CN106849994B - A kind of Frequency Hopping Signal polarity diversity merging method - Google Patents
A kind of Frequency Hopping Signal polarity diversity merging method Download PDFInfo
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- CN106849994B CN106849994B CN201611141008.5A CN201611141008A CN106849994B CN 106849994 B CN106849994 B CN 106849994B CN 201611141008 A CN201611141008 A CN 201611141008A CN 106849994 B CN106849994 B CN 106849994B
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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
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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
- H04B1/707—Spread spectrum techniques using direct sequence modulation
- H04B1/7097—Interference-related aspects
- H04B1/711—Interference-related aspects the interference being multi-path interference
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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
- H04B1/715—Interference-related aspects
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Abstract
A kind of diversity combining method of Frequency Hopping Signal of the present invention, carries out AD sampling for left-right rotary poliarizing antenna received signal first respectively, and two-way baseband signal is obtained after Digital Down Convert；Then to left and right rotation baseband signal conjugate multiplication, the frequency deviation and skew estimated value of left-handed baseband signal are obtained after doing FFT transform, amendment deviation completes the open loop correction of left-handed branch.Merging finally is weighted to the baseband signal after correction, the polarity diversity for completing Frequency Hopping Signal merges.The invention proposes a kind of Frequency Hopping Signal polarity diversity merging treatment methods, handle the frequency deviation and skew of two paths of signals in real time with the mode of opened loop control, relative to close-loop control mode, the advantages such as, processing speed simple with structure be fast, it is very suitable to realize the reception of frequency hopping telemetered signal, to reach best transmission signal-to-noise ratio.
Description
Technical field
The present invention relates to telemetry communication field, in particular to a kind of Frequency Hopping Signal polarity diversity merging method.
Background technique
Telemetry system is indispensable important component in ballistic missile system, is developed in the ballistic missile life-cycle
In the process, telemetry system is used to obtain the working status parameter and environmental data of each system in flight test, elastic for determination
It can or carry out accident analysis and foundation be provided.
In Missile Telemetry System, radio channel is played on bullet between Telemetry Data Acquisition device and Data Processing Ground Station
Information transmitting 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.Especially complex adaptability yin
It, in the complicated geographical environments 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 jump for controlling carrier wave by pseudo noise code overcomes to effectively hide interference signal
The defect of frequency fixing communication has the characteristics that strong antijamming capability, intercepting and capturing rate are low, different from traditional PCM-FM system, telemetering transmitting
End PCM-PM frequency hopping system has the advantages such as band occupancy is relatively narrow, spectral roll-off is very 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 environments such as weather and sea, hills, sand ground, the signal-to-noise ratio of receiver is improved using diversity and combining techniques.
Since 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 cannot the resident feature of a certain frequency again, can not be 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.
Summary of the invention
Present invention solves the technical problem that being：A kind of Frequency Hopping Signal polarity diversity is overcome the deficiencies of the prior art and provide
Merging method, it can be achieved that frequency-hopping system reliable reception, and have very strong anti-interference ability and complex environment adaptability.
The technical scheme is that：A kind of Frequency Hopping Signal polarity diversity merging method, steps are as follows：
1) left-hand polarized antenna and right-handed polarized antenna receive signal respectively, and the AD into respective branch is sampled, and obtain AD
Dextrorotation Frequency Hopping Signal R after samplingrWith left-handed Frequency Hopping Signal Rl；
2) two paths of signals distinguishes Digital Down Convert, and joint type (1)~(4) obtain the right hand signal S after solution is jumpedrWith it is left-handed
Signal SlAnd frequency deviation f of the left-handed signal relative to right hand signald, the skew of left-handed signal relative to right hand signal
Wherein, fcIndicate current Hopping frequencies；T indicates AD sampling instant；an=± 1, f0To originate 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 SlTwo paths of signals carries out conjugate multiplication processing
It is obtained after abbreviation
4) by left-handed tributary signal SlAnd RnConjugate multiplication, the left-handed signal after being corrected
Complete the open loop correction to left-handed branch frequency and phase；Dextrorotation branch remains unchanged, that is, the dextrorotation letter after correcting
Number SR=Sr；
5) two tributary signals are merged using high specific synthesizer, completes polarity diversity and merges
S=SRCR+SLCL,CL=1-CR,
Wherein, CR,CLThe respectively weighted factor of dextrorotation branch and left-handed branch；AGCRIt is controlled for dextrorotation branch gain and is
Number, AGCLFor left-handed branch gain control coefficient.
Compared with the prior art, the present invention has the following advantages：
During wireless signal transmission, since the multipath fading of transmission path can generate space standing wave, it may will form
Deep fade causes the variation of transport channel parameters, generates receiving signal attenuation phenomenon, causes distorted signals, meeting under serious conditions
Generate signal interruption.Diversity and combining techniques are a kind of effective measures that antinoise signal decline improves reception reliability.It does not need to instruct
Practice sequence, improves the quality of wireless communication in the case where not increasing transimission power and bandwidth, required cost 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 end
A tributary signal is merged in some way, then extracts information.If the cross correlation very little of the signal fadeout of each branch,
Using reasonable signal combination technique, the signal-to-noise ratio of receiver output can be improved.As shown in Fig. 2, frequency-hopping system receiver is adopted
Output signal-to-noise ratio is improved with polarization merging mode, the increasing compared with single channel frequency-hopping receiver, in addition at most obtaining 3dB in performance
It is beneficial outer, multipath effect can also be inhibited.
Weighted value C is selected according to the fading profiles of two channels when polarization mergesRAnd CL, when signal all the way because of deep fade
When showing very poor, weight can be increased another way 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 composition.It regard dextrorotation tributary signal S2 (t) as reference signal, left-handed tributary signal S1 (t) is logical
The mode for crossing phaselocked loop closed-loop control reaches two paths of signals frequency and phase reference alignment, and then completes the synchronization acquistion of signal.
