CN102269808B - Anti-active-jamming method in wind profile radar signal detection - Google Patents
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Abstract
The invention discloses an anti-active-jamming method in wind profile radar signal detection. The method comprises the following specific steps: firstly constructing a wind profile radar anti-active jamming system which comprises an intra-pulse inter-pulse modulation circuit (3), an intra-pulse inter-pulse demodulation circuit (4), an intra-pulse modulating sequence generating circuit (1), an inter-pulse modulation sequence generating circuit (2), a pulse signal source (5) and a signal processor (10); secondly, generating a modulation sequence by the intra-pulse modulating sequence generating circuit (1) and the inter-pulse modulation sequence generating circuit (2); thirdly, modulating an emitting signal by the intra-pulse inter-pulse modulation circuit (3); and fourthly, demodulating and pre-processing an echo signal by the intra-pulse inter-pulse demodulation circuit (4); and therefore, the wind profile radar anti-active jamming method is realized. The anti-active jamming method can effectively resist the external active jamming, improve the detection ability to a target signal and obviously enhance the detection result of the wind profile radar.
Description
Technical field
The present invention relates to a kind of wind profile radar acquisition of signal method, anti-Active Jamming Method in particularly a kind of wind profile radar acquisition of signal.
Background technology
(Wind Profiling Radar WPR) is a kind of round-the-clock atmospheric remote sensing detecting devices that electromagnetic reflection and scattering is come physical quantitys such as continuous probe atmospheric wind through the atmospheric sounding turbulent flow to wind profile radar.What wind profile radar was surveyed is constantly the atmospheric turbulence of motion, measures atmosphere wind speed, wind direction through the mass motion of atmospheric sounding turbulent flow group uneven texture, has higher survey wind real-time and precision, is one of key equipment of Small and Medium Sized atmospheric exploration.
Wind profile radar operates mainly in VHF and uhf band, and very approaching with broadcasting, TV and wireless communication frequency band, electromagnetic environment is extremely abominable.Because the reflection and the scatter echo signal of atmospheric turbulence are very faint, usually covered by active electromagnetic radiation, therefore active electromagnetic radiation becomes serious active electromagnetic interference (EMI), often causes wind profile radar normally not survey.And traditional wind profile radar is mainly used in conventional the detection, through transmitter and the common pulse signal of antenna emission, receives echoed signal by antenna and receiver again; Carry out signal Processing by signal processor; From the wind spectrum, extract wind field information, this technical functionality is single, does not have the method for effective anti-Active Jamming; Though in signal processor, used coherent accumulation, spectrum to offset method; Can suppress some Active Jamming, but that the actual detection result proves these methods is little for the improvement effect of removing undesired signal, DeGrain.
Summary of the invention
The object of the present invention is to provide anti-Active Jamming Method in a kind of wind profile radar acquisition of signal, solve and cause the inaccurate problem of result of detection a little less than the anti-Active Jamming ability of traditional wind profile radar.
Anti-Active Jamming Method in a kind of wind profile radar acquisition of signal, its concrete steps are:
The first step is built the anti-Active Jamming System of wind profile radar
The anti-Active Jamming System of wind profile radar comprises: modulation sequence generative circuit, pulse signal source, transmitter, transmit-receive switch, antenna, receiver and signal processor between demodulator circuit, arteries and veins internal modulation sequence generative circuit, arteries and veins in modulation circuit, the intercadence between arteries and veins in the arteries and veins.
Modulation circuit, transmitter, transmit-receive switch, receiver, the interior demodulator circuit of intercadence and signal processor are in sequential series between pulse signal source, the interior arteries and veins of arteries and veins; Transmit-receive switch is electrically connected with antenna, signal processor respectively with arteries and veins internal modulation sequence generative circuit and arteries and veins between the modulation sequence generative circuit be electrically connected; Arteries and veins internal modulation sequence generative circuit respectively with arteries and veins between arteries and veins in modulation circuit and the intercadence demodulator circuit be electrically connected, between arteries and veins the modulation sequence generative circuit respectively with arteries and veins between arteries and veins in modulation circuit and the intercadence demodulator circuit be electrically connected.
