Laser radar system for tracking and identifying low, small and slow object based on laser micro-Doppler effect

Abstract

The invention provides a laser radar system for tracking and identifying a low, small and slow object based on the laser micro-Doppler effect, belongs to the field of laser radar detection, and aims at solving the problem that a present micro-Doppler microwave radar is interfered by ground clutters seriously. A laser source module outputs relatively strong signal light and relatively weak local oscillation light, a frequency shift modulation module carries out frequency shift on the signal light, and the signal light after frequency shift is input to a heterodyne detection module; the heterodyne detection module uses the signal light after frequency shift to scan a target area and obtains a target echo; beam combination is carried out on the target echo and the local oscillation light, the light after beam combination is detected, an intermediate-frequency signal is collected and processed, signal spectral distribution including target motion and micro-motion information is obtained, whether an object is the low, small and slow object is determined, and if YES, the speed and distance of the object are obtained; and the object is tracked according to the obtained speed and distance of the object.

Description

technical field [0001] The invention relates to a laser radar system, in particular to a laser radar system for tracking and identifying low, small and slow targets based on the laser micro-Doppler effect, and belongs to the field of laser radar detection. Background technique [0002] In recent years, with the development of technology, more and more small and slow targets represented by unmanned aerial vehicles have been put into military and civilian applications, and tracking and identification of such targets has also become the current national defense security and information security issues. problems in the field that need to be solved urgently. Combining micro-Doppler to identify targets is a commonly used method in the field of microwave radar, which can effectively distinguish man-made targets from natural targets. [0003] However, in the process of detecting small and slow targets, this method will be interfered by ground waves from ground buildings and other o...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing micro-Doppler microwave radar is severely interfered by ground clutter and cannot effectively detect and identify low-altitude low-flying low-flying targets, the present invention provides a laser micro-Doppler effect-based tracking and identification LiDAR system for small and slow targets

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