Speed measurement and range finding system and method based on laser heterodyne detection

Abstract

In order to solve a problem that a traditional speed measurement and range finding system is poor in resisting influence, the invention provides a speed measurement and range finding system and method based on laser heterodyne detection. The speed measurement and range finding system comprises a laser, an optical path emission assembly, an optical reception assembly, a processor, a beam splitter, a beam combiner and a focal plane array detector; the input terminal of the beam splitter is connected to the output terminal of the laser; in two paths of optical signals which are split by the beam splitter, one path of optical signals is sent to an optical path emission assembly and is projected to a target object to be measured, and the other path of optical signals is sent into the beam combiner; the optical path reception assembly receives echo signals and converges the echo signals on an input terminal of the beam combiner after filtering; the beam combiner is used for performing coherent mixing on one path of optical signals which is split by the beam splitter and the echo signals to obtain a difference frequency signal; the focal plane array detector performs sampling, processing and analog to digital conversion on the difference frequency signal and then transmits the difference frequency signal to a processor; and the processor obtains speed and distance information of the target object to be measured.

Description

technical field [0001] The invention belongs to the technical field of laser detection, and in particular relates to a speed measurement and distance measurement system and a speed measurement and distance measurement method based on laser heterodyne detection. Background technique [0002] Speed ​​measurement and ranging coherent lidar is one of the comprehensive applications of lidar technology, coherent detection technology, and signal processing technology. It is widely used in many fields such as aerospace, target monitoring, and wind field measurement. It has broad applications in military and civilian fields. prospect. However, when laser radar is used to measure the speed and distance of moving objects, especially moving vehicles, because there are many vehicles on the road, if laser signals are emitted at the same time or time-sharing to detect the distance and speed of the target, there will be a strong gap between the vehicles. Interference, it is easy to cause t...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of poor anti-interference ability of the traditional speed measurement and distance measurement system, the present invention provides a speed measurement and distance measurement system and a speed measurement and distance measurement method based on laser heterodyne detection with good anti-interference ability

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