on the results of the baseband processing section, obtains the position, speed and time of the receiver, and simultaneously writes the control parameters to the baseband processing section.
  • the RF processing part is an indispensable part of the satellite navigation receiver and the most front-end part.
  • Figure 2 is a block diagram of the current RF processing part of the satellite navigation receiver.
  • the low noise amplifier first amplifies the RF signal. This part is at the forefront of the system and requires a low noise figure and proper gain to ensure the noise performance of the entire system.
  • Phase-locked loop The local clock multiplies the local carrier and mixes with the RF signal to obtain an intermediate frequency signal with a low frequency (several MHz to several tens of MHz).
  • the filter is a bandpass filter that filters out noise outside a certain band.
  • the analog-to-digital conversion is a digital signal in which an intermediate frequency analog signal is changed to one or more bits, and the digital signal can be further subjected to digital signal processing.
  • L1 signals frequency is 1. 57542 GHz
  • L2 signals frequency is 1. 2276 GHz
  • C/A codes bandwidth 2 MHz
  • P codes bandwidth 20 MHz
  • L5 signal frequency is 1. 17645GHz
  • the circuit using the above-mentioned existing navigation satellite radio frequency processing method can only receive and receive a single type of navigation satellite signal fixedly, for example, can only receive the C/A code of the L1 frequency, and if it is to receive the navigation satellite signal of other frequencies, Use another circuit.
  • the present invention provides a configurable universal radio frequency processing method for navigation satellite signals in view of the deficiencies or deficiencies in the prior art.
  • the present invention also provides a configurable universal radio frequency processing system for navigating satellite signals.
  • a configurable universal radio frequency processing method for Navigating satellite signals comprising the steps of: amplifying a navigation satellite radio frequency signal by using a broadband low noise amplifier, the working range of the broadband low noise amplifier covering two or more navigation satellite radio frequency signals Mixing the amplified navigation satellite RF signal with a frequency-configurable local carrier to obtain an intermediate frequency signal.
  • a frequency-configurable local carrier is generated using a configurable phase-locked loop.
  • the frequency of the navigation satellite radio frequency signal is in the range of l ⁇ 2 GHz.
  • f IF is the intermediate frequency of the intermediate frequency signal
  • f s is the frequency of the navigation satellite signal, f.
  • the local carrier frequency; and the f s of the navigation satellite signals of different frequencies are different, by selecting the corresponding f. , so that the intermediate frequency f IF is kept substantially constant.
  • the digital intermediate frequency signal performs one or more of the following digital processing: digital mixing, digital filtering, digital downsampling; after digital processing, the intermediate frequency, bandwidth, and sampling rate of the digital intermediate frequency signal can be changed.
  • a configurable general-purpose RF processing system for Navigating satellite signals comprising a mixer, the mixer being respectively connected to a low noise amplifier and a phase locked loop, wherein: the low noise amplifier is a broadband low noise amplifier, and its working range covers two Or more than two kinds of navigation satellite radio frequency signals; the phase locked loop is a configurable phase locked loop having a data interface; the data interface is used to write configuration information, and the configurable phase locked loop generates a frequency settable Local carrier.
  • f IF is the intermediate frequency of the intermediate frequency signal, which is the frequency of the navigation satellite signal, f.
  • the local carrier frequency and the f s of the navigation satellite signals of different frequencies are different, by selecting the corresponding f. , so that the intermediate frequency f IF is kept substantially constant.
  • intermediate frequency amplifiers are sequentially connected intermediate frequency amplifiers, filters, gain control amplifiers, and analog to digital converters, the intermediate frequency amplifiers being coupled to the mixers, the analog to digital converters being coupled to one or more of the following configurable digital processing modules Series: Configurable digital mixer, configurable digital filter, configurable downsampling; various configuration information written via data interface; configurable downsampled output digital IF signal.
  • the configurable universal radio frequency processing method and system for the navigation satellite signal of the invention is a new universally programmable radio frequency processing technology for navigation satellite signals, and has a universal and unified circuit, which can receive when different settings are made.
  • the navigation satellite signals with different frequencies and bandwidths are simple in structure, low in cost and high in flexibility, which is beneficial to the design of multi-mode satellite navigation receivers.
  • the multimode satellite navigation receiver embodying the present invention can be implemented either by discrete components or by integrated circuits.
  • Figure 1 is a block diagram of the components of a satellite navigation receiver.
  • FIG. 2 is a schematic block diagram of a radio frequency processing portion of a satellite navigation receiver in the prior art.
  • FIG. 3 is a schematic block diagram of a general configurable radio frequency processing method for a navigation satellite signal of the present invention.
  • FIG. 4 is a block diagram of a general configurable radio frequency processing system for a navigation satellite signal of the present invention.
  • FIG. 5 is a block diagram of a radio frequency processing system with a configurable digital processing module of the present invention. detailed description
  • the RF signal is amplified by broadband low-noise, and its bandwidth should cover the entire satellite navigation band, which can perform low-noise amplification of navigation satellite signals of different frequencies.
  • the signals of the existing navigation satellites are all in the range of 1 to 2 GHz, and the working range of the low noise amplification can be set to 1 to 2 GHz.
  • the low-noise amplification of the radio frequency portion of the existing satellite navigation receiver has a narrow working range, and generally covers only the received navigation satellite signals, for example, for a receiver that can only receive GPS L1 frequency C/A, low noise amplification.
  • the working range is centered on 1. 57542 GHz, and the bandwidth is generally several tens of MHz.
  • the frequency of the local carrier can be set instead of fixed.
  • the f s of the navigation satellite signals of different frequencies is different by selecting the corresponding f.
  • the intermediate frequency f IF is kept substantially constant, which can facilitate subsequent processing.