Arteries and veins internal modulation sequence generative circuit is used to generate arteries and veins internal modulation sequence, and the modulation sequence generative circuit is used to generate modulation sequence between arteries and veins between arteries and veins.In the arteries and veins between arteries and veins modulation circuit be used to adopt arteries and veins internal modulation sequence that the pulse signal that will launch is carried out the arteries and veins internal modulation, the pulse signal after adopting modulation sequence between arteries and veins to the arteries and veins internal modulation that will launch then carries out modulating between arteries and veins.Demodulator circuit is used to adopt modulation sequence between arteries and veins that the echoed signal of the pulse-modulated signal launched is carried out between arteries and veins correlation demodulation to handle in the intercadence, and the echoed signal after adopting arteries and veins internal modulation sequence to demodulation between arteries and veins is again carried out correlation demodulation and pulse pressure pre-service in the arteries and veins.
The modulation sequence generative circuit generates modulation sequence between the second step arteries and veins internal modulation sequence generative circuit and arteries and veins
Arteries and veins internal modulation sequence generative circuit generates arteries and veins internal modulation sequence, and the modulation sequence generative circuit generates modulation sequence between arteries and veins between arteries and veins.Arteries and veins internal modulation sequence adopts the mutual-complementing code sequence, and modulation sequence adopts pseudorandom m sequence between arteries and veins, by signal processor modulation sequence generative circuit input coding figure place and sequence length parameter signal between arteries and veins internal modulation sequence generative circuit, arteries and veins.If the code length of mutual-complementing code sequence is K, K=4 or 8 or 16 then; The length of m sequence is L, L=Na*Nf then, and wherein Na is a coherent accumulation number, Nf is counting of FFT conversion.The modulation sequence generative circuit generates modulation sequence between arteries and veins internal modulation sequence and arteries and veins according to above-mentioned parameter respectively between arteries and veins internal modulation sequence generative circuit, arteries and veins, for phase modulation (PM), and 1 expression, 0 degree phase place in the modulation sequence, 0 and-1 representes 180 degree phase places.Modulation sequence in the arteries and veins that generates, between arteries and veins is exported in the arteries and veins between arteries and veins demodulator circuit in the modulation circuit and intercadence, and preserve; Pulse signal source modulation circuit output pulse signal between arteries and veins in arteries and veins simultaneously.
The modulation circuit modulation that transmits between arteries and veins in the 3rd step arteries and veins
In arteries and veins, adopt modulation sequence the pulse signal that will launch to be carried out the phase modulation (PM) of 0 degree and 180 degree between arteries and veins in the modulation circuit.At first, adopt phase tranformation in the arteries and veins of arteries and veins internal modulation sequence control transponder pulse signal, then, phase tranformation between the pulse signal control arteries and veins after adopting modulation sequence between arteries and veins to the arteries and veins internal modulation.Transponder pulse signal has formed a transponder pulse modulation signal through in the arteries and veins, between arteries and veins after the modulation, after the transponder pulse modulation signal is sent into transmitter and amplified, launches through antenna.Here, the subpulse number of each transponder pulse modulation signal of formation is K, and is identical with the code length of arteries and veins internal modulation sequence, and total number of transponder pulse modulation signal is L, and is identical with the length of modulation sequence between arteries and veins.
The interior demodulator circuit of the 4th step intercadence carries out echoed signal and separates the mediation pre-service
The transponder pulse modulation signal forms echoed signal after atmospheric turbulence reflection and scattering, antenna and receiver receive, sample echoed signal, forms digital echo signal, sends into the interior demodulator circuit of intercadence and carries out the correlation demodulation processing.Demodulation method to digital echo signal carries out is corresponding with modulator approach, is phase demodulating.What adopt during emission is the phase modulation (PM) of 0 degree and 180 degree; Utilize modulation sequence and arteries and veins internal modulation sequence between the arteries and veins of being stored in the demodulator circuit in the intercadence; Carry out between the arteries and veins relevant and phase demodulating processing in the arteries and veins to digital echo signal, and carry out the digital pulse compression pre-service of phase encoding in the arteries and veins with the emission modulation.To separate and be in harmonious proportion pretreated digital echo signal and send into signal processor and make further signal Processing.
