CN103905015B - A kind of wireless low jitter transmission method of high accuracy number asynchronous pulse - Google Patents
A kind of wireless low jitter transmission method of high accuracy number asynchronous pulse Download PDFInfo
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Abstract
The present invention relates to a kind of wireless low jitter transmission method of the high accuracy number asynchronous pulse in the pulse wireless transmission communications field, is particularly well-suited to the wireless low jitter transmission of radar pulse.Shaping pulse is carried out in originator, time difference between the rising edge or trailing edge of asynchronous pulse signal and local clock after shaping pulse is converted into by digital signal using time figure modular converter, the steps such as digital sample, coding and modulation are then carried out to digital signal；In receiving end using modules such as Timing error estimate, loop filtering, numerical control NCO, interpolation filterings, local clock precision is improved, on the premise of bandwidth is not sacrificed, reduce output impulse phase error, the high-precision low jitter pulse signal of final output.The present invention adopts totally digitilized processing mode, without the need for local synchronous clock, it becomes possible to reach high-precision asynchronous low jitter pulse laser propagation effect.Main circuit parts adopt FPGA or ASIC to realize, design, debugging difficulty are low.
Description
Technical field
The present invention relates to a kind of wireless low jitter of the high accuracy number asynchronous pulse in the pulse wireless transmission communications field
Transmission method, is particularly well-suited to the wireless low jitter transmission of radar pulse.
Background technology
Conventional pulse digital sampling wireless transmission method, can accurately judge having for pulse signal in receiving terminal
Nothing, but the shake of the rising edge of the pulse signal for receiving, trailing edge is larger.Reduce along shake, it is necessary to when improving sampling
Clock frequency, so as to improve the sample rate to pulse.If to the requirement as little as nanosecond along shake, required clock frequency is high
Up to 1GHz even more highs.Under current technical conditions, this is difficult to.Existing synchronous low jitter transmission method, its
The low jitter transmission of pulse will be with a width of cost of sacrificial system band；Pulse edge and clock can only be processed along synchronous feelings in transmitting terminal
Shape, causes which in radar pulse transmission using limited；And reduced along shake, system using analog phase-locked loop circuit in receiving terminal
Debugging is wasted time and energy, and the lifting of precision is limited.
The content of the invention
The technical problem to be solved is to avoid the weak point in above-mentioned background and provide a kind of based on different
The high-precision pulse digital radio low jitter transmission method of step clock, on the premise of bandwidth is not sacrificed, reduces output pulse
Phase error, the high-precision low jitter pulse signal of final output.In transmitting terminal, radar pulse is passed through into the time with local clock
Time difference of the radar pulse with local clock rising edge or trailing edge is converted into digital signal by data-converting block, then complete
The modulation transmissions of the paired signal.In receiving terminal, using Timing error estimate module, loop filtering module, numerical control NCO modules,
Interpolation filtering module etc., using feedback loop design, improves local clock precision, so as to the low jitter for realizing pulse is transmitted.This
The main circuit parts sampling FPGA or ASIC of inventive method realizes that concordance is good, and debugging difficulty is low, easily realizes pulse jitter
Being wirelessly transferred less than 3ns.
The object of the present invention is achieved like this, and it includes step：
Transmitting terminal：
1) input asynchronous pulse signal is carried out into shaping pulse, realizes the pulse deformation correction in Wireline transmission；
2) using time figure modular converter by the rising edge of the asynchronous pulse signal after shaping pulse and local clock or
Time difference between trailing edge is converted into digital signal；
3) to step 2）The digital signal of generation carries out impulse sampling, coding and modulates, and forms digital modulation signals, numeral
Include pulse information and time difference information in modulated signal；
4) D/A switch is carried out to digital modulation signals, is converted to modulated-analog signal；
5) radio frequency unit carries out up-conversion and power amplification to modulated-analog signal, is converted to high-frequency signal, and by high frequency
Signal sends into wireless channel by antenna；
Receiving terminal：
6) radio frequency unit receives the high-frequency signal in wireless channel by antenna, and high-frequency signal is carried out low noise puts
Greatly, down coversion and AGC are converted to simulation zero intermediate frequency signals after amplifying；
7) analog/digital conversion is carried out to simulating zero intermediate frequency signals, be converted to digital zero intermediate frequency signals；
8) the optimal sampling position that fed back according to numerical control NCO units is fractional spaced and basic point of interpolation, in digital zero
The sampled value of frequency signal carries out digital interpolation；
9) matched filtering is carried out to the baseband signal after digital interpolation；
10) carrier auxiliary is carried out to the signal after matched filtering, for the frequency deviation that thermal compensation signal is produced in transmitting procedure
And skew；
11) time domain waveform of signal after carrier auxiliary is made decisions, afterwards, while proceeding to step 12）With step 15）；
12) according to step 11）The court verdict information for obtaining, using Gardner algorithms, estimates signal after carrier auxiliary
Timing error information；
13) timing error information for estimating is filtered into noise by loop filtering module；
14) to calculate optimal sampling position according to the timing error information for estimating fractional spaced and interior for numerical control NCO units
Slotting basic point, proceeds to step 8）；
15) to step 11）The court verdict information for obtaining enters row decoding matching；
16) arteries and veins is carried out according to the signal after the fractional spaced matching to decoding in optimal sampling position of numerical control NCO units offer
Punching recovers, and exports the asynchronous pulse signal of low jitter；
Complete the wireless low jitter transmission of high accuracy number asynchronous pulse.
