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Velocity measuring and ranging system and method of measuring and ranging based on laser heterodyne detection

A ranging system and laser heterodyne technology, applied in the field of laser detection, can solve problems such as poor anti-interference ability

Active Publication Date: 2020-08-18
NINGBO ABAX SENSING ELECTRONICS TECH CO LTD
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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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  • Velocity measuring and ranging system and method of measuring and ranging based on laser heterodyne detection
  • Velocity measuring and ranging system and method of measuring and ranging based on laser heterodyne detection
  • Velocity measuring and ranging system and method of measuring and ranging based on laser heterodyne detection

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Embodiment Construction

[0077] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0078] like figure 1 As shown, the speed measuring and ranging system provided by the present invention is mainly composed of a modulator 1, a laser 2, a beam splitter 3, an optical path transmitting component 5, an optical path receiving component 9, a beam combiner 7, a focal plane array detector 8 and a processor 10 compositions.

[0079] The processor 10 sends a square wave signal to the modulator 1, and after the integral conversion of the modulator 1, a triangular wave signal is generated to modulate the light source emitted by the laser 2, and the beam splitter 3 divides the output beam of the laser 2 into two paths: one path is used as The transmitted signal light enters the optical path emitting assembly 5 and is projected onto the target object 11 to be measured through the optical path emitting assembly 5 ; the other path of light enters t...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/50G01S17/48
CPCG01S17/48G01S17/50
Inventor 雷述宇
Owner NINGBO ABAX SENSING ELECTRONICS TECH CO LTD
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