CN102843178A - Spread spectrum relay measurement and control system compatible with standard unified S-band measurement and control system - Google Patents
Spread spectrum relay measurement and control system compatible with standard unified S-band measurement and control system Download PDFInfo
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Abstract
A spread spectrum relay measurement and control system compatible with a standard unified S-band measurement and control system comprises a radio-frequency (RF) receiving module, an RF transmitting module, a baseband module, a phase shift keying (PSK) module, an interface control module and a power supply module. The RF receiving module is used to achieve receiving and down-conversion of remote control signals, the RF transmitting module is used to achieve binary phase shift keying (BPSK) modulation and transmission of telemetry spread spectrum signals, the baseband module is used to achieve demodulation and despreading of the remote control signals and spreading of telemetry signals, the PSK module is used to achieve BPSK modulation of remote control code flow and demodulation of differential phase shift keying (DPSK) telemetry signals, the interface control module is used to carry out select output of remote control BPSK signals of the system or remote control BPSK signals of an answering machine system, and the power supply module is used to provide power for the RF receiving module, the RF transmitting module, the baseband module, the phase shift keying (PSK) module and the interface control module. By means of the spread spectrum relay measurement and control system compatible with the standard unified S-band measurement and control system, compatibility of the satellite standard unified S-band measurement and control system and the spread spectrum measurement and control system is achieved, and a spread spectrum relay measurement and control function can be achieved on a satellite with the standard unified S-band measurement and control system.
Description
Technical field
The present invention relates to a kind of compatibility standard and unify the spread spectrum relaying TT&C system of S-band observing and controlling system, be applicable to that the employing standard unifies the function that the satellite of S-band observing and controlling system is realized the observing and controlling of spread spectrum relaying.
Background technology
Relaying observing and controlling is a kind of relay repeater that utilizes on the geostationary satellite, realizes the communication system of remote control between ground based terminal and the user satellite, telemetry function.Utilize this technology can improve TT&C coverage, increase satellite in the rail observing and controlling time to medium and low earth orbit satellites.Relaying observing and controlling at present replenishes mainly as the observing and controlling of star ground, and the remote signal output through control relaying detection and control terminal realizes relaying observing and controlling function.
Spread spectrum observing and controlling system is the satellite observing and controlling system that develops rapidly in recent years.This technology adopts the pseudo-code spread processing, has plurality of advantages such as anti-interference, anti-intercepting and capturing.U.S. third generation TDRS system and domestic day chain relay satellite system all adopt the spread spectrum system, and ground based terminal, relaying detection and control terminal also are the spread spectrum design.
The system that standard is unified S-band observing and controlling system uses the PM modulator approach to carry out transmission of Information, and satellite adopts USB answering machine transmitting-receiving remote-control romote-sensing signal.This observing and controlling system has the maturity height, meets characteristics such as international standard, is the satellite communication system of present main flow, has very strong vitality.
At present, relaying observing and controlling is only used in the satellite that adopts spread spectrum observing and controlling system.This is because the satellite of this system adopts pseudo-code spread spectrum answering machine; Signaling interface between its remote control, remote measurement processing mode and platform device is consistent with existing relaying detection and control terminal: the remote signal of band spectrum modulation is accomplished demodulation and is synchronously generated the PCM sign indicating number in the back in pseudo-code spread spectrum answering machine (or relaying detection and control terminal), sends on the star RCU and carries out follow-up remote information and handle; Telemetered signal inputs to pseudo-code spread spectrum answering machine (or relaying detection and control terminal) with PCM sign indicating number form RCU from the star, after band spectrum modulation, exports; At pseudo-code spread spectrum answering machine lock-out state, forbid the remote information output of relaying detection and control terminal through answering machine bit synchronization high level; In the answering machine out-of-lock condition, allow the remote information output of relaying detection and control terminal through answering machine bit synchronization low level.
The USB answering machine has remarkable difference aspect the signaling interface between remote control, remote measurement processing mode and platform device: the USB answering machine is sent PSK remote control subcarrier signal, remote control carrier synchronization signal into RCU and is carried out follow-up remote information processing; Central computer is sent DPSK remote measurement subcarrier signal into the USB answering machine and is carried out PM modulation back emission on the star.Therefore, the satellite platform equipment that employing standard is unified S-band observing and controlling system can't compatiblely have the relaying TT&C system now.