  • the signal frequency f s is 1. 57542 GHz, then the local carrier frequency f. Can be set to 1. 56542GHz; for GPS L2 signal, the signal frequency f s is 1. 2276GHz, then the local carrier frequency f. It can be set to 1. 2176 GHz; for the GL0NASS signal, the signal frequency f s is 1. 602 GHz, then the local carrier frequency f. It can be set to 1. 592 GHz; for the Galileo E6 signal, the signal frequency f s is 1.27875 GHz, then the local carrier frequency f.
  • the local carrier frequency in the RF portion of the existing satellite navigation receiver is fixed.
  • the IF amplification, filtering, gain control amplification, and analog-to-digital conversion are basically the same as the RF processing methods of the existing satellite navigation receivers.
  • the signal after the analog-to-digital conversion, can be selectively digitally processed, including digital mixing, digital filtering, digital downsampling, and digital processing can include one or more of them.
  • digital processing After digital processing, the IF frequency, bandwidth, and sampling rate of the digital IF signal can be changed.
  • the bandwidth of the low-noise amplifier should cover the entire satellite navigation band, and the low-noise amplification of the navigation satellite signals of different frequencies can be performed.
  • the bandwidth of the low-noise amplifier of the radio frequency part of the existing satellite navigation receiver is narrow, generally only the coverage area.
  • the phase locked loop is configurable and can generate local carrier signals of different frequencies depending on the frequency of the navigation satellite signals to be received.
  • the role of the mixer is to mix and get the IF signal.
  • the configurable phase-locked loop also produces a corresponding f.
  • the intermediate frequency f IF is kept substantially constant, which can facilitate the processing of the latter circuit.
  • the local carrier frequency in the RF portion of the existing satellite navigation receiver is fixed.
  • the IF amplifier, filter, gain control amplifier, and analog-to-digital converter are basically the same as those in the RF portion of the existing satellite navigation receiver, and the digital IF signal is finally obtained.
  • the data interface is used to write configuration information, and can be any data interface such as an SPI interface.
  • the digital intermediate frequency signal is used as the input of the digital baseband processing part.
  • the digital baseband processing part has different requirements for the digital intermediate frequency signal, including changing the bandwidth of the digital intermediate frequency signal, the intermediate frequency, the sampling frequency, the number of sampling points, and the like. Therefore, as shown in FIG. 5, on the basis of the implementation device of FIG. 4, several configurable digital processing modules can be added.
  • Configurable digital mixers can set different local carrier frequencies according to requirements, arbitrarily change the IF frequency to obtain a new IF frequency; Configurable digital filter order, coefficient can be set, bandwidth can be set and filtered Features, such as a 20MHz bandwidth signal can be changed to a 2MHz bandwidth signal, and can also filter out signals of certain frequency bands; configurable downsampling can arbitrarily reduce the sampling rate of digital IF signals, such as when the signal bandwidth is small and the IF frequency is low. A lower sampling frequency can be used to reduce the speed of the digital baseband processing portion.
  • the configurable meanings in the above modules also include the processing of the digital intermediate frequency signal without passing through one or several of the modules.
  • the configurable digital processing module increases the flexibility of the RF processing section output to best match the requirements of the digital baseband processing section.
  • Various configuration information is also written through a data interface.
  • the invention is applicable to radio frequency processing of satellite signals of various navigation satellite systems, various frequencies and various codes, including the GPS system of the United States, the Galileo system of Europe, the GLONASS system of Russia, the Beidou system of China, etc., and may appear in the future.
  • the new satellite navigation system and new satellite signals also include wide-area enhanced satellite signals, such as the existing North American WAAS system, the European EGNOS system, and the new wide-area enhanced satellite system that may emerge in the future.
  • the invention enables a fixed universal radio frequency circuit to receive signals of any navigation satellite through different settings, regardless of its system, frequency and pattern, and has the advantages of versatility, flexibility and low cost.
  • the RF processing method can be implemented either by discrete components or by an integrated circuit.
  • the method and system of the present invention have the following features:
  • the main innovations are: wideband low noise amplifier covering the entire satellite navigation signal band; configurable phase-locked loop to generate a local carrier with frequency settable; for different frequency navigation satellite signals, the intermediate frequency is basically fixed to simplify the latter circuit .
  • Add configurable digital processing module including configurable digital mixer, configurable digital filter, configurable downsampling, so that the IF frequency, bandwidth, sampling frequency, and sampling point number of the final output digital IF signal can be Set to increase the flexibility of the RF processing section output to best match the requirements of the digital baseband processing section.
  • the configurable digital processing module can be one or more of the foregoing.
  • the data interface is used to write various configuration information.

Abstract

A general configurable RF processing method includes: amplifying navigation satellite RF signals by using a wideband low-noise amplifier of which the operating range covers two or more kinds of navigation satellite RF signals, mixing the amplified navigation satellite RF signals with the local carrier wave in which the frequency is configurable, obtaining intermediate frequency signals. The local carrier wave with configurable frequency is generated by using a configurable phase locked loop.

