CN106130571A - A kind of signal sampling method of reseptance based on frequency domain and spatial domain compressed sensing and device - Google Patents

A kind of signal sampling method of reseptance based on frequency domain and spatial domain compressed sensing and device Download PDF

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Publication number
CN106130571A
CN106130571A CN201610435298.8A CN201610435298A CN106130571A CN 106130571 A CN106130571 A CN 106130571A CN 201610435298 A CN201610435298 A CN 201610435298A CN 106130571 A CN106130571 A CN 106130571A
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China
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signal
spatial domain
compressed sensing
attenuator
frequency
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CN201610435298.8A
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Chinese (zh)
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CN106130571B (en
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吴日恒
宋宜斌
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烟台大学文经学院
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/0003Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
    • H04B1/0007Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details 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
    • H04B1/06Receivers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842Weighted combining
    • H04B7/086Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming

Abstract

The invention discloses a kind of signal sampling method of reseptance based on frequency domain and spatial domain compressed sensing and device, the present invention can reduce radar, the high-speed ADC signal sampling acceptance rate of the broadband such as electronic reconnaissance and ultra-wideband communications application, its principle is to utilize the emitter Signals such as radar or ultra-wideband communications transmitter in the openness feature of frequency domain and spatial domain, devise tandem compressed sensing calculation matrix, this design not only reduces the sample rate of time domain broadband radiofrequency signal ADC, system design cost and system power dissipation are saved, feasible scheme is provided for signal storage and further analysis, and receiver channel number is also greatly reduced, reduce radar, electronic reconnaissance and ultra-wideband communication system design complexities.Meanwhile, signal reconstruction instead of the channelization scheme of routine.The receiver channel problem of inconsistency run in conventional design has obtained basic solution.

Description

A kind of signal sampling method of reseptance based on frequency domain and spatial domain compressed sensing and device

Technical field

The present invention relates to radar, electronic reconnaissance and wideband communication signal process field, particularly relate to a kind of based on frequency domain and The signal sampling method of reseptance of spatial domain compressed sensing and device.

Background technology

Conventional electrical reconnaissance system through frequently with phase-interferometer or spatial spectrum angle-measuring method to aerial/Ground emitter signals Carry out direction of arrival (DOA) estimate and/or position.Common workflow: Radar emitter radiofrequency signal is defeated through aerial array Enter, through receiver front end amplitude limit, LNA, filter and be mixed, (on) become intermediate-freuqncy signal output after down coversion, ADC adopts Do channelizing after sample, become baseband signal and be further processed.

Along with the fast development of Radar Technology, multifunctional novel radar continues to bring out, radar transmitter radiofrequency signal frequency Rate is more and more higher, and bandwidth is more and more wider, and to electronic reconnaissance system structure serious challenge, such as ADC sample rate is the highest, And the resolving power of ADC can not too low (general number of significant digit is not less than 8bit) because frequency-measurement accuracy and CFAR threshold value Noise Estimation of Mean precision both depends in arranging the number of significant digit of analog-digital converter, and resolving power is too low, and frequency-measurement accuracy is deteriorated, It is unfavorable for that DOA based on frequency measurement system estimates.False-alarm probability increases, and is unfavorable for that radar emitter signal detects.ADC technology Development can not infinitely cater to this demand, and usually can not make progress between sample rate and resolving power simultaneously because This can bring the great expense incurred on cost, and it is real that this just requires to use new method, new principle to solve electronic reconnaissance system physics Existing feasibility and a complexity difficult problem.

Although bandpass sample theory shows, as long as ADC sample rate meets more than or equal to twice signal bandwidth, it is not necessary to respect to Signal carrier frequency, so that it may recover primary signal without distortions, but for a wideband electronic reconnaissance system, putting of this condition Pine does not tackle the problem at its root.