To I, that Q two-way digital quadrature signal is made the demodulation process process is following: at first adopt phase tranformation between the arteries and veins of modulation sequence control figure echoed signal between arteries and veins; Then adopt the interior phase tranformation of arteries and veins of arteries and veins internal modulation sequence control figure echoed signal, and carry out the pulse pressure pre-service.The mutual-complementing code sequence has true form and complement code sequence, and the true form sequence and the complement code sequence data of I, Q two paths of signals are decoded respectively and convolution algorithm, then with the operation result addition of two sequences, forms the pulse pressure result of I, Q two paths of signals.For I road signal data, establish Ia, Ib is respectively true form and complement code sequence data, Ma, Mb are respectively the coded sequence of true form and complement code, and length all is K, and pulse pressure result is I, then has:
Q road signal is made same treatment, last, will pass through I, Q two ways of digital signals after the above-mentioned processing and export to signal processor and make further signal Processing.
So far, realized the anti-Active Jamming Method of wind profile radar.
The arteries and veins internal modulation sequence that this method adopts has good autocorrelation performance; The pseudo-random sequence statistical property that adopts is very near white noise; Can keep the related objective signal, albefaction undesired signal, the extraneous Active Jamming of antagonism effectively; Raising has obviously improved the result of detection of wind profile radar to the detectability of echo signal.Through actual testing authentication, the interference of encoding between the personal attendant's machine arteries and veins according to the real work parameter setting suppresses to reach 30dB, and coding reaches more than the 13dB available signal power increase in the arteries and veins.
Description of drawings
The anti-Active Jamming System synoptic diagram of wind profile radar of anti-Active Jamming Method in a kind of wind profile radar acquisition of signal of Fig. 1.
1. modulation circuit between arteries and veins in modulation sequence generative circuit 3. arteries and veins between arteries and veins internal modulation sequence generative circuit 2. arteries and veins
4. demodulator circuit 5. pulse signal sources 6. transmitters 7. transmit-receive switches 8. antennas 9. receivers in the intercadence
10. signal processor
Embodiment
Anti-Active Jamming Method in a kind of wind profile radar acquisition of signal, its concrete steps are:
The first step is built the anti-Active Jamming System of wind profile radar
The anti-Active Jamming System of wind profile radar comprises: modulation sequence generative circuit 2, pulse signal source 5, transmitter 6, transmit-receive switch 7, antenna 8, receiver 9 and signal processor 10 between demodulator circuit 4, arteries and veins internal modulation sequence generative circuit 1, arteries and veins in modulation circuit 3, the intercadence between arteries and veins in the arteries and veins.
Arteries and veins internal modulation sequence generative circuit 1 is used to generate arteries and veins internal modulation sequence, and modulation sequence generative circuit 2 is used to generate modulation sequence between arteries and veins between arteries and veins.In the arteries and veins between arteries and veins modulation circuit 3 be used to adopt arteries and veins internal modulation sequence that the pulse signal that will launch is carried out the arteries and veins internal modulation, the pulse signal after adopting modulation sequence between arteries and veins to the arteries and veins internal modulation that will launch then carries out modulating between arteries and veins.Demodulator circuit 4 is used to adopt modulation sequence between arteries and veins that the echoed signal of the pulse-modulated signal launched is carried out between arteries and veins correlation demodulation to handle in the intercadence, and the echoed signal after adopting arteries and veins internal modulation sequence to demodulation between arteries and veins is again carried out correlation demodulation and pulse pressure pre-service in the arteries and veins.