Description

导航卫星信号的可配置通用射频处理方法和系统  Configurable universal radio frequency processing method and system for navigation satellite signals
技术领域 Technical field
本发明涉及卫星导航领域，特别是一种导航卫星信号的可配置通用射频处理方法和系统， 该方法和系统适用于各种导航卫星体制、 各种频率、 各种码的卫星信号的射频处理， 包括美 国的 GPS系统、 欧洲的伽利略系统、 俄罗斯的 GLONASS系统、 中国的北斗系统等， 以及未 来可能出现的新的卫星导航体制和新的卫星信号。本发明使得可以基于一个通用的射频电路， 只需要根据不同的频率、 带宽， 经过不同的设置， 就可以接收相应导航卫星的信号， 不论其 体制、 频率和码型， 具有通用性、 灵活性、 成本低的优点。 另外， 射频电路输出的数字中频 信号经过可配置数字处理模块， 包括可配置数字混频器， 可配置数字滤波器， 可配置降采样 等， 使得最终输出的数字中频信号的中频频率、 带宽、 采样频率、 采样点的比特数可设置， 以增加射频处理部分输出的灵活性， 最大限度的与数字基带处理部分的要求匹配。 背景技术  The invention relates to the field of satellite navigation, in particular to a configurable universal radio frequency processing method and system for Navigating satellite signals. The method and system are applicable to radio frequency processing of satellite signals of various navigation satellite systems, various frequencies and various codes. These include the US GPS system, the Galileo system in Europe, the GLONASS system in Russia, the Beidou system in China, and the new satellite navigation system and new satellite signals that may emerge in the future. The invention makes it possible to receive signals of the corresponding navigation satellites according to a common radio frequency circuit, and only needs different settings according to different frequencies and bandwidths, regardless of its system, frequency and pattern, and has versatility, flexibility, and The advantage of low cost. In addition, the digital intermediate frequency signal output by the RF circuit is passed through a configurable digital processing module, including a configurable digital mixer, a configurable digital filter, configurable downsampling, etc., such that the final output of the digital intermediate frequency signal has an intermediate frequency, bandwidth, and sampling. The frequency, the number of bits of the sampling point can be set to increase the flexibility of the output of the RF processing part, and to match the requirements of the digital baseband processing part to the maximum extent. Background technique
卫星导航系统是一种通过接收机接收多颗导航卫星信号， 接收机根据接收到的导航卫星 信号进行运算得到接收机位置的系统。 一般卫星导航系统由分布于不同轨道平面的多颗导航 卫星组成， 以保证在任何时间， 应用范围内的任何地点都可以接收到多颗导航卫星的信号， 比如对于现在运行的美国 GPS (Global Positioning System全球定位系统） 系统的应用范围 是全球， 就要保证在任何时间、 全球的任何地点可以接收到至少四颗导航卫星的信号。 卫星 导航接收机就是接收导航卫星信号， 并根据接收到的卫星信号经过运算， 得到位置、 时间、 速度的装置。  A satellite navigation system is a system in which a plurality of navigation satellite signals are received by a receiver, and the receiver performs operations based on the received navigation satellite signals to obtain a receiver position. The general satellite navigation system consists of multiple navigation satellites distributed in different orbital planes to ensure that any navigation satellite can receive signals from any location within the application at any time, such as the current US GPS (Global Positioning). System Global Positioning System) The system is used worldwide to ensure that at least four navigation satellites can be received at any time, anywhere in the world. The satellite navigation receiver is a device that receives the navigation satellite signal and calculates the position, time, and speed according to the received satellite signal.
图 1是卫星导航接收机的组成的原理框图。 卫星导航接收机通常由硬件和软件两部分组 成。 硬件部分包括天线、 射频部分、 基带处理。 天线将空间中的导航卫星电磁波转变为电信 号。 射频部分将导航卫星信号放大、 下变频、 中频滤波、 中频放大、 数模变换， 最后输出数 字中频信号。 基带处理一般是数字电路， 处理来自射频部分的数字中频信号， 主要包括相关 器、 中频载波生成、 码时钟生成等部分。 软件部分运行在处理器上， 根据基带处理部分的结 果进行运算，得到接收机的位置、 速度和时间等， 同时写入控制参数到基带处理部分。  Figure 1 is a block diagram of the components of a satellite navigation receiver. Satellite navigation receivers are usually composed of hardware and software. The hardware part includes the antenna, the RF section, and the baseband processing. The antenna converts the navigation satellite electromagnetic waves in space into electrical signals. The radio frequency part amplifies, downconverts, IFs, IFs, and digital-to-analog the navigation satellite signals, and finally outputs the digital IF signals. Baseband processing is generally a digital circuit that processes digital intermediate frequency signals from the radio frequency portion, including correlators, IF carrier generation, and code clock generation. The software part runs on the processor, performs operations based on the results of the baseband processing section, obtains the position, speed and time of the receiver, and simultaneously writes the control parameters to the baseband processing section.
射频处理部分是卫星导航接收机的必不可少的部分， 也是最前端的部分， 图 2是目前卫 星导航接收机射频处理部分的原理框图。 低噪声放大器先将射频信号放大， 该部分处于系统 的最前端， 要求具有较低的噪声系数和适当的增益， 以保证整个系统的噪声性能。 锁相环将 本地时钟倍频产生本地载波， 与射频信号混频， 得到频率较低 （几 MHz〜几十 MHz ) 的中频信 号。 滤波器是一带通滤波器， 将一定频带外的噪声滤除。 当模数变换多于 1 比特时， 需要增 益控制放大器以保证输入模数变换的信号的幅度合适， 如果模数变换只是 1 比特， 则只需要 一般的放大器。 模数变换是将中频模拟信号变为 1 比特或多比特的数字信号， 数字信号可以 被进一步进行数字信号处理。 上述结构虽然被目前所有市场上的卫星导航接收机采用， 但其 存在如下不足之处。 目前国际上存在着多种卫星导航体制， 包括美国的 GPS系统、 俄罗斯的 GL0NASS 系统、 欧洲的伽利略系统、 中国的北斗系统等， 以后也有可能会出现更多的卫星导 航系统。 不同体制的导航卫星信号的结构不同， 包括频率、 带宽、 码型等都不一样， 即使是 同一个卫星导航体制， 也存在着不同频率和带宽的多种信号。 如 GPS系统中既有 L1信号（频 率是 1· 57542GHz ), 也有 L2信号 （频率是 1. 2276GHz )， L1信号中又有 C/A码 (带宽 2MHz ) 和 P码（带宽 20MHz )， 以后还会增加 L5信号（频率是 1. 17645GHz )。 而采用上述现有导航卫 星射频处理方法的电路由于参数固定， 只能固定接收单一类型的导航卫星信号， 如只能接收 L1频率的 C/A码， 如果要接收其它频率的导航卫星信号， 则要采用另外的电路。 随着导航卫 星体制的增加， 及新频率、 新信号的出现， 将会有越来越多不同的射频电路接收导航卫星信 号。 这将不利于多模卫星导航接收机的设计， 电路缺乏灵活性， 成本也相对较高。 