Method suitable for micro-Doppler analysis of space target in short-time observation

Abstract

A method suitable for a micro-Doppler analysis of a space target in short-time observation includes the steps of: (1) using a forward and backward TVAR model to represent radar echoes of the space target in short-time observation, thereby obtaining a forward and backward TVAR model of the space target in short-time observation; directing at the space target in short-time observation, introducing sparsity in a solving method of a forward and backward TVAR model based on least squares, and building a sparse forward and backward TVAR model; (3) using a minimum description length criterion to determine the order of the sparse forward and backward TVAR model and the dimension of a primary function; (4) when the order of the sparse forward and backward TVAR model is p0 and the dimension of the primary function is q0, obtaining estimations [alpha]0<^> and [alpha]0<*><^> of time-unvarying coefficient vectors of the sparse forward and backward TVAR model; and (5) calculating an instantaneous signal power spectrum of the space target in short-time observation according to the estimation [alpha]0<^> of the time-unvarying coefficient vector of the sparse forward and backward TVAR model, thereby realizing the micro-Doppler analysis of the space target in short-time observation.

Description

technical field [0001] The invention belongs to the technical field of radar target identification, and relates to a micro-Doppler analysis method suitable for short-term observed space targets, which can be used for micro-Doppler analysis of short-term observed space targets. Background technique [0002] Micro-motion features are generally considered to be able to uniquely characterize the motion characteristics of targets, and have the ability to provide reliable information for the identification and classification of radar targets. In the micro-motion sensing application of space targets, the time-frequency analysis method is widely used to perform micro-Doppler analysis on the target to obtain its micro-motion characteristics; among them, the linear time-frequency analysis method, such as the short-time Fourier method, is a traditional Fourier method. In the extension of the method, the signal in the time window is regarded as a stationary signal, and the change law of...

AI Technical Summary

Problems solved by technology

Therefore, in such cases, it is more difficult to accurately analyze the micro-Doppler of space targets using the forward-backward TVAR model method based on least squares

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