Linear frequency modulation radar signal processing method based on compressed sensing

A technology of radar signal processing and linear frequency modulation, which is applied in the direction of radio wave measurement systems and instruments, can solve the problems of not being suitable for the practical application of radar, no echo signal compression, etc., and achieve the goal of reducing the sampling rate, reducing the amount of data, and realizing compression Effect

Active Publication Date: 2017-08-18
NANJING UNIV OF SCI & TECH
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(See "UWB Echo Signal Detection With Ultra-Low Rate Sampling Based on Compressed Sensing" published in Circuits & Systems II Express Briefs IEEE Transactions on, 2008, 55(4): 379-383.) However, this sparse representation needs to be based on the radar The adjustment of the observation dist

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  • Linear frequency modulation radar signal processing method based on compressed sensing
  • Linear frequency modulation radar signal processing method based on compressed sensing
  • Linear frequency modulation radar signal processing method based on compressed sensing

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[0063] The present invention will be further described in detail below in conjunction with the accompanying drawings and example simulation situations.

[0064] The present invention is a linear frequency modulation radar signal processing method based on compressed sensing, which proposes a preprocessing method of deskewing processing for linear frequency modulation signals, establishes a sparse model of LFM echo signals, and realizes radar echo signal processing based on compressed sensing, which is finally accurate Get target information. Such as figure 1 As shown, it is an implementation flowchart of a method for processing chirp radar signals based on compressed sensing in the present invention, which specifically includes the following four steps:

[0065] (1) The radar transmits a chirp signal, and after being reflected by the target, the radar echo signal is preprocessed, that is, the echo signal is de-skewed, and the received radar echo signal and the local oscillato...

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Abstract

The invention discloses a linear frequency modulation radar signal processing method based on compressed sensing. The method comprises the steps of (1) emitting a linear frequency modulation signal to a radar and preprocessing an echo signal, which means that the deramping processing of the echo signal is carried out, a difference frequency signal is outputted, and a signal model of deramping processing is established in a time domain, (2) according to the sparsity of the difference frequency signal in a frequency domain, constructing a sparse conversion matrix, and establishing a sparse representation model of the radar echo signal, (3) constructing a measurement matrix, and realizing the projection transformation of a difference frequency sparse signal to a low dimensional space, and (4) using an orthogonal matching pursuit (OMP) algorithm, reconstructing a radar difference frequency signal, and efficiently obtaining target information. Accoding to the method, the compression of radar echo signal data can be fundamentally realized, the change of a sparse model according to a radar observation distance is not needed, finally the target information is obtained, and the method is suitable for the echo signal processing of an actual radar.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, is a method for realizing radar echo signal processing based on compressed sensing for linear frequency modulation signals, and is suitable for actual radar signal processing. Background technique [0002] Radar typically improves resolution by emitting broadband or ultra-wideband signals. Linear Frequency Modulation (LFM) pulse signal is the earliest and most widely used form of radar signal. The transmission of broadband LFM pulse signal has caused great pressure on the data acquisition, transmission, storage and real-time processing of the radar system. [0003] In 2004, Donoho, Candes and Tao et al. proposed the theory of Compressive Sensing (CS), which is a brand-new signal acquisition and processing theory, which realizes signal compression in the process of signal sampling at the same time, which is much lower than that of Nyquist. Sampling at the highest sampling rate and...

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Application Information

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IPC IPC(8): G01S7/292
CPCG01S7/292
Inventor 张非非宋耀良管司慧穆童范事成
Owner NANJING UNIV OF SCI & TECH
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