发明内容 The RF processing part is an indispensable part of the satellite navigation receiver and the most front-end part. Figure 2 is a block diagram of the current RF processing part of the satellite navigation receiver. The low noise amplifier first amplifies the RF signal. This part is at the forefront of the system and requires a low noise figure and proper gain to ensure the noise performance of the entire system. Phase-locked loop The local clock multiplies the local carrier and mixes with the RF signal to obtain an intermediate frequency signal with a low frequency (several MHz to several tens of MHz). The filter is a bandpass filter that filters out noise outside a certain band. When the analog-to-digital conversion is more than 1 bit, a gain control amplifier is required to ensure that the amplitude of the signal of the input analog-to-digital conversion is appropriate. If the analog-to-digital conversion is only 1 bit, only a general amplifier is required. The analog-to-digital conversion is a digital signal in which an intermediate frequency analog signal is changed to one or more bits, and the digital signal can be further subjected to digital signal processing. Although the above structure is adopted by satellite navigation receivers in all current markets, it has the following disadvantages. At present, there are many satellite navigation systems in the world, including the US GPS system, Russia's GL0NASS system, Europe's Galileo system, China's Beidou system, etc., and more satellite navigation systems may appear in the future. Different systems of navigation satellite signals have different structures, including frequency, bandwidth, and pattern. Even with the same satellite navigation system, there are multiple signals with different frequencies and bandwidths. For example, in the GPS system, there are both L1 signals (frequency is 1. 57542 GHz) and L2 signals (frequency is 1. 2276 GHz). In the L1 signal, there are C/A codes (bandwidth 2 MHz) and P codes (bandwidth 20 MHz). Will increase the L5 signal (frequency is 1. 17645GHz). The circuit using the above-mentioned existing navigation satellite radio frequency processing method can only receive and receive a single type of navigation satellite signal fixedly, for example, can only receive the C/A code of the L1 frequency, and if it is to receive the navigation satellite signal of other frequencies, Use another circuit. With the increase of navigation satellite systems and the emergence of new frequencies and new signals, more and more different RF circuits will receive navigation satellite signals. This will not be conducive to the design of multi-mode satellite navigation receivers, the circuit is inflexible and the cost is relatively high. Summary of the invention
本发明针对现有技术中存在的缺陷或不足， 提供一种导航卫星信号的可配置通用射频处 理方法。  The present invention provides a configurable universal radio frequency processing method for navigation satellite signals in view of the deficiencies or deficiencies in the prior art.
本发明还提供一种导航卫星信号的可配置通用射频处理系统。  The present invention also provides a configurable universal radio frequency processing system for navigating satellite signals.
本发明技术方案如下：  The technical scheme of the present invention is as follows:
导航卫星信号的可配置通用射频处理方法， 其特征在于包括以下步骤： 利用宽带低噪声 放大器对导航卫星射频信号进行放大， 宽带低噪声放大器的工作范围覆盖两种或两种以上的 导航卫星射频信号； 将放大的导航卫星射频信号与频率可设置的本地载波进行混频， 得到中 频信号。  A configurable universal radio frequency processing method for Navigating satellite signals, comprising the steps of: amplifying a navigation satellite radio frequency signal by using a broadband low noise amplifier, the working range of the broadband low noise amplifier covering two or more navigation satellite radio frequency signals Mixing the amplified navigation satellite RF signal with a frequency-configurable local carrier to obtain an intermediate frequency signal.
利用可配置锁相环产生频率可设置的本地载波。  A frequency-configurable local carrier is generated using a configurable phase-locked loop.
所述导航卫星射频信号的频率位于 l〜2GHz的范围内。  The frequency of the navigation satellite radio frequency signal is in the range of l~2 GHz.
本地载波的频率设置符合以下关系式： fIF= | fs-f。l， 其中 fIF为中频信号的中频频率， fs 为导航卫星信号频率， f。为本地载波频率； 并且不同频率的导航卫星信号的 fs不同， 通过选 择相应的 f。， 使得中频频率 fIF基本保持恒定。 The frequency setting of the local carrier conforms to the following relationship: f IF = | f s -f. l, where f IF is the intermediate frequency of the intermediate frequency signal, and f s is the frequency of the navigation satellite signal, f. For the local carrier frequency; and the f s of the navigation satellite signals of different frequencies are different, by selecting the corresponding f. , so that the intermediate frequency f IF is kept substantially constant.
还包括中频放大、 滤波、 增益控制放大和模数变换步骤， 在模数变换之后， 有选择地对 数字中频信号进行以下的一种或几种数字处理： 数字混频、 数字滤波、 数字降采样； 经过数 字处理后， 数字中频信号的中频频率、 带宽、 采样率都可以被改变。 Also includes intermediate frequency amplification, filtering, gain control amplification, and analog to digital conversion steps, after analog to digital conversion, selectively The digital intermediate frequency signal performs one or more of the following digital processing: digital mixing, digital filtering, digital downsampling; after digital processing, the intermediate frequency, bandwidth, and sampling rate of the digital intermediate frequency signal can be changed.
导航卫星信号的可配置通用射频处理系统， 包括混频器， 该混频器分别连接低噪声放大 器和锁相环， 其特征在于： 所述低噪声放大器为宽带低噪声放大器， 其工作范围覆盖两种或 两种以上的导航卫星射频信号； 所述锁相环为具有数据接口的可配置锁相环； 所述数据接口 用于写入配置信息， 所述可配置锁相环产生频率可设置的本地载波。  A configurable general-purpose RF processing system for Navigating satellite signals, comprising a mixer, the mixer being respectively connected to a low noise amplifier and a phase locked loop, wherein: the low noise amplifier is a broadband low noise amplifier, and its working range covers two Or more than two kinds of navigation satellite radio frequency signals; the phase locked loop is a configurable phase locked loop having a data interface; the data interface is used to write configuration information, and the configurable phase locked loop generates a frequency settable Local carrier.