The present invention is had the advantage that compared with background technology：
1st, the wireless low jitter transmission method of high accuracy number asynchronous pulse proposed by the present invention, with conventional lock-out pulse
Wireless low jitter transmission is compared, and more meets practical application request, and processing accuracy is higher, realizes and debug more simple and fast, and
Not with a width of cost of sacrificial system band.Existing lock-out pulse wireless low jitter transmission method can only process originator pulse edge and
Along synchronous situation, this is the practical application for not meeting radar pulse transmission to clock, causes which to answer in radar pulse transmission
With limited；Existing lock-out pulse wireless low jitter transmission method is reduced along shake using analog phase-locked loop circuit in receiving terminal
Mode, due in conventional analog circuits time delay length and lockin signal between the low shortcoming of precision, not only system debug expense
When it is laborious and limited for the lifting that timing accuracy is transmitted in pulse；Existing lock-out pulse wireless low jitter transmission method, its
The low jitter transmission of pulse is needed with spread bandwidth as cost, causes the waste of system resource.High accuracy proposed by the present invention
The wireless low jitter transmission method of Digital Asynchronous pulse, provides the synchronised clock for producing pulse without the need for system, will to system clock
Ask not high, reduce the design difficulty of modulation /demodulation, system bandwidth need not be extended, realize the total digitalization design of system, be
System processing accuracy is higher, is more easy to debugging.
2nd, the main circuit parts of the inventive method adopt FPGA or ASIC to realize, concordance is good, easily realizes that pulse is trembled
Dynamic being wirelessly transferred less than 3ns.
Description of the drawings
Fig. 1 is that the present invention has electric functional-block diagram of the line side signal to wireless side inter-process embodiment.
Fig. 2 is wireless side signal of the present invention to the electric functional-block diagram for having line side inter-process embodiment.
In Fig. 11 be shaping pulse module, 2 be time figure conversion module, 3 be impulse sampling, coding, modulation module, 4
For D A switch module, 5 is radio frequency unit module.Wherein time figure conversion module is typically by devices such as trigger, amplifiers
Composition, impulse sampling, coding, modulation module are typically made up of FPGA or ASIC, and radio frequency unit module generally comprises local oscillator, I/Q
The parts such as manipulator, upconverter, power amplifier, antenna.
In Fig. 2,6 is radio frequency unit module, and 7 is analog/digital conversion module, and 8 is interpolation filtering module, and 9 is matched filtering mould
Block, 10 is carrier recovery block, and 11 is information judging module, and 12 is Timing error estimate module, and 13 is loop filtering module, 14
For numerical control NCO modules, 15 are decoding matching module, and 16 is pulse-recovery module.Wherein radio frequency unit module generally comprise antenna,
The parts such as low-noise amplifier, low-converter, AGC, i/q demodulator, local oscillator.
Specific embodiment
Referring to figs. 1 to Fig. 2.Fig. 1 is that the present invention has electric principle square frame of the line side signal to wireless side inter-process embodiment
Figure, it includes shaping pulse module 1, time figure modular converter 2, impulse sampling, coding, modulation module 3, D/A switch mould
Block 4, radio frequency unit module 5；Wherein shaping pulse module 1, time figure modular converter 2, impulse sampling, coding, modulation module
3, D A switch module 4 constitutes modulating unit.Shaping pulse module 1 completes the pulse deformation correction in Wireline transmission；When
Between data-converting block 2 by the time between the rising edge or trailing edge of asynchronous pulse signal and local clock after shaping pulse
Difference is converted into digital signal；Impulse sampling, coding, modulation module 3 are to step 2）The digital signal of generation carries out impulse sampling, compiles
Code and modulation, generate the digital modulation signals comprising pulse information and time difference information；D A switch module 4 is to digital modulation
Signal carries out D/A switch, is converted to modulated-analog signal；Modulated-analog signal is transformed to radio frequency by radio frequency unit module 5
Signal is entered and is wirelessly transferred.
