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Signal processing method of variable-frequency compressed sensing radar

A signal processing and compressed sensing technology, applied in radio wave measurement systems, instruments, etc., can solve the problems of signal sparsity destruction and radar detection performance degradation.

Pending Publication Date: 2020-09-22
SUN YAT SEN UNIV
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  • Claims
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Problems solved by technology

This leads to the destruction of signal sparsity and the degradation of radar detection performance when the number of targets increases

Method used

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  • Signal processing method of variable-frequency compressed sensing radar
  • Signal processing method of variable-frequency compressed sensing radar
  • Signal processing method of variable-frequency compressed sensing radar

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[0089] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0090] refer to image 3 As shown, a signal processing method of frequency conversion compressive sensing radar provided by an embodiment of the present invention includes the following steps:

[0091] S10. Distinguish the pulses of different carrier frequencies from the pulses of the congruent number according to the sending order, and obtain multiple radar echo signals of a single carrier frequency;

[0092] S20. Perform sparse ...

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Abstract

The invention discloses a signal processing method of a variable-frequency compressed sensing radar, which comprises the steps of distinguishing pulses with the same remainder from pulses with different carrier frequencies according to a transmission sequence, and obtaining a plurality of radar echo signals with a single carrier frequency; performing sparse recovery processing on each group of echo signals with the same carrier frequency; carrying out post-processing on reconstruction processing results of the echo signals with different carrier frequencies; and voting by taking the data in the interval near the maximum value to obtain a final restored signal. According to the method, a random modulation frequency conversion radar target detection model based on compressed sensing is established by combining the thought of constant false alarm detection and compressed sensing radar signal reconstruction of a traditional radar. Meanwhile, a weighting algorithm of multiple paths of signals is provided by utilizing the random characteristics of the transmitted signals, so that a final restored signal is obtained, and the target detection of the variable-frequency compressed sensing radar under multiple targets can be realized.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a signal processing method of frequency conversion compressed sensing radar. Background technique [0002] Due to the excessive redundant information in the sampled signal and the spectral superposition problem caused by equidistant sampling, the traditional radar inevitably needs to deal with the blurring of the signal in the post-processing. The compressed sensing theory deeply describes the problem of signal sparsity and observation randomness in signal reconstruction. Therefore, applying compressive sensing theory to radar signal processing can solve the problems of signal redundancy and ambiguity at the same time. [0003] The above basic theory of compressed sensing: [0004] The traditional fast Fourier transform process is a process of forward calculation, that is, the process of directly performing fixed operations on the signal to obtain results, and i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/41
CPCG01S7/41
Inventor 许琦阳
Owner SUN YAT SEN UNIV
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