所述导航卫星射频信号的频率位于 l〜2GHz的范围内； 可配置锁相环产生频率可设置的 本地载波； 本地载波的频率设置符合以下关系式： fIF= | fs_f。|， 其中 fIF为中频信号的中频频 率， 为导航卫星信号频率， f。为本地载波频率； 并且不同频率的导航卫星信号的 fs不同， 通过选择相应的 f。， 使得中频频率 fIF基本保持恒定。 The frequency of the navigation satellite radio frequency signal is in the range of l~2 GHz; the phase-locked loop can be configured to generate a local carrier whose frequency can be set; the frequency setting of the local carrier conforms to the following relationship: f IF = | f s _f. |, where f IF is the intermediate frequency of the intermediate frequency signal, which is the frequency of the navigation satellite signal, f. For the local carrier frequency; and the f s of the navigation satellite signals of different frequencies are different, by selecting the corresponding f. , so that the intermediate frequency f IF is kept substantially constant.
还包括顺序连接的中频放大器、 滤波器、 增益控制放大器和模数变换器， 所述中频放大 器连接所述混频器， 所述模数变换器与以下的一个或几个可配置数字处理模块相串联： 可配 置数字混频器， 可配置数字滤波器， 可配置降采样； 各种配置信息通过数据接口写入； 所述 可配置降采样输出数字中频信号。  Also included are sequentially connected intermediate frequency amplifiers, filters, gain control amplifiers, and analog to digital converters, the intermediate frequency amplifiers being coupled to the mixers, the analog to digital converters being coupled to one or more of the following configurable digital processing modules Series: Configurable digital mixer, configurable digital filter, configurable downsampling; various configuration information written via data interface; configurable downsampled output digital IF signal.
本发明技术效果如下：  The technical effects of the present invention are as follows:
本发明的导航卫星信号的可配置通用射频处理方法和系统， 是一种新的导航卫星信号的 通用可编程配置的射频处理技术， 具有通用、 统一的电路， 当进行不同的设置时， 可以接收 不同频率、 带宽的导航卫星信号， 结构简单、 成本低、 灵活性高， 有利于多模卫星导航接收 机的设计。  The configurable universal radio frequency processing method and system for the navigation satellite signal of the invention is a new universally programmable radio frequency processing technology for navigation satellite signals, and has a universal and unified circuit, which can receive when different settings are made. The navigation satellite signals with different frequencies and bandwidths are simple in structure, low in cost and high in flexibility, which is beneficial to the design of multi-mode satellite navigation receivers.
采用本发明的多模卫星导航接收机既可以通过分立元器件实现， 也可以通过集成电路实 现。 附图说明  The multimode satellite navigation receiver embodying the present invention can be implemented either by discrete components or by integrated circuits. DRAWINGS
图 1是卫星导航接收机的组成的原理框图。  Figure 1 is a block diagram of the components of a satellite navigation receiver.
图 2是现有技术中卫星导航接收机射频处理部分的原理框图。  2 is a schematic block diagram of a radio frequency processing portion of a satellite navigation receiver in the prior art.
图 3是本发明的导航卫星信号的通用可配置射频处理方法的原理框图。  3 is a schematic block diagram of a general configurable radio frequency processing method for a navigation satellite signal of the present invention.
图 4是本发明的导航卫星信号的通用可配置射频处理系统的原理框图。  4 is a block diagram of a general configurable radio frequency processing system for a navigation satellite signal of the present invention.
图 5是本发明的带有可配置数字处理模块的射频处理系统的原理框图。 具体实施方式  5 is a block diagram of a radio frequency processing system with a configurable digital processing module of the present invention. detailed description
下面结合附图对本发明作进一步的详细说明。 图 3为本发明的导航卫星信号的通用可配置射频处理方法的原理框图。 首先， 射频信号 经过宽带低噪声放大， 其带宽应覆盖整个卫星导航波段， 可对不同频率的导航卫星信号进行 低噪声放大。 例如， 现有的导航卫星的信号都在 l〜2GHz范围内， 低噪声放大的工作范围可 定为 l〜2GHz。 现有的卫星导航接收机的射频部分的低噪声放大的工作范围较窄， 一般只是 覆盖所接收的导航卫星信号， 例如， 对于目前只能接收 GPS L1频率 C/A的接收机， 低噪声放 大的工作范围是以 1. 57542GHz为中心频率， 带宽一般为几十 MHz。 本地载波的频率可设置而 不是固定的， 本地载波与射频信号混频得到中频信号， 中频信号的频率 fIF= | fs-f。l， 其中 fs 为导航卫星信号频率， f。为本地载波频率。 不同频率的导航卫星信号的 fs不同， 通过选择相 应的 f。， 使得中频频率 fIF基本保持恒定， 这样可以便于后面的处理。 例如， 如果要使 fIF保 持为 10MHz , 对于 GPS L1 信号， 信号频率 f s为 1. 57542GHz， 则本地载波频率 f。可以设为 1. 56542GHz ; 对于 GPS L2 信号， 信号频率 f s为 1. 2276GHz， 则本地载波频率 f。可以设为 1. 2176GHz ; 对于 GL0NASS 信号， 信号频率 f s为 1. 602GHz， 则本地载波频率 f。可以设为 1. 592GHz ; 对于伽利略 E6信号， 信号频率 f s为 1. 27875GHz , 则本地载波频率 f。可以设为 1. 26875GHz ; 对于伽利略 E5a信号， 信号频率 为 1. 17645GHz , 则本地载波频率 f。可以设为 1. 16645GHz ; 对于北斗 B1信号， 信号频率 fs为 1. 561098GHz , 则本地载波频率 f。可以设为 1. 551098GHz。而现有的卫星导航接收机射频部分中的本地载波频率是固定不变的。中频放大、 滤波、 增益控制放大、 模数变换部分基本与现有的卫星导航接收机的射频处理方法相同。 根 据需要， 在模数变换之后， 可有选择的对信号进行数字处理， 包括数字混频、 数字滤波、 数 字降采样， 数字处理可以包括其中的一种或几种。 经过数字处理后， 数字中频信号的中频频 率、 带宽、 采样率都可以被改变。 The invention will be further described in detail below with reference to the accompanying drawings. 