CN106849994A - A kind of Frequency Hopping Signal polarity diversity merging method - Google Patents

A kind of Frequency Hopping Signal polarity diversity merging method Download PDF

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CN106849994A
CN106849994A CN201611141008.5A CN201611141008A CN106849994A CN 106849994 A CN106849994 A CN 106849994A CN 201611141008 A CN201611141008 A CN 201611141008A CN 106849994 A CN106849994 A CN 106849994A
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signal
handed
frequency
frequency hopping
branch road
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CN106849994B (en
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顾嘉辉
王乐
唐硕
胡秘
唐文照
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Xian Institute of Space Radio Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7097—Interference-related aspects
    • H04B1/711—Interference-related aspects the interference being multi-path interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/715—Interference-related aspects

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

A kind of diversity combining method of Frequency Hopping Signal of the present invention, carries out AD samplings respectively by the signal that left-right rotary poliarizing antenna is received first, by obtaining two-way baseband signal after Digital Down Convert；Then to left and right rotation baseband signal conjugate multiplication, the frequency deviation and skew estimate that left-handed baseband signal is obtained after FFT are done, amendment deviation completes the open loop correction of left-handed branch road.Merging is finally weighted to the baseband signal after correction, the polarity diversity for completing Frequency Hopping Signal merges.The present invention proposes a kind of Frequency Hopping Signal polarity diversity merging treatment method, with the frequency deviation and skew of the mode real-time processing two paths of signals of opened loop control, relative to close-loop control mode, with the advantage such as simple structure, processing speed be fast, it is especially suitable for realizing the reception of frequency hopping telemetered signal, to reach best transmission signal to noise ratio.

