Undersampling based high-speed movement target micro-doppler parameter estimation method

Abstract

The invention provides an undersampling based high-speed movement target micro-doppler parameter estimation method. The undersampling technology is introduced aiming at radar micro-doppler signals of high-speed movement targets. Radar micro-doppler echo signals are narrow-band signals with large center frequency values and a high sampling frequency is required when a traditional nyquist sampling frequency is used to sample the signals. But according to the undersampling theorem, the signals are sampled with the sampling frequency which is 2 times higher than that of a micro-doppler signal bandwidth and much smaller than the nyquist sampling frequency. According to the undersampling technology, target translational velocity information is saved, the signal sampling data size is greatly reduced, later computing costs and requirements for hardware equipment are lowered, meanwhile target tender moving information is remained, then time frequency distribution processing is performed on the sampling data, and time frequency characteristics of the echo signals can be obtained and tender moving parameter estimation of the targets can be performed.

Description

technical field [0001] The invention belongs to the technical field of radar micro-Doppler signal processing, in particular to a method for estimating micro-Doppler parameters of a high-speed moving target based on undersampling. Background technique [0002] In 1842, the Austrian scientist Christian Johann Doppler (Doppler) first discovered and proposed the Doppler effect, which is a Doppler frequency shift phenomenon caused by the relative motion between the detector and the target , the performance on the spectrum is a constant frequency shift. However, when the target moves radially relative to the detector, it often has its own micro-motion phenomenon. Micro-movements are ubiquitous, such as the heartbeat of living organisms, the vibration of the surface of objects caused by engines, the rotation of propellers on helicopters or the rotation of radar antennas on ships, the various motion states of ballistic missile warheads, mechanical vibrations and the vibration of ve...

AI Technical Summary

Problems solved by technology

When the target has a higher translational velocity, according to the Nyquist sampling theorem, a higher sampling frequency is required, so that a large amount of sampling data will be obtained, which increases the post-calculation cost and improves the requirements for hardware conditions

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