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Interferometer direction-finding-based LFMCW radar multi-target detection method

A detection method and interferometer technology, which can be used in the orientation device, instrument, measuring device and other directions of the determination direction, and can solve the problem of difficult spectrum matching

Active Publication Date: 2020-02-28
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a LFMCW radar multi-target detection method based on interferometer direction finding. On the basis of sending symmetrical triangular linear frequency modulation continuous wave, adding interferometer direction finding technology, it solves the problem of scanning up and down frequency band spectrum under multi-target conditions. The problem of difficult pairing improves the reliability of multi-target detection

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  • Interferometer direction-finding-based LFMCW radar multi-target detection method

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Embodiment

[0130] The central frequency f of the transmitted signal of the radar in this simulation experiment is 0 =125.4GHz, frequency sweep bandwidth B=1.2GHz, coherent processing interval T CPI =100μs, direction finding range is -60°~60°, velocity measuring range is -1000m / s~1000m / s, corresponding Doppler frequency range is -836KHz~836KHz, inter-channel phase difference measurement error Direction finding accuracy Δθ=1°, according to the requirements of the longest baseline and the shortest baseline in the above Chinese formulas (3) and (4), take d max = 8mm, d min = 1 mm. Then, according to the requirements of the deblurring multiple above, the real baseline deblurring multiple K can be obtained 1 ≤11, virtual baseline to solve the real baseline fuzzy multiple K 3 ≤5.5. The baseline lengths of the three antenna elements are respectively d 1 = d min , d 2 =md 1 , d 3 =(m+1)d 1 , d 4 =(2m+1)d 1 = d max . The solution is m=3.5, which satisfies the condition of defuzzifi...

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Abstract

The invention discloses an interferometer direction-finding-based LFMCW radar multi-target detection method. The detection method comprises the following steps that the lengths of three real baselinesand a virtual baseline of an interferometer are determined; acquisition and processing of three-channel radar echo signals are carried out; after fast Fourier transform is carried out, the frequencyspectrums of upper and lower frequency sweep difference beating signals of the three channels are subjected to periodogram accumulation, and then the accumulated spectrums are subjected to constant false alarm detection; spectrum peaks of the upper frequency sweep band and the lower frequency sweep band are paired to obtain a spectral peak pairing matrix, and the angle difference, the Doppler frequency and the normalized amplitude difference of each pair of spectral peaks in the matrix are calculated; the matrix is screened by using the angle difference, the Doppler frequency and the normalized amplitude difference; and the distance and speed of a target are calculated for the completely paired spectrum peaks. According to the method, false targets appearing in the upper and lower frequency sweep pairing of the triangular modulation LFMCW can be reduced, the reliability of multi-target detection is improved, and the distance, speed and angle information of multiple targets can be measured.

Description

technical field [0001] The invention belongs to the technical field of millimeter wave radar target detection, in particular to an LFMCW radar multi-target detection method based on interferometer direction finding. Background technique [0002] Linear frequency modulation continuous wave radar refers to a continuous wave radar in which the frequency of the transmitted signal increases or decreases linearly with time. The linear frequency modulation continuous wave radar obtains the distance information and speed information of the target by comparing the difference between the frequency of the echo signal and the frequency of the transmitted signal. Chirp continuous wave radar has a relatively large time-width-bandwidth product. Compared with pulse radar, it has the characteristics of small size, light weight, simple structure, low transmission power, high resolution and no blind zone. High-resolution detection occasions are more and more widely used. [0003] At present,...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/42G01S13/38G01S3/48G01S7/41
CPCG01S13/424G01S13/38G01S3/48G01S7/415
Inventor 张仁李黄垒盛卫星马晓峰韩玉兵
Owner NANJING UNIV OF SCI & TECH
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