If directly to radio frequency signal sampling, it is possible to solution high band, big bandwidth, low noise wideband radar signal are detectd Receive, sample, the rigors such as storage, compressive sensing theory is that direct RF sampling provides theoretical foundation, and its principle is profit With openness in frequency domain of radar emitter signal, realized with relatively low sampling rate with regard to restructural by structure frequency domain measurement matrix Frequency-region signal purpose, the realization for wideband electronic reconnaissance system provides feasible scheme.But, this time receiver channel Complexity is the most at a relatively high, and conditional electronic reconnaissance system antenna receives unit and receiver channel one_to_one corresponding, along with antenna number Mesh rolls up, and receiver channel number increases therewith, and system cost and complexity are day by day serious, and such as spatial spectrum angle measurement uses big Scale linear array, angle measurement accuracy is at a relatively high, but brings receiver and designs excessively challenge.

Summary of the invention

In view of this, the invention provides a kind of signal sampling method of reseptance based on frequency domain and spatial domain compressed sensing and dress Put, reduce digital receiver port number while ADC sample rate can be reduced, greatly reduce system design cost.

There is advantages that

(1) present invention uses the form that frequency domain compressed sensing matrix is connected with spatial domain compressed sensing calculation matrix, right Radiofrequency signal carries out the compression of frequency domain and spatial domain, and wherein, after the compression of frequency domain, ADC sample rate becomes originally adopting M/N times of sample rate, has saved system design cost and system power dissipation, provides feasibility side for signal storage and further analysis Case;After spatial domain is compressed, digital receiver port number becomes original m/n times, significantly reduces system complexity.

Accompanying drawing explanation

Fig. 1 is the flow chart of the sampling method of reseptance of the present invention.

Fig. 2 be the frequency domain compressed sensing calculation matrix of the present invention realize schematic diagram of device.

Fig. 3 be the spatial domain compressed sensing calculation matrix of the present invention realize schematic diagram of device.

Detailed description of the invention

Develop simultaneously embodiment below in conjunction with the accompanying drawings, describes the present invention.

Radar emitter signal brings hope the openness of spatial domain for compressed sensing structure low complex degree receiver, Establish theoretical basis for building low cost wide having electronic reconnaissance system, used less receiver channel to realize high accuracy DOA and estimate Meter.

Signal is the foundation constructing compressed sensing calculation matrix dimension size at the degree of rarefication of not same area, the determination of degree of rarefication Needing combined with concrete application background, it determines that method can be achieved by the prior art.We assume that radar emitter signal Degree of rarefication in frequency domain and spatial domain is it is known that the present invention proposes a kind of signal sampling recipient based on frequency domain and spatial domain compressed sensing Method, as it is shown in figure 1, comprise the steps:

Step 1, each road radiofrequency signal received for n antenna element in reception system, carry out frequency domain pressure respectively Contracting perception processes, and obtains the n road radiofrequency signal after frequency compression;Wherein, it is M that employing has row vector, and column vector is the frequency of N Territory compressed sensing calculation matrix carries out frequency compression, and M ≈ 3K, K are the target degree of rarefication in frequency domain;N is number of samples;

N road radiofrequency signal after step 2, the frequency compression obtained for step 1, sends into spatial domain compressed sensing and measures square Carry out spatial domain compression in Zhen, obtain the m road radiofrequency signal after spatial domain is compressed;Wherein, described spatial domain compressed sensing The row vector of calculation matrix is m, and column vector is n, m ≈ 3H, and H is the target degree of rarefication in spatial domain;

M road radiofrequency signal after spatial domain is compressed is sampled by step 3, m Sampling Machine of employing respectively;

M road radiofrequency signal after sampling is received by step 4, m receiver of employing respectively, is achieved in adopting of signal Sample receives process.