Left-right rotary tributary signal must eliminate the frequency difference and difference between two-way in time when merging, could obtain merging and increase
Benefit, otherwise two paths of signals is cancelled out each other, and not only band, which does not carry out gain, also will affect receptivity.The prior art is by phase discriminator, loop
Multiple link compositions such as filter amplifier and VCO, treatment process have time delay, need to estimate frequency deviation and skew according to previous signals
Current demand signal is corrected, the premise done so is that two paths of signals remains identical frequency deviation and skew.In frequency-hopping mode
Under, every jump signal is fallen on different frequency bands, and the estimation of deviation value extracted in upper hop signal is not particularly suited for next-hop signal.It jumps
Frequency signal frequency point residence time is short, and the control mode of closed loop feedback cannot correct frequency deviation and skew in time, can not complete pole in real time
Change the merging of signal, so the polarity diversity that the prior art is not suitable for Frequency Hopping Signal merges.
The invention proposes a kind of Frequency Hopping Signal polarity diversity merging treatment methods, are handled in real time with the mode of opened loop control
The frequency deviation and skew of two paths of signals have the advantages such as structure is simple, processing speed is fast relative to close-loop control mode, very suitable
The reception for realizing frequency hopping telemetered signal is closed, to reach best transmission signal-to-noise ratio.
Detailed description of the invention
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
With reference to the accompanying drawing 3 and specific embodiment the present invention is described in further detail：
System hops bandwidth 200MHz, bit rate 10Mbps takes antenna diversity and carrys 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 guarantee signal-to-noise ratio when diversity synthesis, need
Diversity synthesis is carried out after solution is jumped, because signal becomes narrow band signal after solution is jumped, signal-to-noise ratio is improvedTherefore receiving end signal process flow is first to solve jump, filtering extraction, diversity synthesis, re-demodulation
Decoding, can achieve optimal transmission performance in this way.
Frequency-hopping system modulation /demodulation is that frequency hopping changes the meeting of frequency moment with the maximum difference of general continuous carrier modulation /demodulation
The jump for generating carrier frequency and phase, can not use coherent demodulation, it is contemplated that error performance, band efficiency, synchronization time
Etc. factors, this system use demodulation mode of the PCM-PM non-coherent demodulation as 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 is sampled, and obtains Rr、Rl。
2) two paths of signals distinguishes Digital Down Convert, what the frequency control word of down coversion local oscillator extracted in demodulated signal
Frequency hopping frequency point information.
3) signal after down coversion is dropped to sample rate on 4 times of character rates by filtering extraction algorithm.
4) two paths of signals respectively obtains S using matched filtering algorithmlAnd Sr。
5) frequency deviation f is calculateddAnd skewFrequency and phase open loop correction are completed to left-handed branch, obtain SLAnd SR.Again
The weighting of two-way in-phase signal is merged and obtains S.
6) code clock is restored using square clocking error algorithm for estimating, by the clock frequency of 4 times of character rates to S signal
I, Q two-way baseband signal is sampled respectively, then eliminates modulation intelligence present in signal using square operation, then estimate
The timing information for including in signal, phase is exactly existing phase difference between sampling clock and signal clock, then according to this
Phase error is come to recovery 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 spiral removal symbol.And frequency hopping frequency point information is extracted from symbol, it feeds back to
Two down conversion modules complete solution and jump loop.
It is the specific embodiment of the invention that PCM-PM, which modulates circular polarisation diversity combining method, under frequency hopping system described above
Case, be not intended to limit the scope of protection of the present invention.Protection scope of the present invention is under frequency-hopping mode based on opened loop control
Polarity diversity merging method.
The content that description in the present invention is not described in detail belongs to the well-known technique 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 steps are as follows：
1) left-hand polarized antenna and right-handed polarized antenna receive signal respectively, and the AD into respective branch is sampled, and obtain AD sampling
Dextrorotation Frequency Hopping Signal R afterwardsrWith left-handed Frequency Hopping Signal Rl；
2) two paths of signals distinguishes Digital Down Convert, and joint type (1)~(4) obtain the right hand signal S after solution is jumpedrWith left-handed signal
SlAnd frequency deviation f of the left-handed signal relative to right hand signald, the skew of left-handed signal relative to right hand signal
Wherein, fcIndicate current Hopping frequencies；T indicates AD sampling instant；an=± 1, f0To originate frequency deviation, by right hand signal SrMake
For reference signal, fdFrequency deviation for left-handed signal relative to right hand signal,Phase for left-handed signal relative to right hand signal
Partially；
3) to SrAnd SlTwo paths of signals carries out conjugate multiplication processing
It is obtained after abbreviation
4) by left-handed tributary signal SlAnd RnConjugate multiplication, the left-handed signal after being corrected
Complete the open loop correction to left-handed branch frequency and phase；Dextrorotation branch remains unchanged, that is, the right hand signal S after correctingR=
Sr；
5) two tributary signals are merged using high specific synthesizer, completes polarity diversity and merges
S=SRCR+SLCL,CL=1-CR,
Wherein, CR,CLThe respectively weighted factor of dextrorotation branch and left-handed branch；AGCRFor dextrorotation branch gain control coefrficient,
AGCLFor left-handed branch gain control coefficient.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109709821B (en) * | 2018-11-28 | 2022-02-08 | 北京空天技术研究所 | Method for measuring delay of on-board communication |
| 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 |
| CN112910532B (en) * | 2021-01-13 | 2022-05-17 | 浙江天则通信技术有限公司 | Multi-antenna receiving system and method for PCMFM |
| 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 |
| 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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