Description

A kind of Frequency Hopping Signal polarity diversity merging method
Technical field
The present invention relates to telemetry communication field, more particularly to a kind of Frequency Hopping Signal polarity diversity merging method.
Background technology
Telemetry system is indispensable important component in ballistic missile system, is developed in the ballistic missile life-cycle During, telemetry system is used to obtain the working status parameter and environmental data of each system in flight test, elastic to determine Accident analysis or can be carried out foundation is provided.
In Missile Telemetry System, radio channel is played on bullet between Telemetry Data Acquisition device and Data Processing Ground Station Information transfer effect, mutually pass the bridge of communication as guided missile and ground hair control command system information, on the one hand telemetry system needs There is very low when ductility, on the one hand need that there is very strong robustness, i.e. transmission reliability.Particularly complex adaptability is cloudy My god, in the complicated geographical environment and dynamic electromagnetic environment such as cloudy weather and sea, hills, sand ground, the reliability of system and anti-dry Immunity can directly influence the performance of ballistic missile fighting efficiency.
Frequency hopping communications system is that the saltus step of carrier wave is controlled by pseudo noise code, so as to effectively hide interference signal, is overcome The defect of frequency fixing communication, different from traditional PCM-FM systems with strong antijamming capability, the low feature of intercepting and capturing rate, remote measurement transmitting PCM-PM frequency hopping systems use at end, with band occupancy is narrower, the spectral roll-off advantage such as comparatively fast, it is possible to reduce to closing on communication channel Interference.At telemetry receiving end, to reach reliable reception ability under the low elevation angle (0 °~2 °) state, and it is suitable for cloudy, cloudy The complex dynamic environment such as weather and sea, hills, sand ground, employs diversity and combining techniques to improve the signal to noise ratio of receiver.
Because traditional telemetry system is using frequency system is determined, signal frequency and phase are realized by phaselocked loop closed-loop fashion Adjustment, and frequency-hopping system due to every jump signal can not a certain frequency is resident again the characteristics of, it is impossible to disappeared in time using phase-locked loop manner Except the frequency deviation phase error of signal, therefore conventional method is no longer appropriate for the diversity merging of Frequency Hopping Signal.
The content of the invention
Present invention solves the technical problem that being：Overcome the deficiencies in the prior art, there is provided a kind of Frequency Hopping Signal polarity diversity Merging method, is capable of achieving the reliable reception of frequency-hopping system, and with very strong antijamming capability and complex environment adaptability.
The technical scheme is that：A kind of Frequency Hopping Signal polarity diversity merging method, step is as follows：
1) left-hand polarized antenna and right-handed polarized antenna receive signal respectively, and the AD into respective branch road samples, and obtains AD Dextrorotation Frequency Hopping Signal R after samplingrWith left-handed Frequency Hopping Signal Rl；
2) Digital Down Convert of two paths of signals difference, simultaneous formula (1)~(4), obtain the right hand signal S after solution is jumpedrWith it is left-handed Signal Sl, and left-handed signal is relative to the frequency deviation f of right hand signald, left-handed signal is relative to right hand signal skew
Wherein, fcRepresent current Hopping frequencies；T represents AD sampling instants；al=± 1, f0It is initial frequency deviation, dextrorotation is believed Number SrAs reference signal, fdFrequency deviation for left-handed signal relative to right hand signal,It is left-handed signal relative to right hand signal Skew；
3) to SrAnd S1Two paths of signals carries out conjugate multiplication treatment
Obtained after abbreviation
4) by left-handed tributary signal S1And RnConjugate multiplication, the left-handed signal after being corrected
Complete to left-handed branch road frequency and the open loop correction of phase；Dextrorotation branch road keeps constant, that is, the dextrorotation letter after correcting Number SR=Sr；
5) two tributary signals are merged using high specific synthesizer, completes polarity diversity and merge S=SRCR+SLCL,CL=1-CR,
Wherein, CR,CLThe respectively weighted factor of dextrorotation branch road and left-handed branch road；AGCRFor dextrorotation branch gain controls system Number, AGCLIt is left-handed branch road gain control coefficient.
The present invention has advantages below compared with prior art：
During transmission of wireless signals, because the multipath fading of transmission path can produce space standing wave, may be formed Deep fade, causes the change of transport channel parameters, produces receiving signal attenuation phenomenon, causes distorted signals, meeting under serious conditions Produce signal interruption.Diversity and combining techniques are a kind of effective measures that antinoise signal decline improves reception reliability.It need not be instructed Practice sequence, the quality of radio communication is improved in the case where transimission power and bandwidth is not increased, required expense is relatively low.Diversity Folding is the signal that will carry same information, is transmitted using different paths, different polarization modes, will be each in receiving terminal Individual tributary signal is merged in some way, then extracts information.If the cross correlation very little of the signal fadeout of each branch road, Using rational signal combination technique, the signal to noise ratio of receiver output can be just improved.As shown in Fig. 2 frequency-hopping system receiver is adopted Output signal-to-noise ratio is improved with polarization merging mode, compared with single channel frequency-hopping receiver, the increasing except at most obtaining 3dB in performance It is beneficial outer, multipath effect can also be suppressed.
