WO2018045566A1 - Procédé d'imagerie doppler d'angle de radar doppler à impulsions aléatoires fondé sur une détection compressée - Google Patents

Procédé d'imagerie doppler d'angle de radar doppler à impulsions aléatoires fondé sur une détection compressée Download PDF

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Publication number
WO2018045566A1
WO2018045566A1 PCT/CN2016/098598 CN2016098598W WO2018045566A1 WO 2018045566 A1 WO2018045566 A1 WO 2018045566A1 CN 2016098598 W CN2016098598 W CN 2016098598W WO 2018045566 A1 WO2018045566 A1 WO 2018045566A1
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doppler
space
time
angle
clutter
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PCT/CN2016/098598
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English (en)
Chinese (zh)
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阳召成
全桂华
黄建军
黄敬雄
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深圳大学
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Priority to PCT/CN2016/098598 priority Critical patent/WO2018045566A1/fr
Publication of WO2018045566A1 publication Critical patent/WO2018045566A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
    • G01S13/88—Radar or analogous systems specially adapted for specific applications
    • G01S13/89—Radar or analogous systems specially adapted for specific applications for mapping or imaging

Definitions

  • the invention belongs to the field of radar signal processing, and more particularly to a random pulse Doppler radar angle-Doppler imaging method based on compressed sensing.
  • STAP Space-Time Adaptive Processing
  • ACP Auxiliary Channel Processor
  • PC Principal Components
  • JDL Joint Domain Localized
  • MTF Multistage Winer Filter
  • a series of dimensionality reduction or descending rank algorithms such as the Auxiliary Eigen Vector Processor (AEP) reduces the number of samples required to 2 times the dimension after dimensionality reduction or the number of wavelet ranks after 2 times the reduced rank.
  • AEP Auxiliary Eigen Vector Processor
  • the sparse-based STAP algorithm proposed to improve the convergence of the system is based on the sparse property of the clutter power spectrum in the angle-Doppler domain, and the sparse recovery algorithm is used to reconstruct the clutter of the Doppler.
  • the image is thus estimated to estimate the clutter covariance matrix, and then the space-time filter is designed to achieve the purpose of clutter suppression and target detection.
  • Most existing sparse-based STAP algorithms are implemented in spatial and Doppler dimensions in a uniform sampling manner.
  • PRF uniform pulse repetition frequency
  • array element array modes are inevitable. Problems such as Doppler or distance blur will eventually lead to system clutter suppression and target detection performance degradation.
  • the uniform pulse transmission mode Doppler radar emission waveform is easy to be intercepted, and the anti-interference ability is poor.
  • the object of the present invention is to provide a method for random pulse Doppler radar angle-Doppler imaging based on compressed sensing, aiming at solving the uniform pulse transmitting Doppler radar in the prior art.
  • the transmit waveform is easily intercepted and has poor anti-interference ability, while improving the target processing capability in a single coherent processing time interval.
  • the invention provides a method for random pulse Doppler radar angle-Doppler imaging based on compressed sensing, comprising the following steps:
  • S1 obtaining space-time compressed sampling data based on a radar system
  • S3 Estimating the space-time power spectrum according to the space-time guiding dictionary, and obtaining an angle-Doppler image including the clutter and the target.
  • T m+1 is the pulse emission time of the index m+1
  • m is the pulse index
  • T r is the uniform pulse repetition period
  • ⁇ is the offset factor
  • t m is the random factor of the index m
  • B(0,T r ) obeys the Bernoulli distribution in the range of (0,T r ).
  • the space-time guidance dictionary is represented by the matrix ⁇ ; wherein Clutter space-time snapshot of the complex amplitude on the angle-Doppler domain
  • v(f d,i , f s,j ) is the space-time steering vector
  • f d,i is the Doppler frequency
  • f s , j is the spatial frequency
  • ⁇ c i, j is the complex amplitude of the clutter in the angle-Doppler plane grid
  • i 1,...
  • N d is the Doppler frequency partition index
  • N d is the number of Doppler frequency divisions
  • N s is the number of spatial frequency divisions.
  • the whole angle-Doppler plane is divided into N s N d grids; where ⁇ d , ⁇ s represent the resolution scale of the Doppler frequency and the spatial frequency, respectively, f s is the normalized spatial frequency range, N is The number of receiving arrays, f d is the Doppler frequency range, and f r is the maximum unambiguous Doppler frequency.
  • the method for realizing angle-Doppler imaging based on the radar system has the following advantages: (1) effectively solving the target, the clutter Doppler blur problem, and improving the miscellaneous Wave suppression and target detection performance; (2) reduce the number of pulses emitted by the radar system, can transmit other radar waveforms in the same pulse coherent processing interval (CPI) or simultaneously observe multiple angles, thereby effectively improving the radar time dimension The multiplexing capability; (3) can effectively improve the Doppler resolution capability under the same number of pulses; (4) the low interception capability of the radar waveform, and the stronger anti-interference ability.
  • CPI pulse coherent processing interval
  • FIG. 1 is a flow chart of a method for implementing a compressed pulse-based random pulse Doppler radar angle-Doppler imaging according to the present invention
  • Figure 2 is a plot of the degree of defuzzification versus the parameter factor ⁇ ;
  • FIG. 3 is an angle-Doppler imaging diagram obtained by different compression ratios in a pulse dimension; wherein (a) is a compression ratio of 1:2, (b) is a compression ratio of 1:3, and (c) is a compression ratio of 1: 4, (d) is a compression ratio of 1:6;
  • Figure 4 is a schematic diagram of angle-Doppler imaging obtained by Doppler radar, where (a) is an angle-Doppler imaging diagram obtained by a uniform PRF radar, and (b) is an angle-Doppler imaging obtained by a random PRF radar. schematic diagram.
  • the invention proposes a stochastic PRF pulse Doppler radar system based on compressed sensing from the perspective of solving the problem of pulse Doppler ambiguity, improving the practical value of the system and the anti-interference ability of the system. Due to the introduction of random pulses, the Doppler ambiguity can be effectively eliminated and the interception capability of the radar waveform can be reduced. Since the number of transmitted pulses is reduced, the practical value of the system can be effectively improved, and multiple groups can be transmitted in one CPI time. Radar waveforms or simultaneous observation of multiple angles can improve the multiplexing ability of the radar time dimension.
  • the method for compressive sensing based random pulse Doppler radar angle-Doppler imaging comprises the following steps:
  • S1 obtaining space-time compressed sampling data based on a random pulse Doppler radar system under compressed sampling
  • Process 1 based on a random pulsed Doppler frequency radar system under compressed sampling, obtaining space-time compressed sampling data;
  • the traditional pulse Doppler radar system transmits M equally spaced pulse sequences (period T r ) in one CPI period.
  • the thermal noise component, N is the number of receiving antenna elements.
  • v dt (f dt ) [1,exp(j2 ⁇ f dt T 1 )...,exp(j2 ⁇ f dt T M-1 )] T ,
  • v st (f st ) [1,exp(j2 ⁇ f st ),...,exp(j2 ⁇ (N-1)f st )] T ,
  • the clutter component can be expressed as: among them They are the complex amplitude, time and space steering vectors of the i-th clutter block on the interest distance loop, and N c is the number of independent clutter blocks in the interest distance clutter loop.
  • NK ⁇ NM NK ⁇ 1
  • H H
  • ⁇ the sampling matrix and the measurement matrix, respectively
  • I N an N ⁇ N unit matrix
  • Process 2 Design a space-time oriented dictionary to complete the sparse representation of the signal.
  • the clutter space-time snap signal can be expressed as:
  • v(f d,k ,f s,i ), f d,k ,f s,i are the space-time guided vectors of the ki discrete points of the entire angle-Doppler plane, and the discretized Doppler Frequency, normalized spatial frequency.
  • Process 3 Estimating the space-time power spectrum to achieve angle-Doppler imaging.
  • the angle containing the clutter and the target - the Doppler image ⁇ can be estimated by solving the optimization problem of the following formula Subject to among them, Indicates the l p norm, ⁇ e is the noise error allowed.
  • the angle-Doppler image can be estimated Express And
  • the beneficial effects of the newly proposed radar system in the present invention will be analyzed from the following two points: First, the Doppler ambiguity (including target Doppler ambiguity and clutter Doppler ambiguity) under the radar system is analyzed. Secondly, the angle-Doppler image recovery performance based on Doppler-dimensional compression sampling is analyzed.
  • P b and P r represent the sum of the energy powers of all clutter blocks in the clutter fuzzy region and the clutter ridge region on the angle-Doppler plane, respectively.
  • the graph reflects the relationship between the degree of defuzzification and the different parameters ⁇ .
  • the appropriate parameter selection range such as 0.3 ⁇ ⁇ ⁇ 0.7
  • the sum of the powers of all the clutter blocks in the fuzzy region is better.
  • the clutter Doppler blur (as well as the target Doppler blur) is basically eliminated.
  • complete de-fuzzing of Doppler is not possible.
  • the invention relates to radar signal processing and ground moving target detection, and proposes a random impulse Doppler array radar based on compressed sensing, which constructs a clutter containing according to the sparse characteristics of the clutter or target in the angle-Doppler domain.
  • the angle of the target - the sparse recovery problem of the Doppler image, the angle-Doppler image is obtained by solving the problem, which provides a basis for subsequent target detection.
  • the introduction of random pulses can effectively eliminate the Doppler blur; because the number of transmitted pulses is reduced, the radar waveform interception capability is reduced, and multiple sets of radar waveforms are transmitted in one CPI. Or observing multiple angles at the same time, improving the multiplexing ability of the radar time dimension.