Modulation sequence generative circuit 2 generates modulation sequence between the second step arteries and veins internal modulation sequence generative circuit 1 and arteries and veins
Arteries and veins internal modulation sequence generative circuit 1 generates arteries and veins internal modulation sequence, and modulation sequence generative circuit 2 generates modulation sequence between arteries and veins between arteries and veins.Arteries and veins internal modulation sequence adopts the mutual-complementing code sequence, and modulation sequence adopts pseudorandom m sequence between arteries and veins, by signal processor 10 modulation sequence generative circuit 2 input coding figure places and sequence length parameter signal between arteries and veins internal modulation sequence generative circuit 1, arteries and veins.If the code length of mutual-complementing code sequence is K, K=4 or 8 or 16 then; The length of m sequence is L, L=Na*Nf then, and wherein Na is a coherent accumulation number, Nf is counting of FFT conversion.Modulation sequence generative circuit 2 generates modulation sequence between arteries and veins internal modulation sequence and arteries and veins according to above-mentioned parameter respectively between arteries and veins internal modulation sequence generative circuit 1, arteries and veins, for phase modulation (PM), and 1 expression, 0 degree phase place in the modulation sequence, 0 and-1 representes 180 degree phase places.Modulation sequence in the arteries and veins that generates, between arteries and veins is exported in the arteries and veins between arteries and veins demodulator circuit 4 in the modulation circuit 3 and intercadence, and preserve; Pulse signal source 5 modulation circuit 3 output pulse signals between arteries and veins in arteries and veins simultaneously.
Suppose that the arteries and veins internal modulation sequence that generates is 16 a mutual-complementing code sequence: { 1,1,1 ,-1 ,-1 ,-1,1 ,-1 ,-1 ,-1 ,-1,1 ,-1 ,-1,1 ,-1 }, { 1,1,1 ,-1 ,-1 ,-1,1 ,-1,1,1,1 ,-1,1,1 ,-1,1 }; The seed of m sequence is { 0,000 0,000 0,000 0,000 0001 }, and primitive polynomial is [4000011]
8, the total length of formation sequence is L.4 and 8 s' mutual-complementing code sequence is respectively:
4 mutual-complementing code sequences: 1,1 ,-1,1}, 1 ,-1 ,-1,1};
8 mutual-complementing code sequences: 1 ,-1 ,-1,1 ,-1 ,-1,1 ,-1}, 1 ,-1 ,-1,1,1,1 ,-1,1}.
In arteries and veins, adopt modulation sequence the pulse signal that will launch to be carried out the phase modulation (PM) of 0 degree and 180 degree between arteries and veins in the modulation circuit 3.At first, adopt phase tranformation in the arteries and veins of arteries and veins internal modulation sequence control transponder pulse signal, then, phase tranformation between the pulse signal control arteries and veins after adopting modulation sequence between arteries and veins to the arteries and veins internal modulation.Transponder pulse signal has formed a transponder pulse modulation signal through in the arteries and veins, between arteries and veins after the modulation, after the transponder pulse modulation signal is sent into transmitter 6 and amplified, launches through antenna.Here, the subpulse number of each transponder pulse modulation signal of formation is K, and is identical with the code length of arteries and veins internal modulation sequence, and total number of transponder pulse modulation signal is L, and is identical with the length of modulation sequence between arteries and veins.
The interior demodulator circuit 4 of the 4th step intercadence carries out echoed signal and separates the mediation pre-service
The transponder pulse modulation signal forms echoed signal after atmospheric turbulence reflection and scattering, antenna 8 receives, samples with 9 pairs of echoed signals of receiver, forms digital echo signal, sends into the interior demodulator circuit 4 of intercadence and carries out the correlation demodulation processing.Demodulation method to digital echo signal carries out is corresponding with modulator approach, is phase demodulating.What adopt during emission is the phase modulation (PM) of 0 degree and 180 degree; Utilize modulation sequence and arteries and veins internal modulation sequence between the arteries and veins of being stored in the demodulator circuit 4 in the intercadence; Carry out between the arteries and veins relevant and phase demodulating processing in the arteries and veins to digital echo signal, and carry out the digital pulse compression pre-service of phase encoding in the arteries and veins with the emission modulation.To separate and be in harmonious proportion pretreated digital echo signal and send into signal processor and make further signal Processing.
To I, that Q two-way digital quadrature signal is made the demodulation process process is following: at first adopt phase tranformation between the arteries and veins of modulation sequence control figure echoed signal between arteries and veins; Then adopt the interior phase tranformation of arteries and veins of arteries and veins internal modulation sequence control figure echoed signal, and carry out the pulse pressure pre-service.The mutual-complementing code sequence has true form and complement code sequence, and the true form sequence and the complement code sequence data of I, Q two paths of signals are decoded respectively and convolution algorithm, then with the operation result addition of two sequences, forms the pulse pressure result of I, Q two paths of signals.For I road signal data, establish Ia, Ib is respectively true form and complement code sequence data, Ma, Mb are respectively the coded sequence of true form and complement code, and length all is K, and pulse pressure result is I, then has:
Q road signal is made same treatment, last, will pass through I, Q two ways of digital signals after the above-mentioned processing and export to signal processor and make further signal Processing.
