Multichannel SAR (synthetic aperture radar) mobile object localization method on the basis of fuzzy-c-mean algorithm
A technology of mean value algorithm and positioning method, which is applied in the field of radar, can solve the problems such as the inability to obtain the membership degree information of moving targets, the inability to realize the accurate extraction of moving target positioning interference phase, etc., and achieve the effect of improving consistency
Active Publication Date: 2014-07-23
XIDIAN UNIV
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[0004] The purpose of the present invention is to provide a multi-channel SAR moving target precise positioning method based on the fuzzy c-means algorithm, so as to solve the problem that the prior art cannot obtain the membership degree information of the moving target and cannot realize the accurate extraction of the interferometric phase required for moving target positioning question
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[0025] refer to figure 1 , the implementation steps of the present invention are as follows:
[0026] Step 1: Perform a channel equalization operation on each channel receiving the radar echo signal to improve the consistency of the amplitude and phase characteristics between different channels.
[0027] (1a) Perform two-dimensional Fourier transform on the radar echo signals of each channel to transform them into the two-dimensional frequency domain, and then perform polynomial fitting on the amplitude and phase errors of the signals respectively, and analyze the signals caused by inconsistent channel characteristics. The amplitude and phase characteristic difference is compensated once;
[0028] (1b) Perform an inverse Fourier transform on the echo signals of each channel after a compensation of the amplitude-phase characteristic difference to make it transform into the range-Doppler domain, and perform polynomial fitting on the amplitude and phase errors of the signal agai...
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The invention discloses a multichannel SAR (synthetic aperture radar) mobile object localization method on the basis of the fuzzy-c-mean algorithm. The multichannel SAR mobile object localization method on the basis of the fuzzy-c-mean algorithm mainly solves the problem that membership degree of mobile targets cannot be acquired in the prior art, correct interference phase extraction cannot be realized and target localization is inaccurate. The multichannel SAR mobile object localization method on the basis of the fuzzy-c-mean algorithm includes steps of firstly, subjecting different channels receiving radar echo signals to channel balancing operation; secondly, respectively subjecting radar echo data of each channel to imaging processing to obtain SAR images of the channels and performing image registration and clutter offset; thirdly, detecting the images subjected to clutter offset by means of constant false alarm detection and obtaining coordinates of a target position; fourthly, utilizing the obtained coordinates of the target position as samples to be clustered, clustering the samples to be cluster by means of fuzzy-c-mean algorithm and obtaining cluster center and membership degree information; and fifthly, localizing the target to the real position according to interference phase and cluster center extracted according to the membership information. The multichannel SAR mobile object localization method is high in practicality and can be used for accurately localizing the multichannel SAR mobile object positions.
Description
technical field [0001] The invention belongs to the technical field of radar, relates to a method for precise positioning of a moving target under a multi-channel SAR system, and can be used as a basis for further target tracking and parameter estimation. Background technique [0002] In the context of modern high-tech and complex warfare, timely and effective acquisition of information on the battlefield is very important. As an important microwave remote sensing imaging radar, synthetic aperture radar (SAR) has the unique characteristics of all-day, all-weather and functional diversification. It has been widely used in many fields, especially it can realize the detection and positioning of ground moving targets while imaging. The multi-channel SAR moving target detection system does not need the estimation process of the clutter covariance matrix in the space-time two-dimensional algorithm, and has a small amount of calculation, which is convenient for real-time data proce...
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IPC IPC(8): G01S13/90G01S13/06
Inventor 陈士超邢孟道保铮张双喜
Owner XIDIAN UNIV