Summary of the invention
The technical problem that the present invention solves: the deficiency that overcomes prior art; The spread spectrum relaying TT&C system that provides a kind of compatibility standard to unify S-band observing and controlling system; The employing standard being unified the user satellite platform device of S-band observing and controlling system changes on the minimum basis; It is compatible that the realization standard is unified the signaling interface of S-band observing and controlling system and spread spectrum observing and controlling system, unifies in standard to realize spread spectrum relaying observing and controlling function on the satellite of S-band observing and controlling system.
Technical solution of the present invention is:
A kind of compatibility standard is unified the spread spectrum relaying TT&C system of S-band observing and controlling system, comprises Receiver Module, radiofrequency emitting module, baseband module, PSK module, interface control module and power module, and power module is other module for power supply;
Receiver Module is realized the reception and the down-conversion of remote signal; Signal after the down-conversion is sent into baseband module; Baseband module carries out after the demodulation despreading to the signal of importing; Send in the PSK module, the PSK module carries out sending into interface control module after the BPSK modulation to input signal again, and the signal after interface control module is modulated BPSK and the remote control bpsk signal of outside transponder system output select to export to RCU on the star;
Central computer output remote measurement dpsk signal is given the PSK module on the star; The PSK module realizes the demodulation to the remote measurement dpsk signal; Afterwards the telemetered signal that generates is inputed to baseband module; Baseband module is realized the adding after the expansion of the telemetered signal of input inputed to radiofrequency emitting module, and radiofrequency emitting module is realized the BPSK modulation and emission to the remote measurement spread-spectrum signal;
Said Receiver Module comprises reception antenna, signal amplification circuit and lower frequency changer circuit; Reception antenna receives the remote signal of repeater satellite emission, carry out the amplification, Filtering Processing of signal through signal amplification circuit after, send into baseband module after the down-conversion output intermediate-freuqncy signal; Simultaneously, Receiver Module is that radiofrequency emitting module and baseband module provide reference clock signal.
Said radiofrequency emitting module comprises BPSK modulation circuit, signal amplification circuit and transmitting antenna; The remote measurement spread-spectrum signal that the BPSK modulation circuit is sent into baseband module carries out radio band BPSK modulation, after signal amplification circuit amplification, filtering, sends through transmitting antenna again.
Said baseband module comprises remote control baseband signal processing unit and remote measurement baseband signal processing unit; The reference clock that the remote control baseband signal processing unit utilizes Receiver Module to provide carries out catching and following the tracks of of carrier wave and pseudo-code to the intermediate-freuqncy signal of Receiver Module output; Accomplish the demodulation and the decoding of remote-control data; And will decipher output, send into the BPSK modulation that the PSK module is carried out remote information according to the timing waveform of clock, gate and the three-way signal of data; The remote measurement baseband signal processing unit carries out convolutional encoding and band spectrum modulation with the remote measurement PCM sign indicating number of PSK module output, the remote measurement spread-spectrum signal is sent into radiofrequency emitting module handle.
Said PSK module comprises remote control BPSK modulating unit and remote measurement DPSK demodulating unit; Remote control BPSK modulating unit receives the output signal from baseband module, this output signal is carried out sending into interface control module after PSK modulates select output;
Remote measurement DPSK demodulating unit receives the remote measurement dpsk signal of central computer output on the star, accomplish the signal demodulation after, the remote measurement baseband signal processing unit that the remote measurement PCM sign indicating number that obtains and clock signal are delivered to baseband module is encoded and spread processing.
Beneficial effect of the present invention:
(1) the present invention makes relaying observing and controlling function unify in standard to be achieved on the satellite of S-band observing and controlling system, and has inherited ripe spread spectrum system relaying detection and control terminal design to greatest extent, and the functions of modules of increase is independent, is convenient to combination and design separately;
(2) the present invention does not do any change to the relevant stand-alone device of satellite platform that standard is unified S-band observing and controlling system; Only need suitably to revise whole star cable system; Can the realization standard unify the spread spectrum relaying observing and controlling function under the S-band observing and controlling system, greatly reduce development cost and change risk.
Description of drawings
Fig. 1 is a system architecture sketch map of the present invention;
Fig. 2 is Receiver Module of the present invention and radio frequency output module signal processing flow graph;
Fig. 3 catches flow chart for remote signal of the present invention;
Fig. 4 is the tracking processing flow graph of remote signal of the present invention;
Fig. 5 is a synchronous indicating signal flow graph of the present invention;
Fig. 6 is a telemetered signal flow graph of the present invention.
Fig. 7 is a dpsk signal demodulation flow graph of the present invention;
Fig. 8 is an interface control module sketch map of the present invention;
Embodiment
Further describe in detail below in conjunction with the accompanying drawing specific embodiments of the invention.
