Micro-Doppler Information Measurement System for Weak Laser Echo Signals

A technology of Doppler information and laser echo, which is applied in radio wave measurement systems, measurement devices, electromagnetic wave re-radiation, etc., can solve problems such as the inability to extract frequency information of weak signals, and achieve improved detection dimensions, high real-time performance, and The effect of increasing the range of action

Active Publication Date: 2022-08-05
HARBIN INST OF TECH
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Problems solved by technology

[0004] Aiming at the existing problem that the frequency information in the weak signal cannot be extracted, the present invention provides a micro-Doppler information measurement system based on the weak laser echo signal of quantum heterodyne

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  • Micro-Doppler Information Measurement System for Weak Laser Echo Signals
  • Micro-Doppler Information Measurement System for Weak Laser Echo Signals
  • Micro-Doppler Information Measurement System for Weak Laser Echo Signals

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Embodiment Construction

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0024] It should be noted that the embodiments of the present invention and the features of the embodiments may be combined with each other under the condition of no conflict.

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but it is not intended to limit the present invention.

[0026] A micro-Doppler information measurement system for weak laser echo signals...

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Abstract

The micro-Doppler information measurement system for weak laser echo signals solves the problem that the existing frequency information in weak signals cannot be extracted, and belongs to the technical field of laser Doppler speed measurement. The system includes: a quantum heterodyne detection system and a processor; a quantum heterodyne detection system for using the coherence of the local oscillator light and the signal light reflected by the target to compare the difference frequency optical signal frequency of the local oscillator light and the signal light with the frequency of the signal light. The time distribution of photons is coupled to obtain the time distribution of photons and sent to the processor; the processor is used to restore the frequency information of the difference frequency optical signal according to the time distribution of photons, and obtain the Doppler information and micro-Doppler information of the target. . Using the Bayesian estimation-based statistical method of response time distribution to restore the difference frequency information, the amount of data required for statistics is small, and the real-time detection is high, which is suitable for the needs of micro-Doppler detection.

Description

technical field [0001] The invention relates to a high-resolution frequency information acquisition method of a weak echo signal, and belongs to the technical field of laser Doppler velocity measurement. Background technique [0002] Laser velocity measurement is a research hotspot in the field of lidar at present. Lidar that uses the Doppler effect to measure velocity through a heterodyne detection system is relatively mature, and is widely used in the field of spectroscopy, space research, lidar, optical communication systems, optical tomography, etc. [0003] At present, the main research difficulty and focus of the laser speed measurement radar detection system is the detection of weak laser echo signals. The current detection method for weak signals is to use GM-APD to complete the detection, and GM-APD can only respond to the echo signal strength. With or without, the frequency information in the weak signal cannot be extracted. SUMMARY OF THE INVENTION [0004] In...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/58G01S7/48
CPCG01S17/58G01S7/4802
Inventor 张子静赵远关策王志远唐玉珠
Owner HARBIN INST OF TECH
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