3 is a schematic block diagram of a general configurable radio frequency processing method for a navigation satellite signal of the present invention. First, the RF signal is amplified by broadband low-noise, and its bandwidth should cover the entire satellite navigation band, which can perform low-noise amplification of navigation satellite signals of different frequencies. For example, the signals of the existing navigation satellites are all in the range of 1 to 2 GHz, and the working range of the low noise amplification can be set to 1 to 2 GHz. The low-noise amplification of the radio frequency portion of the existing satellite navigation receiver has a narrow working range, and generally covers only the received navigation satellite signals, for example, for a receiver that can only receive GPS L1 frequency C/A, low noise amplification. The working range is centered on 1. 57542 GHz, and the bandwidth is generally several tens of MHz. The frequency of the local carrier can be set instead of fixed. The local carrier is mixed with the RF signal to obtain the intermediate frequency signal, and the frequency of the intermediate frequency signal is f IF = | f s -f. l, where f s is the frequency of the navigation satellite signal, f. Is the local carrier frequency. The f s of the navigation satellite signals of different frequencies is different by selecting the corresponding f. , so that the intermediate frequency f IF is kept substantially constant, which can facilitate subsequent processing. For example, if f IF is to be kept at 10 MHz, for GPS L1 signal, the signal frequency f s is 1. 57542 GHz, then the local carrier frequency f. Can be set to 1. 56542GHz; for GPS L2 signal, the signal frequency f s is 1. 2276GHz, then the local carrier frequency f. It can be set to 1. 2176 GHz; for the GL0NASS signal, the signal frequency f s is 1. 602 GHz, then the local carrier frequency f. It can be set to 1. 592 GHz; for the Galileo E6 signal, the signal frequency f s is 1.27875 GHz, then the local carrier frequency f. It can be set to 1.26875GHz; for the Galileo E5a signal, the signal frequency is 1.17645GHz, then the local carrier frequency f. It can be set to 1.16645GHz; for the Beidou B1 signal, the signal frequency f s is 1.561098GHz, then the local carrier frequency f. Can be set to 1. 551098GHz. The local carrier frequency in the RF portion of the existing satellite navigation receiver is fixed. The IF amplification, filtering, gain control amplification, and analog-to-digital conversion are basically the same as the RF processing methods of the existing satellite navigation receivers. According to requirements, after the analog-to-digital conversion, the signal can be selectively digitally processed, including digital mixing, digital filtering, digital downsampling, and digital processing can include one or more of them. After digital processing, the IF frequency, bandwidth, and sampling rate of the digital IF signal can be changed.
图 4为本发明的导航卫星信号的通用可配置射频处理系统的原理框图。 首先， 低噪声放 大器的带宽应覆盖整个卫星导航波段， 可对不同频率的导航卫星信号进行低噪声放大， 现有 的卫星导航接收机的射频部分的低噪声放大器的带宽较窄， 一般只是覆盖所接收的导航卫星 信号。 锁相环为可配置， 根据要接收的导航卫星信号的频率， 可以产生出不同频率的本地载 波信号。 混频器的作用是混频得到中频信号。 当导航卫星信号频率的 不同时， 可配置锁相 环也产生相对应的 f。， 使得中频频率 fIF基本保持恒定， 这样可以便于后面电路的处理。 而现 有的卫星导航接收机射频部分中的本地载波频率是固定不变的。 中频放大器、 滤波器、 增益 控制放大器、 模数变换器部分基本与现有的卫星导航接收机的射频部分中的相同， 最终可得 到数字中频信号。 数据接口是用于写入配置信息， 可以是如 SPI接口等的任意数据接口。 4 is a schematic block diagram of a general configurable radio frequency processing system for a navigation satellite signal of the present invention. First, the bandwidth of the low-noise amplifier should cover the entire satellite navigation band, and the low-noise amplification of the navigation satellite signals of different frequencies can be performed. The bandwidth of the low-noise amplifier of the radio frequency part of the existing satellite navigation receiver is narrow, generally only the coverage area. Received navigation satellite signals. The phase locked loop is configurable and can generate local carrier signals of different frequencies depending on the frequency of the navigation satellite signals to be received. The role of the mixer is to mix and get the IF signal. When the frequency of the navigation satellite signal is different, the configurable phase-locked loop also produces a corresponding f. , so that the intermediate frequency f IF is kept substantially constant, which can facilitate the processing of the latter circuit. The local carrier frequency in the RF portion of the existing satellite navigation receiver is fixed. The IF amplifier, filter, gain control amplifier, and analog-to-digital converter are basically the same as those in the RF portion of the existing satellite navigation receiver, and the digital IF signal is finally obtained. The data interface is used to write configuration information, and can be any data interface such as an SPI interface.