The invention provides a kind of compatibility standard and unify the spread spectrum relaying TT&C system of S-band observing and controlling system, be used for adopting standard to unify the satellite of S-band observing and controlling system, realize the function of spread spectrum relaying observing and controlling.Be illustrated in figure 1 as system of the present invention and form, mainly form: Receiver Module, radiofrequency emitting module, baseband module, PSK module, interface control module and power module by following module; Receiver Module is realized the reception and the down-conversion of remote signal; Radiofrequency emitting module is realized the BPSK modulation and emission of remote measurement spread-spectrum signal; Baseband module realize remote signal demodulation despreading and telemetered signal add expansion; The PSK module realizes the BPSK modulation of remote control code stream and the demodulation of remote measurement dpsk signal; Interface control module is selected output to native system remote control bpsk signal or transponder system remote control bpsk signal; Power module is above-mentioned each module for power supply.
The course of work is: Receiver Module is realized the reception and the down-conversion of remote signal; Signal after the down-conversion is sent into baseband module; Baseband module carries out after the demodulation despreading to the signal of importing; Send in the PSK module, the PSK module carries out sending into interface control module after the BPSK modulation to input signal again, and the signal after interface control module is modulated BPSK and the remote control bpsk signal of outside transponder system output select to export to RCU on the star;
Central computer output remote measurement dpsk signal is given the PSK module on the star; The PSK module realizes the demodulation to the remote measurement dpsk signal; Afterwards the telemetered signal that generates is inputed to baseband module; Baseband module is realized the adding after the expansion of the telemetered signal of input inputed to radiofrequency emitting module, and radiofrequency emitting module is realized the BPSK modulation and emission to the remote measurement spread-spectrum signal;
Among the present invention, Receiver Module comprises reception antenna, signal amplification circuit and lower frequency changer circuit.The signal processing flow graph of Receiver Module and radiofrequency emitting module is seen shown in Figure 2.Reception antenna receives the remote control spread-spectrum signal that repeater satellite is transmitted, and inputs to the low noise amplification that the rear end LNA carries out small-signal through radio frequency cable.The receiver module constant-temperature crystal oscillator generates radiofrequency signal through local local oscillation circuit; S-band remote signal mixing with LNA output; Obtain the intermediate-freuqncy signal of 66.5MHz, accomplish the down-converted of signal, send into the despread-and-demodulation that baseband module carries out the intermediate frequency remote signal.
Radiofrequency emitting module comprises BPSK modulation circuit, signal amplification circuit and transmitting antenna.Remote measurement signal bit stream through after the spread processing inputs to the BPSK modulation circuit by baseband module; Radiofrequency emitting module carries out the BPSK modulation treatment to the remote measurement spread-spectrum signal after receiver module constant-temperature crystal oscillator signal is the S-band carrier signal through local local oscillation circuit frequency multiplication.Through amplification, Filtering Processing, through transmitting antenna the spread spectrum telemetered signal is emitted to repeater satellite and transmits subsequently, thus the relay satellite system of adaptation spread spectrum system.
Baseband module comprises remote control baseband signal processing unit, remote measurement baseband signal processing unit two parts.Hardware designs mainly comprise signal processing FPGA (Xilinx, XQR2V3000), base band configuration management FPGA (Actel, A54SX72A), configuring chip ROM/FLASH, ADC and DAC etc.
The 66.5MHz intermediate-freuqncy signal of remote control baseband signal processing unit received RF receiver module output; After the AD sampling; In signal processing FPGA, carry out catching fast and following the tracks of of carrier wave and pseudo-code, digital signal processings such as completion bit is synchronous, demodulation, Viterbi decoding.
Be illustrated in figure 3 as remote signal and catch flow chart.Carrier wave and acquiring pseudo code are the search procedures of a two dimension.In order to catch upward signal, need reappear the pseudo-code and the carrier wave of remote signal simultaneously.Adopt FFT to catch soon and realize the frequency axial scan, frequency axis scanning increment is chosen Doppler frequency shift peaked 1/720; The mode of taking 1/2 chip serial to move is carried out the pseudo-code phase search.In search procedure, I and Q two paths of signals after Digital Down Convert and PN sign indicating number peeled off carry out integration and add up, the mould side value I of signal calculated
2+ Q
2, and each mould side's value and the thresholding of setting compared, to determine whether to satisfy harvesting policy, the carrier wave that finally estimates expectation with code phase values completion catch.
