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

A technology of Doppler effect and laser radar, applied in the field of laser radar system, can solve the problems of inability to detect and identify low and slow flying targets, ground clutter interference, etc., and achieve filtering of surface clutter interference, large dynamic range and stability sex high effect

Inactive Publication Date: 2017-08-15
HARBIN INST OF TECH
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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 l...

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

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Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0025] It should be noted that, in the case of no conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0027] The laser radar system for tracking and identifying low, small and slow targets based on the laser micro-...

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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...

Claims

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Application Information

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IPC IPC(8): G01S17/08G01S17/58
CPCG01S17/08G01S17/58
Inventor 张勇杨成华赵远徐璐刘越豪沈志强宁敏
Owner HARBIN INST OF TECH
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