Fig. 2 be wireless side signal of the present invention to the electric functional-block diagram for having line side inter-process embodiment, it includes radio frequency
Unit module 6, analog/digital conversion module 7, interpolation filtering module 8, matched filtering module 9, carrier recovery block 10, information judgement
Module 11, Timing error estimate module 12, loop filtering module 13, numerical control NCO modules 14 decode matching module 15, and pulse is extensive
Multiple module 16；Wherein analog/digital conversion module 7, interpolation filtering module 8, matched filtering module 9, carrier recovery block 10, information is sentenced
Certainly module 11, Timing error estimate module 12, loop filtering module 13, numerical control NCO modules 14, decode matching module 15, pulse
Recovery module 16 constitutes demodulating unit.The radiofrequency signal being wirelessly transferred is transformed to simulate zero intermediate frequency signals by radio frequency unit module 6；
Simulation zero intermediate frequency signals enter analog/digital conversion module 7, are converted to digital zero intermediate frequency signals；Using interpolation filtering module 8, logarithm
The sampled value of word zero intermediate frequency signals carries out digital interpolation, by Timing error estimate module 12, loop filtering module 13, numerical control
The feedback circuit that NCO modules 14 are constituted obtains that optimal sampling position is fractional spaced and basic point of interpolation, for interpolation filter module and
Pulse-recovery module is used, then through matched filtering module 9, carrier recovery block 10, and information judging module 11, decoding matching
Module 15, pulse-recovery module 16 complete digital demodulation, decoding, pulse-recovery；The asynchronous pulse signal of final output low jitter.
The signal transmission of technical solution of the present invention is carried out according to the following steps：
Transmitting terminal：
1) input asynchronous pulse signal is carried out into shaping pulse, realizes the pulse deformation correction in Wireline transmission, it is real
Example is applied by the pulse shaping module 1 in Fig. 1 to complete；
2) using time figure modular converter by the rising edge of the asynchronous pulse signal after shaping pulse and local clock or
Time difference between trailing edge is converted into digital signal, and embodiment is completed by the time figure modular converter 2 in Fig. 1；
3) to step 2）The digital signal of generation carries out impulse sampling, coding and modulates, and forms digital modulation signals；Numeral
Include pulse information and time difference information in modulated signal, embodiment is by the impulse sampling in Fig. 1, coding, modulation module 3
Complete；
4) D/A switch is carried out to digital modulation signals, is converted to modulated-analog signal, embodiment is by the D/A in Fig. 1
Modular converter 4 is completing；
5) radio frequency unit carries out up-conversion and power amplification to modulated-analog signal, is converted to high-frequency signal, and by high frequency
Signal sends into wireless channel by antenna, and embodiment is completed by the radio frequency unit module 5 in Fig. 1；
Receiving terminal：
6) radio frequency unit receives the high-frequency signal in wireless channel by antenna, and high-frequency signal is carried out low noise puts
Greatly, down coversion and AGC are converted to simulation zero intermediate frequency signals after amplifying, and embodiment is completed by the radio frequency unit module 6 in Fig. 2；
7) analog/digital conversion being carried out to simulating zero intermediate frequency signals, being converted to digital zero intermediate frequency signals, embodiment is by Fig. 2
Analog/digital conversion module 7 is completing；
8) the optimal sampling position that fed back according to numerical control NCO units is fractional spaced and basic point of interpolation, in digital zero
The sampled value of frequency signal carries out digital interpolation, and embodiment is completed by the interpolation filtering module 8 in Fig. 2；
9) matched filtering is carried out to the baseband signal after digital interpolation, embodiment is complete by the matched filtering module 9 in Fig. 2
Into；
10) carrier auxiliary is carried out to the signal after matched filtering, for the frequency deviation that thermal compensation signal is produced in transmitting procedure
And skew, embodiment completed by the carrier recovery block 10 in Fig. 2；
11) time domain waveform of signal after carrier auxiliary is made decisions；Afterwards, while proceeding to step 12）With step 15）,
Embodiment is completed by the information judging module 11 in Fig. 2；
12) according to step 11）The court verdict information for obtaining, using Gardner algorithms, estimates signal after carrier auxiliary
Timing error information, embodiment completed by the Timing error estimate module 12 in Fig. 2；
13) timing error information for estimating is filtered into noise by loop filtering module, embodiment is by the loop in Fig. 2
Filtration module 13 is completing；
14) to calculate optimal sampling position according to the timing error information for estimating fractional spaced and interior for numerical control NCO units
Slotting basic point；Proceed to step 8）, embodiment completed by the numerical control NCO modules 14 in Fig. 2；
15) to step 11）The court verdict information for obtaining enters row decoding matching, and embodiment is by the decoding matching mould in Fig. 2
Block 15 is completing；
16) arteries and veins is carried out according to the signal after the fractional spaced matching to decoding in optimal sampling position of numerical control NCO units offer
Punching recovers, and exports the asynchronous pulse signal of low jitter, and embodiment is completed by the pulse-recovery module 16 in Fig. 2.