Be illustrated in figure 4 as the tracking processing flow graph of remote signal.After judging that trapped state is accomplished, on the basis of pseudo-code phase predicted value of catching and pseudo-Doppler frequency predicted value, carry out the tracking of pseudo-code phase tracking, carrier track and data bit.Carry out Viterbi decoding behind the baseband module data bit tracking lock, and will decipher output and send into the PSK modulation that the PSK module is carried out remote information according to the timing waveform of 8KHz remote control clock, bit synchronization signal and the three-way signal of remote control PCM sign indicating number.
Be illustrated in figure 5 as the processing flow graph of telemetered signal.The remote measurement baseband signal processing unit receives the remote measurement PCM sign indicating number and the clock signal of PSK module output, in signal processing FPGA, accomplishes the band spectrum modulation and the pulse shaping of telemetry, through the BPSK modulation that takes remote measurement of input radio frequency transmitter module after the DA conversion.
Base band configuration FPGA is configured management to base band signal process FPGA, accomplishes the global configuration of base band signal process FPGA.Base band configuration FPGA and base band signal process FPGA clock are provided by Receiver Module output clock source; Base band signal process FPGA converts this clock the output of to LVPECL level; As the change over clock of AD, and 4 times of pseudo-bit rate clocks that inner NCO is produced offer DA as change over clock.
The PSK module comprises remote control BPSK modulating unit and remote measurement DPSK demodulating unit two parts.Remote control BPSK modulating unit receives remote control PCM sign indicating number, 8KHz clock signal and the bit synchronization signal from baseband module, and the remote control pcm stream is carried out the BPSK modulation.The 8KHz clock signal is through second-order bandpass filter and analog inverter; Form the sine wave signal and back (π phase place) sine wave signal thereof of same frequency behind filtering interfering and the noise; Remote control PCM sign indicating number forms bpsk signal through trigger control analog switch, and sending into interface control module has the new output of selection; Simultaneously, give interface control module with the bit synchronization signal transparent forwarding.Shown in Figure 6 is that bpsk signal is modulated flow graph.Remote measurement DPSK demodulating unit receives the remote measurement dpsk signal of central computer output on the star; With square around-France extraction 65.536KHz carrier signal; Produce the DPCM sign indicating number through sample circuit; Carry out differential conversion and generate the PCM sign indicating number, send into the baseband module signal spread-spectrum processing that takes remote measurement with the sign indicating number clock signal of extracting.Shown in Figure 7 is dpsk signal demodulation flow graph.
As shown in Figure 8; Interface module is exported to RCU through non-magnetic latching relay with the native system remote control bpsk signal (and bit synchronization signal) and the alternative of transponder system remote control bpsk signal (and carrier synchronization signal), thus the signal input interface of RCU on the compatible star.The control signal of relay is controlled by transponder system carrier synchronization signal, and when this signal was high level, the relay switch tangential was consistent with Fig. 8, and output transponder system remote control bpsk signal and carrier synchronization signal are sent into RCU on the star; When single this signal was low level, relay switch tangential and Fig. 8 were reverse, selected output native system bpsk signal and bit synchronization signal.
The unspecified part of the present invention belongs to general knowledge as well known to those skilled in the art.
Claims (5)
1. a compatibility standard is unified the spread spectrum relaying TT&C system of S-band observing and controlling system, it is characterized in that comprising Receiver Module, radiofrequency emitting module, baseband module, PSK module, interface control module and power module, and power module is other module for power supply;
Receiver Module is realized the reception and the down-conversion of remote signal; Signal after the down-conversion is sent into baseband module; Baseband module carries out after the demodulation despreading to the signal of importing; Send in the PSK module, the PSK module carries out sending into interface control module after the BPSK modulation to input signal again, and the signal after interface control module is modulated BPSK and the remote control bpsk signal of outside transponder system output select to export to RCU on the star;
Central computer output remote measurement dpsk signal is given the PSK module on the star; The PSK module realizes the demodulation to the remote measurement dpsk signal; Afterwards the telemetered signal that generates is inputed to baseband module; Baseband module is realized the adding after the expansion of the telemetered signal of input inputed to radiofrequency emitting module, and radiofrequency emitting module is realized the BPSK modulation and emission to the remote measurement spread-spectrum signal.
2. a kind of compatibility standard according to claim 1 is unified the spread spectrum relaying TT&C system of S-band observing and controlling system, it is characterized in that:
Said Receiver Module comprises reception antenna, signal amplification circuit and lower frequency changer circuit; Reception antenna receives the remote signal of repeater satellite emission, carry out the amplification, Filtering Processing of signal through signal amplification circuit after, send into baseband module after the down-conversion output intermediate-freuqncy signal; Simultaneously, Receiver Module is that radiofrequency emitting module and baseband module provide reference clock signal.
