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Multi-target detection method based on variable carrier frequency modulation sequence

A detection method and multi-target technology, applied in the direction of measuring device, radio wave measurement system, radio wave reflection/re-radiation, etc., can solve the problems of Doppler frequency ambiguity and Doppler frequency difference, and achieve the solution of Doppler frequency Le frequency fuzzy, to ensure the effect of high-precision distance measurement and speed measurement

Active Publication Date: 2018-05-25
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Problems solved by technology

In this method, the Doppler frequency difference caused by different carrier frequencies can solve the problem of Doppler frequency ambiguity and realize high-precision multi-target detection

Method used

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  • Multi-target detection method based on variable carrier frequency modulation sequence
  • Multi-target detection method based on variable carrier frequency modulation sequence
  • Multi-target detection method based on variable carrier frequency modulation sequence

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Embodiment Construction

[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0040] Such as figure 1 , figure 2 Shown is a schematic flow chart of the present invention.

[0041] Step 1: The radar transmits an FM sequence signal, each cycle contains 2 FM sawtooth waves with different carrier frequencies, and the carrier frequency of the first FM sawtooth wave signal is f 01 , the bandwidth is B, and the frequency modulation period is T m , the carrier frequency of the second FM sawtooth wave signal is f 02 , the bandwidth is B, and the frequency modulation period is T m , the frequency difference of the carrier frequency is Δf, Δf=f 02 -f 01 , to continuously acquire received signals of L periods;

[0042] Step 2: Mix the received signal down to the baseband to obtain a beat signal of L periods, and perform discrete sampling. The specific form of the signal after discrete sampling is:

[0043] the s 1 (n,l)=e...

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Abstract

The invention relates to a multi-target detection method based on a variable carrier frequency modulation sequence. The method includes the following steps: emitting a variable carrier frequency modulation sequence with waveforms, each period including two frequency modulation sawtooth waves and a carrier frequency difference being [delta]f; continuously obtaining reception signals of L periods, conducting down frequency mixing on the signals to a base band, and carrying out discrete sampling; setting the number of frequency modulation sawtooth wave sampling points during each period as N, andstoring the sawtooth waves at different carrier frequencies as a matrix S1 and a matrix S2, S1 and S2 each including L rows and N columns; conducting NFFT point FFT on each row of the matrix S1 and the matrix S2 and obtaining a matrix SR1 and a matrix SR2; conducting LFFT point FFT on each column of the matrix SR1 and the matrix SR2 and obtaining a matrix SRD1 and a matrix SRD2; conducting two-dimensional constant false alarm detection on the matrix SRD1 and the matrix SRD2, and extracting beat frequencies fB1 and fB2 and fuzzy doppler frequencies fD,amb1 and fD,amb2 of targets; and on the basis of fD,amb1, fD,amb2 and the carrier frequency difference [delta]f, calculating the speed of the targets, and then obtaining high-precision distance information. The doppler frequency fuzzy problemcan be solved on the basis of a doppler frequency difference caused by different carrier wave frequencies, and then high-precision multi-target detection can be achieved.

Description

technical field [0001] The invention relates to the technical field of radar, in particular to a multi-target detection method based on variable carrier frequency FM sequence, which is especially suitable for high-precision multi-target detection of continuous wave radar. Background technique [0002] In a radar system, the choice of waveform type and signal processing technique depends largely on the specific mission and role of the radar. Considering the cost and complexity related to the implementation of software and hardware, radars in the civilian field usually choose the continuous wave system. Continuous wave system radar is suitable for the detection of a single target, but the basic requirement of automotive radar is to ensure that the distance and relative speed of multiple targets can be detected simultaneously in the case of multiple targets, and maintain high precision and high resolution. [0003] In recent years, relevant experts and scholars have successive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41G01S13/32G01S13/58
CPCG01S7/411G01S13/32G01S13/584
Inventor 杜劲松高洁王伟徐洪庆仝盼盼丛日刚李想张清石田星赵越南高扬
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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