According to two fading profiles selection weighted value C of channel when polarization mergesRAnd CL, when signal all the way because deep fade During performance extreme difference, can another road be increased weight to improve gain.
Existing polarity diversity merges mode as shown in figure 1, having a main channel and phase discriminator in loop, and loop filtering amplifies Device, the phaselocked loop subaisle of VCO compositions.Using dextrorotation tributary signal S2 (t) as reference signal, left-handed tributary signal S1 (t) is led to The mode of phaselocked loop closed-loop control is crossed, two paths of signals frequency and phase reference alignment is reached, and then complete the synchronization acquistion of signal.
Left-right rotary tributary signal must in time eliminate the frequency difference and difference between two-way when merging, could obtain merging and increase Benefit, otherwise two paths of signals are cancelled out each other, and not only band does not carry out gain can also influence receptivity.Prior art is by phase discriminator, loop The multiple link composition such as filter amplifier and VCO, processing procedure has time delay, it is necessary to estimate frequency deviation and skew according to previous signals Current demand signal is corrected, the premise of do so is that two paths of signals remains identical frequency deviation and skew.In frequency-hopping mode Under, often to jump signal and fall on different frequency bands, the estimation of deviation value extracted in upper hop signal is not particularly suited for next-hop signal.Jump Frequency signal frequency point residence time is short, and the control mode of closed loop feedback can not in time correct frequency deviation and skew, it is impossible to complete pole in real time Change the merging of signal, so the polarity diversity that prior art is not suitable for Frequency Hopping Signal merges.
The present invention proposes a kind of Frequency Hopping Signal polarity diversity merging treatment method, with the mode real-time processing of opened loop control The frequency deviation and skew of two paths of signals, relative to close-loop control mode, with the advantage such as simple structure, processing speed be fast, fit very much The reception of frequency hopping telemetered signal is realized in conjunction, to reach best transmission signal to noise ratio.
Brief description of the drawings
Fig. 1 is prior art phase-locked loop manner diversity Unite principle block diagram.
Fig. 2 is that Gaussian channel equal proportion merges and single channel performance comparison schematic diagram；
Fig. 3 is frequency hopping polarization folding functional block diagram.
Specific embodiment
Below in conjunction with the accompanying drawings 3 and specific embodiment the present invention is described in further detail：
System hops bandwidth 200MHz, bit rate 10Mbps, take antenna diversity and carry out anti-multipath fading, good in order to obtain Good transmission performance, it is necessary to synchronize capture after diversity synthesis, while in order to ensure signal to noise ratio when diversity synthesizes, needing Will solve jump after carry out diversity synthesis because after solving and jumping, signal becomes narrow band signal, signal to noise ratio improve 13dB ().Therefore receiving end signal handling process is first solution jump, filtering extraction, diversity synthesizes, re-demodulation is decoded, this Sample can reach optimal transmission performance.
The maximum difference of continuous carrier modulation /demodulation of the frequency-hopping system modulation /demodulation with is that frequency hopping changes the meeting of frequency moment Produce the saltus step of carrier frequency and phase, it is impossible to use coherent demodulation, it is contemplated that error performance, band efficiency, lock in time Etc. factor, the system uses PCM-PM non-coherent demodulations as the demodulation mode of frequency-hopping system.
Frequency hopping polarity combination functional block diagram is as shown in Figure 3：
1) left-right rotary poliarizing antenna 1 and 2 receives signal respectively, and the AD into respective branch road samples, and obtains Rr、Rl。
2) two paths of signals difference Digital Down Convert, the frequency control word of down coversion local oscillator comes from what is extracted in demodulated signal Frequency hopping frequency point information.
3) signal after down coversion is dropped on 4 times of character rates sample rate by filtering extraction algorithm.
4) two paths of signals respectively obtains S again by matched filtering algorithmlAnd Sr。
5) frequency deviation f is calculateddAnd skewFrequency and phase open loop correction are completed to left-handed branch road, S is obtainedLAnd SR.Again The weighting merging of two-way in-phase signal is obtained into S.
6) code clock is recovered using square clocking error algorithm for estimating, by 4 times of clock frequencies of character rate to S signals I, Q two-way baseband signal are sampled respectively, then eliminate modulation intelligence present in signal using square operation, then estimate The timing information included in signal, its phase is exactly the phase difference existed between sampling clock and signal clock, then according to this Phase error is come to recovering code clock.
7) optimum sampling point under 4 times of character rates is obtained using open loop filtering interpolation algorithm, recovers code element information.
8) modulated signal in PCM-PM differential ference spirals removal code element.And frequency hopping frequency point information is extracted from code element, feed back to Two down conversion modules, complete solution and jump loop.
PCM-PM modulation circular polarisation diversity combining method is the specific embodiment of the invention under the above frequency hopping system Case, the protection domain being not intended to limit the present invention.Protection scope of the present invention is based on opened loop control under frequency-hopping mode Polarity diversity merging method.
The content not being described in detail in description of the invention belongs to the known technology of professional and technical personnel in the field.