数字中频信号作为数字基带处理部分的输入， 有时数字基带处理部分对于数字中频信号 有不同的要求， 包括要改变数字中频信号的带宽、 中频频率、 采样频率、 采样点比特数等。 所以， 如图 5所示， 在图 4的实现装置的基础之上， 还可以增加几个可配置数字处理模块。 其中包括： 可配置数字混频器可以根据要求设置不同的本地载波频率， 任意改变中频频率， 得到新的中频频率； 可配置数字滤波器的阶数、 系数可设， 可以任意设定带宽和滤波特性， 如可以将 20MHz带宽的信号变为 2MHz带宽的信号， 还可以滤除某些指定频带的信号； 可配置 降采样可以任意降低数字中频信号的采样率， 如当信号带宽小、 中频频率低时， 可以采用较 低的采样频率， 以降低数字基带处理部分的运算速度。 另外， 上述各模块中的可配置的含义 还包括数字中频信号也可以不经过其中的一个或几个模块的处理。 可配置数字处理模块可以 增加射频处理部分输出的灵活性， 可以最大限度的与数字基带处理部分的要求匹配。 各种配 置信息也是通过一个数据接口写入。 The digital intermediate frequency signal is used as the input of the digital baseband processing part. Sometimes the digital baseband processing part has different requirements for the digital intermediate frequency signal, including changing the bandwidth of the digital intermediate frequency signal, the intermediate frequency, the sampling frequency, the number of sampling points, and the like. Therefore, as shown in FIG. 5, on the basis of the implementation device of FIG. 4, several configurable digital processing modules can be added. These include: Configurable digital mixers can set different local carrier frequencies according to requirements, arbitrarily change the IF frequency to obtain a new IF frequency; Configurable digital filter order, coefficient can be set, bandwidth can be set and filtered Features, such as a 20MHz bandwidth signal can be changed to a 2MHz bandwidth signal, and can also filter out signals of certain frequency bands; configurable downsampling can arbitrarily reduce the sampling rate of digital IF signals, such as when the signal bandwidth is small and the IF frequency is low. A lower sampling frequency can be used to reduce the speed of the digital baseband processing portion. In addition, the configurable meanings in the above modules also include the processing of the digital intermediate frequency signal without passing through one or several of the modules. The configurable digital processing module increases the flexibility of the RF processing section output to best match the requirements of the digital baseband processing section. Various configuration information is also written through a data interface.
本发明适用于各种导航卫星体制、 各种频率、 各种码的卫星信号的射频处理， 包括美国 的 GPS系统、 欧洲的伽利略系统、 俄罗斯的 GLONASS系统、 中国的北斗系统等， 以及未来 可能出现的新的卫星导航体制和新的卫星信号， 也包括广域增强卫星信号， 如现有的北美的 WAAS系统、 欧洲的 EGNOS系统， 以及以后可能出现的新的广域增强卫星系统。 本发明可 以使一个固定的通用的射频电路， 经过不同的设置， 就可以接收任意导航卫星的信号， 不论 其体制、 频率和码型， 具有通用性、 灵活性、 成本低的优点。 该射频处理方法既可以通过分 立元器件实现， 也可以通过集成电路实现。  The invention is applicable to radio frequency processing of satellite signals of various navigation satellite systems, various frequencies and various codes, including the GPS system of the United States, the Galileo system of Europe, the GLONASS system of Russia, the Beidou system of China, etc., and may appear in the future. The new satellite navigation system and new satellite signals also include wide-area enhanced satellite signals, such as the existing North American WAAS system, the European EGNOS system, and the new wide-area enhanced satellite system that may emerge in the future. The invention enables a fixed universal radio frequency circuit to receive signals of any navigation satellite through different settings, regardless of its system, frequency and pattern, and has the advantages of versatility, flexibility and low cost. The RF processing method can be implemented either by discrete components or by an integrated circuit.
本发明的方法和系统具有以下特点：  The method and system of the present invention have the following features:
1.可以应用于任何卫星导航体制， 包括美国的 GPS系统， 俄罗斯 GLONASS系统， 欧洲的 伽利略系统， 中国的北斗系统， 以及以后可能出现的新的卫星导航体制和新的导航卫星信号。  1. Can be applied to any satellite navigation system, including the US GPS system, the Russian GLONASS system, the European Galileo system, China's Beidou system, and new satellite navigation systems and new navigation satellite signals that may emerge in the future.
2.可以处理广域增强卫星信号， 包括现有的北美的 WAAS系统、 欧洲的 EGNOS系统， 以及以后可能出现的新的广域增强卫星系统。  2. Can handle wide-area enhanced satellite signals, including existing North American WAAS systems, European EGNOS systems, and new wide-area enhanced satellite systems that may emerge in the future.
3.主要创新点是： 宽带低噪声放大器， 覆盖整个卫星导航信号波段； 可配置锁相环产生 频率可设置的本地载波； 对不同频率的导航卫星信号， 中频频率基本固定， 以简化后面的电 路。  3. The main innovations are: wideband low noise amplifier covering the entire satellite navigation signal band; configurable phase-locked loop to generate a local carrier with frequency settable; for different frequency navigation satellite signals, the intermediate frequency is basically fixed to simplify the latter circuit .
4.可以增加可配置数字处理模块， 包括可配置数字混频器， 可配置数字滤波器， 可配置 降采样， 使得最终输出的数字中频信号的中频频率、 带宽、 采样频率、 采样点比特数可设置， 以增加射频处理部分输出的灵活性， 最大限度的与数字基带处理部分的要求匹配。  4. Add configurable digital processing module, including configurable digital mixer, configurable digital filter, configurable downsampling, so that the IF frequency, bandwidth, sampling frequency, and sampling point number of the final output digital IF signal can be Set to increase the flexibility of the RF processing section output to best match the requirements of the digital baseband processing section.
5.可配置数字处理模块， 可以是前述中的一个或几个模块。  5. The configurable digital processing module can be one or more of the foregoing.
6.数据接口用于写入各种配置信息。  6. The data interface is used to write various configuration information.