So far, realized the anti-Active Jamming Method of wind profile radar.
Claims (1)
1. anti-Active Jamming Method in the wind profile radar acquisition of signal is characterized in that concrete steps are:
The first step is built the anti-Active Jamming System of wind profile radar
The anti-Active Jamming System of wind profile radar comprises: modulation sequence generative circuit (2), pulse signal source (5), transmitter (6), transmit-receive switch (7), antenna (8), receiver (9) and signal processor (10) between demodulator circuit (4), arteries and veins internal modulation sequence generative circuit (1), arteries and veins in modulation circuit (3), the intercadence between arteries and veins in the arteries and veins;
Modulation circuit (3), transmitter (6), transmit-receive switch (7), receiver (9), the interior demodulator circuit (4) of intercadence and signal processor (10) are in sequential series between pulse signal source (5), the interior arteries and veins of arteries and veins; Transmit-receive switch (7) is electrically connected with antenna (8), signal processor (10) respectively with arteries and veins internal modulation sequence generative circuit (1) and arteries and veins between modulation sequence generative circuit (2) be electrically connected; Arteries and veins internal modulation sequence generative circuit (1) respectively with arteries and veins between arteries and veins in modulation circuit (3) and the intercadence demodulator circuit (4) is electrically connected, between arteries and veins modulation sequence generative circuit (2) respectively with arteries and veins between arteries and veins modulation circuit (3) and the interior demodulator circuit (4) of intercadence be electrically connected;
Arteries and veins internal modulation sequence generative circuit (1) is used to generate arteries and veins internal modulation sequence, and modulation sequence generative circuit (2) is used to generate modulation sequence between arteries and veins between arteries and veins; In the arteries and veins between arteries and veins modulation circuit (3) be used to adopt arteries and veins internal modulation sequence that the pulse signal that will launch is carried out the arteries and veins internal modulation, the pulse signal after adopting modulation sequence between arteries and veins to the arteries and veins internal modulation that will launch then carries out modulating between arteries and veins; Demodulator circuit (4) is used to adopt modulation sequence between arteries and veins that the echoed signal of the pulse-modulated signal launched is carried out between arteries and veins correlation demodulation to handle in the intercadence, and the echoed signal after adopting arteries and veins internal modulation sequence to demodulation between arteries and veins is again carried out correlation demodulation and pulse pressure pre-service in the arteries and veins;
Modulation sequence generative circuit (2) generates modulation sequence between the second step arteries and veins internal modulation sequence generative circuit (1) and arteries and veins
Arteries and veins internal modulation sequence generative circuit (1) generates arteries and veins internal modulation sequence, and modulation sequence generative circuit (2) generates modulation sequence between arteries and veins between arteries and veins; Arteries and veins internal modulation sequence adopts the mutual-complementing code sequence, and modulation sequence adopts pseudorandom m sequence between arteries and veins, by signal processor (10) modulation sequence generative circuit (2) input coding figure place and sequence length parameter signal between arteries and veins internal modulation sequence generative circuit (1), arteries and veins; If the code length of mutual-complementing code sequence is K, K=4 or 8 or 16 then; The length of m sequence is L, L=Na*Nf then, and wherein Na is a coherent accumulation number, Nf is counting of FFT conversion; Modulation sequence generative circuit (2) generates modulation sequence between arteries and veins internal modulation sequence and arteries and veins according to above-mentioned parameter respectively between arteries and veins internal modulation sequence generative circuit (1), arteries and veins, for phase modulation (PM), and 1 expression, 0 degree phase place in the modulation sequence, 0 and-1 representes 180 degree phase places; Modulation sequence in the arteries and veins that generates, between arteries and veins is exported in the arteries and veins modulation circuit (3) and the interior demodulator circuit (4) of intercadence between arteries and veins, and preserve; Pulse signal source (5) modulation circuit (3) output pulse signal between arteries and veins in arteries and veins simultaneously;