Claims (1)

1. a kind of Frequency Hopping Signal polarity diversity merging method, it is characterised in that step is as follows：
1) left-hand polarized antenna and right-handed polarized antenna receive signal respectively, and the AD into respective branch road samples, and obtain AD samplings Dextrorotation Frequency Hopping Signal R afterwardsrWith left-handed Frequency Hopping Signal Rl；
2) Digital Down Convert of two paths of signals difference, simultaneous formula (1)~(4), obtain the right hand signal S after solution is jumpedrWith left-handed signal Sl, and left-handed signal is relative to the frequency deviation f of right hand signald, left-handed signal is relative to right hand signal skew
S r = a n e j [ 2 π ( f 0 ) ] t - - - ( 2 )
R l = S l e j [ 2 π ( f c ) ] t - - - ( 3 )
R r = S r e j [ 2 π ( f c ) ] t - - - ( 4 )
Wherein, fcRepresent current Hopping frequencies；T represents AD sampling instants；an=± 1, f0It is initial frequency deviation, by right hand signal SrMake It is reference signal, fdFrequency deviation for left-handed signal relative to right hand signal,It is left-handed signal relative to right hand signal skew；
3) to SrAnd S1Two paths of signals carries out conjugate multiplication treatment
Obtained after abbreviation
4) by left-handed tributary signal SlAnd RnConjugate multiplication, the left-handed signal after being corrected
Complete to left-handed branch road frequency and the open loop correction of phase；Dextrorotation branch road keeps constant, that is, the right hand signal S after correctingR= Sr；
5) two tributary signals are merged using high specific synthesizer, completes polarity diversity and merge
S = S R C R + S L C L , C R = 1 1 + k , C L = 1 - C R , k = AGC R AGC L ;
Wherein, CR,CLThe respectively weighted factor of dextrorotation branch road and left-handed branch road；AGCRIt is dextrorotation branch gain control coefrficient, AGCLIt is left-handed branch road gain control coefficient.
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Cited By (5)

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CN109709821A (en) * 2018-11-28 2019-05-03 北京空天技术研究所 Communication time-delay measurement method on bullet
CN111896917A (en) * 2020-07-30 2020-11-06 北京融为科技有限公司 Left-handed and right-handed signal polarization synthesis method
CN112910532A (en) * 2021-01-13 2021-06-04 浙江天则通信技术有限公司 Multi-antenna receiving system and method for PCMFM
CN116979995A (en) * 2023-09-20 2023-10-31 成都谐盈科技有限公司 Open loop spectrum correction method for frequency hopping system
CN117614505A (en) * 2024-01-23 2024-02-27 北京融为科技有限公司 Polarization diversity synthesis method and device based on two-path CMA equalization

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Publication number Priority date Publication date Assignee Title
CN109709821A (en) * 2018-11-28 2019-05-03 北京空天技术研究所 Communication time-delay measurement method on bullet
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CN111896917A (en) * 2020-07-30 2020-11-06 北京融为科技有限公司 Left-handed and right-handed signal polarization synthesis method
CN112910532A (en) * 2021-01-13 2021-06-04 浙江天则通信技术有限公司 Multi-antenna receiving system and method for PCMFM
CN116979995A (en) * 2023-09-20 2023-10-31 成都谐盈科技有限公司 Open loop spectrum correction method for frequency hopping system
CN116979995B (en) * 2023-09-20 2023-12-26 成都谐盈科技有限公司 Open loop spectrum correction method for frequency hopping system
CN117614505A (en) * 2024-01-23 2024-02-27 北京融为科技有限公司 Polarization diversity synthesis method and device based on two-path CMA equalization
CN117614505B (en) * 2024-01-23 2024-04-09 北京融为科技有限公司 Polarization diversity synthesis method and device based on two-path CMA equalization

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