In FIG, electronic reconnaissance system covering frequence scope is fL-fH, the system that receives uses n antenna element, receives N road radiofrequency signal x (t).The frequency-domain sparse degree assuming radar emitter signal is K, then frequency domain compressed sensing calculation matrix A ∈ RM ×NRow vector meet M ≈ 3K, due to K < < N, therefore, M < < N, N are to exist the radiofrequency signal not carrying out frequency domain compression The number of samples of ADC in unit interval, M is that the radiofrequency signal to frequency domain compression is within the same unit interval after compression sampling ADC number of samples.It is x (t) that n road antenna receives the radiofrequency signal of unit input, then through frequency domain compressed sensing calculation matrix A After, becoming n road radiofrequency signal y (t)=Ax (t), ADC sample rate is M/N times of original sample rate, and sample rate greatly reduces.

Again after spatial domain compressed sensing calculation matrix, n road radiofrequency signal y (t) surveys through spatial domain compressed sensing again Moment matrix B ∈ Rm×nAfter, become m road radiofrequency signal output z (t)=By (t)=BAx (t), wherein, m ≈ 3H, H represent that target exists The degree of rarefication of spatial domain.Due to H < < n, then m < < n, now digital receiver port number becomes original m/n times, significantly subtracts Having lacked receiver channel number, Receiver Complexity is greatly lowered.Signal reconstruction in diagram 1 realizes frequency domain sparse signal weight Structure, channelization scheme is realized by signal reconstruction, saves channelization scheme conventional in conventional electrical reconnaissance system, through numeral LNA, filtering, (on) eventually become baseband signal subsequent treatment after down coversion.

Signal reconstruction instead of channelization scheme in conventional electrical reconnaissance system;Channelizing side in conventional electrical reconnaissance system Case is substantially transformed into frequency domain time-domain sampling signal, and frequency-region signal is carried out frequency sweep, to determine which emitter Signals is positioned at In individual sub-band.The receiver channel problem of inconsistency run in conventional electrical reconnaissance system has obtained basic solution.Because Traditional electronic reconnaissance system uses multi-passage design scheme to realize a certain function mostly, and usual flow process is antenna radio-frequency signal warp After crossing broadband receiver, exporting after radiofrequency signal is transformed into intermediate-freuqncy signal, at this time radiofrequency signal bandwidth drops to high-speed ADC During the scope that sample rate can accept, starting to perform ADC sampling, this is conventional method, actually in conventional scheme, and Duo Gejie Receiving passage and have employed a large amount of analog device, being not exclusively digital receiver, so bringing the amplitude phase unbalance problem of signal.And The direct sampling plan of new radio frequency, then use all-digital receiver, there is not multichannel amplitude phase unbalance sex chromosome mosaicism, other link The error introduced can be ignored, such as sample quantization error etc..

Present invention also offers the realization dress of frequency domain compressed sensing calculation matrix and spatial domain compressed sensing calculation matrix Put, as shown in Figure 2, it is achieved the device of frequency domain compressed sensing calculation matrix, including M × N number of attenuator and M+1 addition Device;Representing attenuator, ∑ () represents adder;The input of each attenuator all receives the radiofrequency signal on place road;M× N number of attenuator is divided into M group, output one adder of termination of the N number of attenuator often organized, M group attenuator correspondence M addition Device, another one adder is connected on the outfan of this M adder.I-th tunnel radiofrequency signal xi(t) be input to parallel M × N number of by In the structured LDPC binary measure matrix that attenuator array is constituted, " focusing " of output signal is by first adder of diagram Realizing, second adder achieves frequency domain compressed sensing calculation matrix totally " focusing ", yi(t)=AxiT () is the i-th road radio frequency Signal exports.