Modulation circuit (3) modulation that transmits between arteries and veins in the 3rd step arteries and veins
In arteries and veins, adopt modulation sequence the pulse signal that will launch to be carried out the phase modulation (PM) of 0 degree and 180 degree between arteries and veins in the modulation circuit (3); At first, adopt phase tranformation in the arteries and veins of arteries and veins internal modulation sequence control transponder pulse signal, then, phase tranformation between the pulse signal control arteries and veins after adopting modulation sequence between arteries and veins to the arteries and veins internal modulation; Transponder pulse signal has formed a transponder pulse modulation signal through in the arteries and veins, between arteries and veins after the modulation, after the transponder pulse modulation signal is sent into transmitter (6) and amplified, launches through antenna; Here, the subpulse number of each transponder pulse modulation signal of formation is K, and is identical with the code length of arteries and veins internal modulation sequence, and total number of transponder pulse modulation signal is L, and is identical with the length of modulation sequence between arteries and veins;
The interior demodulator circuit (4) of the 4th step intercadence carries out echoed signal and separates the mediation pre-service
The transponder pulse modulation signal forms echoed signal after atmospheric turbulence reflection and scattering, antenna (8) and receiver (9) receive, sample echoed signal, forms digital echo signal, sends into the interior demodulator circuit (4) of intercadence and carries out the correlation demodulation processing; Demodulation method to digital echo signal carries out is corresponding with modulator approach, is phase demodulating; What adopt during emission is the phase modulation (PM) of 0 degree and 180 degree; Utilize modulation sequence and arteries and veins internal modulation sequence between the arteries and veins of being stored in the demodulator circuit (4) in the intercadence; Carry out between the arteries and veins relevant and phase demodulating processing in the arteries and veins to digital echo signal, and carry out the digital pulse compression pre-service of phase encoding in the arteries and veins with the emission modulation; To separate and be in harmonious proportion pretreated digital echo signal and send into signal processor and make further signal Processing;
To I, that Q two-way digital quadrature signal is made the demodulation process process is following: at first adopt phase tranformation between the arteries and veins of modulation sequence control figure echoed signal between arteries and veins; Then adopt the interior phase tranformation of arteries and veins of arteries and veins internal modulation sequence control figure echoed signal, and carry out the pulse pressure pre-service; The mutual-complementing code sequence has true form and complement code sequence, and the true form sequence and the complement code sequence data of I, Q two paths of signals are decoded respectively and convolution algorithm, then with the operation result addition of two sequences, forms the pulse pressure result of I, Q two paths of signals; For I road signal data, establish Ia, Ib is respectively true form and complement code sequence data, Ma, Mb are respectively the coded sequence of true form and complement code, and length all is K, and pulse pressure result is I, then has:
Q road signal is made same treatment, last, will pass through I, Q two ways of digital signals after the above-mentioned processing and export to signal processor and make further signal Processing;
So far, realized the anti-Active Jamming Method of wind profile radar.
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| JP6375250B2 (en) * | 2015-03-03 | 2018-08-15 | パナソニック株式会社 | Radar equipment |
| CN104793211A (en) * | 2015-04-24 | 2015-07-22 | 芜湖航飞科技股份有限公司 | Method for suppressing interference on wind profile radar |
| CN104914435B (en) * | 2015-05-14 | 2017-03-29 | 北京无线电测量研究所 | A kind of wind profile radar phase coding method and circuit based on Fei Lanke codes |
| CN109856603B (en) * | 2019-03-26 | 2021-12-28 | 森思泰克河北科技有限公司 | Radar anti-interference method, terminal device and storage medium |
| CN112130117B (en) * | 2020-09-24 | 2024-09-13 | 中国人民解放军63880部队 | Method for generating frequency coding, phase coding and nonlinear frequency modulation signals |
| CN112946580B (en) * | 2021-01-14 | 2021-11-12 | 无锡国芯微电子系统有限公司 | Multiprocessor cooperative radiation source frequency parameter estimation device and method |
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