SAR moving target detection method based on adaptive Chirp decomposition

A moving target detection and self-adaptive technology, applied in measurement devices, radio wave measurement systems, radio wave reflection/re-radiation and other directions, can solve the problem of inaccurate multi-target parameter estimation, achieve fast convergence speed and easy hardware implementation , Detect the effect of stable valuation results

Inactive Publication Date: 2017-04-26
HARBIN INST OF TECH
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AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of inaccurate estimation of multi-target parameters in the existing WVD technology, and propose a SAR moving target detection method based on adaptive Chirp decomposition

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  • SAR moving target detection method based on adaptive Chirp decomposition
  • SAR moving target detection method based on adaptive Chirp decomposition
  • SAR moving target detection method based on adaptive Chirp decomposition

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specific Embodiment approach 1

[0019] Embodiment 1: The specific process of a SAR moving target detection method based on adaptive Chirp decomposition in this embodiment is as follows:

[0020] Step 1. Preprocessing the SAR echo to obtain a preprocessing result;

[0021] Step 2, performing adaptive chirp decomposition on the preprocessing result to obtain the decomposition result;

[0022] Step 3, perform time-frequency reconstruction according to the decomposition result, and obtain the time-frequency reconstruction result;

[0023] Step 4: Detect the target according to the reconstruction result, and obtain the detection target result;

[0024] As mentioned above, SAR is a synthetic aperture radar, and chirp is a chirp signal.

specific Embodiment approach 2

[0025] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the SAR echo is preprocessed in the step one, and the preprocessing result is obtained; the specific process is:

[0026] Taking the ground coordinate system (x-y-z) as the reference coordinate system, without considering the rotation of the earth, figure 1 The SAR geometric characteristics of moving targets are drawn.

[0027] Assume that the radar is in the working state of looking sideways, and the flying speed of the carrier aircraft is v a , at time t=0, the carrier coordinates are (0,0,h), and the ground moving target P is located at (x 0 ,y 0 ,0), let the position of the ground moving target P at time t=0 be its true position; the distance from point P of the ground moving target to the flight route of the carrier aircraft is R c , The slant distance from the ground moving target P to the carrier aircraft is R 0 , The speed and acceleration of the ground moving...

specific Embodiment approach 3

[0042] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that in the step 2, adaptive chirp decomposition is performed on the preprocessing result to obtain the decomposition result; the specific process is:

[0043] Treat the preprocessing result s(t) obtained in step 1 as n chirp wavelet bases g i (t) linear superposition, namely:

[0044]

[0045]

[0046] Among them, σ i , t i , ω i , β i represent the width, time center, initial frequency and modulation frequency of the i-th chirp wavelet base respectively, and n is the chirp wavelet base g i The number of (t), the value is a positive integer; c i is the coefficient of the i-th chirp wavelet base;

[0047] g i The WVD distribution of (t) is expressed as: WVD is a Wigner-Willi distribution;

[0048]

[0049]

[0050] Get the chirp wavelet base g i The WVD distribution of (t) is concentrated on a straight line, so that ω is the initial frequency of the chirp wavelet base; th...

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Abstract

A SAR (Synthetic Aperture Radar) moving target detection method based on the adaptive Chirp decomposition is provided by the invention. The present invention relates to a SAR moving target detection method based on the adaptive Chirp decomposition. The objective of the invention is to solve the problem that the multi-target parameter estimation is inaccurate by employing the current WVD technology. The method concretely comprises the steps: the step 1, performing preprocessing of the SAR echo to obtain a preprocessing result; the step 2, performing adaptive Chirp decomposition to obtain a decomposition result; the step 3, performing time-frequency reconfiguration according to the decomposition result; and the step 4, detecting a target according to the reconstruction result, and obtaining a detection target result. The SAR moving target detection method based on the adaptive Chirp decomposition is used for the SAR moving target detection field.

Description

technical field [0001] The invention relates to a SAR moving target detection method based on adaptive Chirp decomposition. Background technique [0002] Synthetic Aperture Radar (SAR) is a high-resolution, two-dimensional imaging radar, which uses pulse compression technology to achieve high resolution in the range dimension, and high resolution in azimuth through synthetic aperture. Following the in-depth development of conventional imaging technology, its detection of moving targets has become a major aspect of current SAR technology research. [0003] The echo of a ground moving target can approximate a chirp signal (Chirp signal), so it can be considered that the detection of a ground moving target is the detection of a chirp signal in the background of noise and clutter. Considering the good aggregation of chirp signals in the time-frequency domain, time-frequency methods for parameter estimation can be used, such as Radon-Wigner transform (RWT), Radon-Ambiguity trans...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S13/90
CPCG01S13/9029
Inventor 王照法王勇谢俊好李绍滨张庆祥李高鹏
Owner HARBIN INST OF TECH
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