As shown in Figure 3, it is achieved the device of spatial domain compressed sensing calculation matrix, add including m × n attenuator and m Musical instruments used in a Buddhist or Taoist mass;Representing attenuator, ∑ () represents adder;M × n attenuator is divided into m group, and often group has n attenuator;Its In, the equal one_to_one corresponding of n attenuator in any one group receives the n road radiofrequency signal after frequency compression, often organizes attenuator Outfan connects an adder jointly.M it is input to parallel by n road radiofrequency signal y (t) of frequency domain compressed sensing calculation matrix output In × n attenuator, the row vector of LDPC binary measure matrix B is made up of n attenuator, after " multiply-add " computing, exports m Road analog radio-frequency signal z (t).Analog radio frequency after frequency domain compressed sensing calculation matrix and spatial domain compressed sensing calculation matrix Signal z (t), then after m road ADC samples, not only ADC sample rate reduces, and receiver channel number decreases, but DOA estimated accuracy is unaffected.

In sum, these are only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention. All within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. made, should be included in the present invention's Within protection domain.

Claims (3)

1. a signal sampling method of reseptance based on frequency domain and spatial domain compressed sensing, it is characterised in that comprise the steps:
Step 1, each road radiofrequency signal received for n antenna element in reception system, carry out frequency domain compression sense respectively Know process, obtain the n road radiofrequency signal after frequency compression;Wherein, it is M that employing has row vector, and column vector is the frequency domain pressure of N Contracting perception calculation matrix carries out frequency compression, and M ≈ 3K, K are the target degree of rarefication in frequency domain;N is number of samples;
N road radiofrequency signal after step 2, the frequency compression obtained for step 1, sends in spatial domain compressed sensing calculation matrix Carry out spatial domain compression, obtain the m road radiofrequency signal after spatial domain is compressed;Wherein, described spatial domain compressed sensing is measured The row vector of matrix is m, and column vector is n, m ≈ 3H, and H is the target degree of rarefication in spatial domain;
M road radiofrequency signal after spatial domain is compressed is sampled by step 3, m Sampling Machine of employing respectively;
M road radiofrequency signal after sampling is received by step 4, m receiver of employing respectively, and the sampling being achieved in signal connects Receipts process.
2. the dress of the frequency domain compressed sensing calculation matrix in the signal sampling method of reseptance that a kind realizes described in claim 1 Put, it is characterised in that include M × N number of attenuator and M+1 adder;The input of each attenuator all receives place frequency The radiofrequency signal that rate territory compressed sensing calculation matrix is corresponding;M × N number of attenuator is divided into M group, the N number of attenuator often organized defeated Going out one adder of termination, M group attenuator correspondence M adder, another one adder is connected on the output of this M adder End.
3. the dress of the spatial domain compressed sensing calculation matrix in the signal sampling method of reseptance that a kind realizes described in claim 1 Put, it is characterised in that include m × n attenuator and m adder;M × n attenuator is divided into m group, and often group has n Attenuator;Wherein, the equal one_to_one corresponding of n attenuator in each group receives the n road radiofrequency signal after frequency compression, often organizes decay The outfan of device connects an adder jointly.
CN201610435298.8A 2016-06-07 2016-06-07 A kind of signal sampling method of reseptance and device based on frequency domain and airspace compressed sensing CN106130571B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103117818A (en) * 2013-01-16 2013-05-22 南京邮电大学 Broadband spectrum sensing method based on space-frequency joint compressed sensing
US9015007B2 (en) * 2010-12-13 2015-04-21 Southwest Research Institute Sensor array processor with multichannel reconstruction from random array sampling
CN105158735A (en) * 2015-06-03 2015-12-16 西安电子科技大学 Space frequency two-dimensional spectrum estimation method based on compressed sampling array

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9015007B2 (en) * 2010-12-13 2015-04-21 Southwest Research Institute Sensor array processor with multichannel reconstruction from random array sampling
CN103117818A (en) * 2013-01-16 2013-05-22 南京邮电大学 Broadband spectrum sensing method based on space-frequency joint compressed sensing
CN105158735A (en) * 2015-06-03 2015-12-16 西安电子科技大学 Space frequency two-dimensional spectrum estimation method based on compressed sampling array

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