Micro Doppler feature extraction method based on phase ranging target tracking

Abstract

The invention discloses a micro-Doppler feature extraction method based on phase ranging target tracking, which comprises the following steps of: (1) acquiring broadband radar echoes, and acquiring the accurate position of each scattering point of a target by adopting a phase ranging method; (2) estimating an instantaneous Doppler frequency through time-frequency transformation so as to obtain an instantaneous speed, compensating a target translation speed, extracting a micro-motion Doppler frequency shift component, and calculating a micro-motion speed; (3) introducing the micro-motion speed extracted in the step (2) into a target tracking process, constructing pseudo measurement, and performing sequential filtering to further accurately obtain a micro-motion track; and (4) obtaining a target micro-motion track, and updating micro-motion parameter estimation. According to the invention, the sequential filtering algorithm is introduced into the micro Doppler feature extraction process, the Doppler measurement information is fully utilized to improve the tracking precision of the target, and meanwhile, a high-quality micro-motion curve is obtained, so that more accurate micro-motion parameter estimation is obtained.

Description

technical field [0001] The invention relates to the technical field of radar signal processing, in particular to a micro-Doppler feature extraction method based on phase ranging target tracking. Background technique [0002] The radar emits electromagnetic signals to the moving target, and the target has radial motion relative to the radar, and the radar echo will produce a frequency shift for a long time; in addition to the movement of the main body, if the target or any structural part of the target has slight vibrations, vibrations or rotations in the direction of the radar line of sight This micro-motion will cause additional frequency modulation on the echo signal and produce side frequency around the Doppler shift frequency generated by the subject’s movement. V.C.Chen defines this additional Doppler modulation as micro Doppler effect. [0003] There have been a lot of research results on the extraction of micro-Doppler features in recent years. However, the existing ...

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Problems solved by technology

[0003] There have been a lot of research results on the extraction of micro-Doppler features in recent years. However, the existing micro-Doppler feature extraction methods only analyze micro-motion features in the frequency domain, and extract micro-Doppler features based on time-frequency images. curve, ignoring the time-domain characteristics of the target fretting

However, since the micro-motion of the target is weaker than the translational motion of the target body, it is difficult to accurately estimate the micro-motion amplitude in the time domain, so it has become a difficult point in the research.

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