Claims

权利要求书 Claim
1.导航卫星信号的可配置通用射频处理方法， 其特征在于包括以下步骤： 利用宽带低噪 声放大器对导航卫星射频信号进行放大， 宽带低噪声放大器的工作范围覆盖两种或两种以上 的导航卫星射频信号； 将放大的导航卫星射频信号与频率可设置的本地载波进行混频， 得到 中频信号。  A configurable general-purpose radio frequency processing method for a navigation satellite signal, comprising the steps of: amplifying a navigation satellite radio frequency signal by using a broadband low noise amplifier, the working range of the broadband low noise amplifier covering two or more navigation satellites Radio frequency signal; mixing the amplified navigation satellite radio frequency signal with a frequency-settable local carrier to obtain an intermediate frequency signal.
2.根据权利要求 1 所述的导航卫星信号的可配置通用射频处理方法， 其特征在于： 利用 可配置锁相环产生频率可设置的本地载波。  2. A configurable universal radio frequency processing method for a navigation satellite signal according to claim 1, wherein: a configurable phase locked loop is used to generate a frequency configurable local carrier.
3.根据权利要求 1 所述的导航卫星信号的可配置通用射频处理方法， 其特征在于： 所述 导航卫星射频信号的频率位于 l〜2GHz的范围内。  The configurable general-purpose radio frequency processing method for a navigation satellite signal according to claim 1, wherein: the frequency of the radio frequency signal of the navigation satellite is in a range of 1 to 2 GHz.
4.根据权利要求 1 所述的导航卫星信号的可配置通用射频处理方法， 其特征在于： 本地 载波的频率设置符合以下关系式： fIF= | fs-f。l， 其中 fIF为中频信号的中频频率， 为导航卫 星信号频率， f。为本地载波频率； 并且不同频率的导航卫星信号的 fs不同， 通过选择相应的 f。， 使得中频频率 fIF基本保持恒定。 4. The configurable universal radio frequency processing method for a navigation satellite signal according to claim 1, wherein: the frequency setting of the local carrier conforms to the following relationship: f IF = | f s -f. l, where f IF is the intermediate frequency of the intermediate frequency signal, which is the frequency of the navigation satellite signal, f. For the local carrier frequency; and the f s of the navigation satellite signals of different frequencies are different, by selecting the corresponding f. , so that the intermediate frequency f IF is kept substantially constant.
5.根据权利要求 1 所述的导航卫星信号的可配置通用射频处理方法， 其特征在于： 还包 括中频放大、 滤波、 增益控制放大和模数变换步骤， 在模数变换之后， 有选择地对数字中频 信号进行以下的一种或几种数字处理： 数字混频、 数字滤波、 数字降采样； 经过数字处理后， 数字中频信号的中频频率、 带宽、 采样率都可以被改变。  5. The configurable universal radio frequency processing method for a navigation satellite signal according to claim 1, further comprising: intermediate frequency amplification, filtering, gain control amplification, and analog to digital conversion steps, after the analog to digital conversion, selectively The digital intermediate frequency signal performs one or more of the following digital processing: digital mixing, digital filtering, digital downsampling; after digital processing, the intermediate frequency, bandwidth, and sampling rate of the digital intermediate frequency signal can be changed.
6.导航卫星信号的可配置通用射频处理系统， 包括混频器， 该混频器分别连接低噪声放 大器和锁相环， 其特征在于： 所述低噪声放大器为宽带低噪声放大器， 其工作范围覆盖两种 或两种以上的导航卫星射频信号； 所述锁相环为具有数据接口的可配置锁相环； 所述数据接 口用于写入配置信息， 所述可配置锁相环产生频率可设置的本地载波。  6. A configurable general-purpose RF processing system for navigating satellite signals, comprising a mixer, the mixer being respectively connected to a low noise amplifier and a phase locked loop, wherein: the low noise amplifier is a broadband low noise amplifier, and its working range Covering two or more navigation satellite radio frequency signals; the phase locked loop is a configurable phase locked loop having a data interface; the data interface is used to write configuration information, and the configurable phase locked loop generates a frequency Set the local carrier.
7.根据权利要求 6所述的导航卫星信号的可配置通用射频处理系统， 其特征在于： 所述 导航卫星射频信号的频率位于 l〜2GHz的范围内；可配置锁相环产生频率可设置的本地载波； 本地载波的频率设置符合以下关系式： fIF= | fs_f。|， 其中 fIF为中频信号的中频频率， fs为导 航卫星信号频率， f。为本地载波频率； 并且不同频率的导航卫星信号的 fs不同， 通过选择相 应的 f。， 使得中频频率 fIF基本保持恒定。 The configurable universal radio frequency processing system for Navigating satellite signals according to claim 6, wherein: the frequency of the radio frequency signal of the navigation satellite is in a range of 1 to 2 GHz; and the frequency of the phase-locked loop can be configured to be settable. Local carrier; The frequency setting of the local carrier conforms to the following relationship: f IF = | f s _f. |, where f IF is the intermediate frequency of the intermediate frequency signal and f s is the frequency of the navigation satellite signal, f. For the local carrier frequency; and the f s of the navigation satellite signals of different frequencies are different, by selecting the corresponding f. , so that the intermediate frequency f IF is kept substantially constant.
8.根据权利要求 6所述的导航卫星信号的可配置通用射频处理系统， 其特征在于： 还包 括顺序连接的中频放大器、 滤波器、 增益控制放大器和模数变换器， 所述中频放大器连接所 述混频器， 所述模数变换器与以下的一个或几个可配置数字处理模块相串联： 可配置数字混 频器， 可配置数字滤波器， 可配置降采样； 各种配置信息通过数据接口写入； 所述可配置降 采样输出数字中频信号。  8. The configurable universal radio frequency processing system for navigation satellite signals according to claim 6, further comprising: sequentially connected intermediate frequency amplifiers, filters, gain control amplifiers, and analog to digital converters, said intermediate frequency amplifier connection Mixer, the analog-to-digital converter is connected in series with one or several configurable digital processing modules: configurable digital mixer, configurable digital filter, configurable downsampling; various configuration information through data Interface write; the configurable downsampled output digital intermediate frequency signal.
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