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  • Engineering & Computer Science (AREA)
  • Remote Sensing (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • General Physics & Mathematics (AREA)
  • Radar Systems Or Details Thereof (AREA)

Abstract

L'invention concerne un procédé d'imagerie Doppler d'angle de radar Doppler à impulsions aléatoires fondé sur une détection compressée consistant : S1, à obtenir des données d'échantillonnage compressées d'espace-temps en fonction d'un système radar ; S2, à réaliser respectivement un traitement de discrétisation spatiale sur un espace de fréquence Doppler et une fréquence spatiale dans les données d'échantillonnage compressées d'espace-temps et à obtenir un dictionnaire orienté espace-temps ; et S3, à estimer un spectre de puissance d'espace-temps en fonction du dictionnaire orienté espace-temps et à obtenir une image d'angle-Doppler comportant un fouillis et une cible. Le problème de l'ambiguïté Doppler de cible et de fouillis est résolu efficacement, la suppression de fouillis et la performance de détection de cible sont améliorées ; le nombre d'impulsions transmises par un système radar est réduit et d'autres formes d'onde radar peuvent être transmises ou des angles multiples peuvent être observés en même temps à un même intervalle de traitement cohérent d'impulsion, ce qui permet d'améliorer efficacement la capacité de multiplexage de dimension temporel d'un radar ; au même nombre d'impulsions, la capacité de résolution Doppler peut être efficacement améliorée ; les capacités d'interception basse et de capture de forme d'onde de radar et la capacité de résistance au brouillage sont plus fortes.
PCT/CN2016/098598 2016-09-09 2016-09-09 Procédé d'imagerie doppler d'angle de radar doppler à impulsions aléatoires fondé sur une détection compressée WO2018045566A1 (fr)

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