3. a kind of compatibility standard according to claim 1 is unified the spread spectrum relaying TT&C system of S-band observing and controlling system, it is characterized in that:
Said radiofrequency emitting module comprises BPSK modulation circuit, signal amplification circuit and transmitting antenna; The remote measurement spread-spectrum signal that the BPSK modulation circuit is sent into baseband module carries out radio band BPSK modulation, after signal amplification circuit amplification, filtering, sends through transmitting antenna again.
4. a kind of compatibility standard according to claim 1 is unified the spread spectrum relaying TT&C system of S-band observing and controlling system, it is characterized in that:
Said baseband module comprises remote control baseband signal processing unit and remote measurement baseband signal processing unit; The reference clock that the remote control baseband signal processing unit utilizes Receiver Module to provide carries out catching and following the tracks of of carrier wave and pseudo-code to the intermediate-freuqncy signal of Receiver Module output; Accomplish the demodulation and the decoding of remote-control data; And will decipher output, send into the BPSK modulation that the PSK module is carried out remote information according to the timing waveform of clock, gate and the three-way signal of data; The remote measurement baseband signal processing unit carries out convolutional encoding and band spectrum modulation with the remote measurement PCM sign indicating number of PSK module output, the remote measurement spread-spectrum signal is sent into radiofrequency emitting module handle.
5. a kind of compatibility standard according to claim 1 is unified the spread spectrum relaying TT&C system of S-band observing and controlling system, it is characterized in that:
Said PSK module comprises remote control BPSK modulating unit and remote measurement DPSK demodulating unit; Remote control BPSK modulating unit receives the output signal from baseband module, this output signal is carried out sending into interface control module after PSK modulates select output;
Remote measurement DPSK demodulating unit receives the remote measurement dpsk signal of central computer output on the star, accomplish the signal demodulation after, the remote measurement baseband signal processing unit that the remote measurement PCM sign indicating number that obtains and clock signal are delivered to baseband module is encoded and spread processing.
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| CN109286429A (en) * | 2018-08-01 | 2019-01-29 | 北京邮电大学 | Base station and its multiple-input and multiple-output receiving end based on π phase |
| CN110138406A (en) * | 2019-04-30 | 2019-08-16 | 西安思丹德信息技术有限公司 | Point to multi--point target drone data link system and its signal processing method |
| CN111478726A (en) * | 2020-05-27 | 2020-07-31 | 中国科学院微小卫星创新研究院 | Communication system for small communication satellite |
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| CN114301511B (en) * | 2021-12-08 | 2024-04-16 | 北京微纳星空科技有限公司 | Processing method, equipment and storage medium for high-speed uploading data |
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| CN105915264A (en) * | 2016-05-20 | 2016-08-31 | 中国电子科技集团公司第十研究所 | SMA link double spreading code signal multiplexing method |
| CN107528629A (en) * | 2017-09-30 | 2017-12-29 | 湖南迈克森伟电子科技有限公司 | Satellite TT number passes broadcast integrated communication system |
| CN107528629B (en) * | 2017-09-30 | 2024-01-30 | 湖南迈克森伟电子科技有限公司 | Satellite measurement and control data transmission broadcast integrated communication system |
| CN109286429A (en) * | 2018-08-01 | 2019-01-29 | 北京邮电大学 | Base station and its multiple-input and multiple-output receiving end based on π phase |
| CN110138406A (en) * | 2019-04-30 | 2019-08-16 | 西安思丹德信息技术有限公司 | Point to multi--point target drone data link system and its signal processing method |
| CN111478726A (en) * | 2020-05-27 | 2020-07-31 | 中国科学院微小卫星创新研究院 | Communication system for small communication satellite |
| CN112187339A (en) * | 2020-09-27 | 2021-01-05 | 山东航天电子技术研究所 | Measure communication integration sky base measurement and control terminal |
| CN114301511A (en) * | 2021-12-08 | 2022-04-08 | 北京微纳星空科技有限公司 | Processing method and device for high-speed uploading data and storage medium |
| CN114301511B (en) * | 2021-12-08 | 2024-04-16 | 北京微纳星空科技有限公司 | Processing method, equipment and storage medium for high-speed uploading data |
| CN114710192A (en) * | 2022-03-11 | 2022-07-05 | 中国科学院国家空间科学中心 | Satellite-borne heaven-sea relay communication system and method applied to low-earth satellite |
| CN114710192B (en) * | 2022-03-11 | 2023-11-17 | 中国科学院国家空间科学中心 | Satellite-borne space-sea relay communication system and method applied to low-orbit satellite |
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