Claims (1)
1. a kind of wireless low jitter transmission method of high accuracy number asynchronous pulse, it is characterised in that including step：
Transmitting terminal：
1) input asynchronous pulse signal is carried out into shaping pulse, realizes the pulse deformation correction in Wireline transmission；
2) using time figure modular converter by the rising edge of the asynchronous pulse signal after shaping pulse and local clock or decline
Time difference between is converted into digital signal；
3) to step 2) digital signal that generates carries out impulse sampling, coding and modulates, and forms digital modulation signals；Digital modulation
Include pulse information and time difference information in signal；
4) D/A switch is carried out to digital modulation signals, is converted to modulated-analog signal；
5) radio frequency unit carries out up-conversion and power amplification to modulated-analog signal, is converted to high-frequency signal, and by high-frequency signal
Wireless channel is sent into by antenna；
Receiving terminal：
6) radio frequency unit by antenna receive wireless channel in high-frequency signal, and by high-frequency signal carry out low noise amplification, under
Frequency conversion and AGC are converted to simulation zero intermediate frequency signals after amplifying；
7) analog/digital conversion is carried out to simulating zero intermediate frequency signals, be converted to digital zero intermediate frequency signals；
8) the optimal sampling position that fed back according to numerical control NCO units is fractional spaced and basic point of interpolation, and digital zero intermediate frequency is believed
Number sampled value carry out digital interpolation；
9) matched filtering is carried out to the baseband signal after digital interpolation；
10) carrier auxiliary is carried out to the signal after matched filtering, the frequency deviation produced in transmitting procedure for thermal compensation signal and phase
Partially；
11) time domain waveform of signal after carrier auxiliary is made decisions；Afterwards, while proceeding to step 12) and step 15)；
12) according to step 11) the court verdict information that obtains, using Gardner algorithms, after estimating carrier auxiliary, signal determines
Time error information；
13) timing error information for estimating is filtered into noise by loop filtering module；
14) numerical control NCO units calculate according to the timing error information for estimating that optimal sampling position is fractional spaced and interpolation base
Point；Proceed to step 8)；
15) to step 11) the court verdict information that obtains enters row decoding matching；
16) horizontal pulse is entered according to the signal after the fractional spaced matching to decoding in optimal sampling position of numerical control NCO units offer extensive
It is multiple, export the asynchronous pulse signal of low jitter；
Complete the wireless low jitter transmission of high accuracy number asynchronous pulse.
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| CN201410150428.4A CN103905015B (en) | 2014-04-15 | 2014-04-15 | A kind of wireless low jitter transmission method of high accuracy number asynchronous pulse |
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| WO2017214226A1 (en) * | 2016-06-10 | 2017-12-14 | At&T Intellectual Property I, L.P. | Method and apparatus for use with a radio distributed antenna system having an in-band reference signal |
| CN111371450B (en) * | 2020-03-20 | 2022-12-09 | 中国电子科技集团公司第五十四研究所 | High-precision low-jitter clock recovery system |
| CN111896078B (en) * | 2020-07-09 | 2022-05-13 | 合肥联睿微电子科技有限公司 | Bluetooth communication-based meter calibration method |
| CN114301552B (en) * | 2022-01-06 | 2023-09-26 | 中电科思仪科技股份有限公司 | Digital modulation signal testing method and system |
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| US5710517A (en) * | 1995-08-01 | 1998-01-20 | Schlumberger Technologies, Inc. | Accurate alignment of clocks in mixed-signal tester |
| CN102684653A (en) * | 2012-05-29 | 2012-09-19 | 中国电子科技集团公司第五十四研究所 | Digital synchronous pulse wireless low-jitter transmission method |
| CN102820872A (en) * | 2012-08-27 | 2012-12-12 | 中国电子科技集团公司第五十四研究所 | Wireless low-jitter transmission method for digital asynchronous pulse |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US5710517A (en) * | 1995-08-01 | 1998-01-20 | Schlumberger Technologies, Inc. | Accurate alignment of clocks in mixed-signal tester |
| CN102684653A (en) * | 2012-05-29 | 2012-09-19 | 中国电子科技集团公司第五十四研究所 | Digital synchronous pulse wireless low-jitter transmission method |
| CN102820872A (en) * | 2012-08-27 | 2012-12-12 | 中国电子科技集团公司第五十四研究所 | Wireless low-jitter transmission method for digital asynchronous pulse |
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| 高速数传系统中匹配滤波及定时同步算法改进及实现研究;翟海涛;《中国优秀硕士学位论文全文数据库 信息科技辑》;20111215(第S2期);第1-8,10-13,17-19,30-43页 * |
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