High precision speed-measuring distance-measuring radar system and method

A laser radar, high-precision technology, applied in the direction of radio wave measurement systems, measuring devices, instruments, etc., can solve the problems of inability to obtain speed information, discontinuous distance, and inability to obtain high-resolution distance information, etc., to achieve light weight, electro-optic High efficiency and low power consumption
CN101236253BActive Publication Date: 2010-07-07HANGZHOU ZHONGKE TIANWEI TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HANGZHOU ZHONGKE TIANWEI TECH
Publication Date
2010-07-07

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Abstract

The invention relates to a high precision speed and distance measuring laser radar system and a speed and distance measuring method. The basic principle of the invention is as follows: linear chirp modulation and pseudo-random code modulation of lasers are performed; most lasers after modulation are taken as outgoing lasers and transmitted by a telescope; a small part of the lasers is taken as local oscillator beams and used for coherent detection; laser echo signals are divided into two parts; distance information is obtained after related operation of one part of the laser echo signals and original pseudo-random codes; the frequency difference of the local oscillator beams and echo signal beams is obtained after coherent detection of the other part of the laser echo signals and the local oscillator beams and pulse compression, and simultaneously comprises the distance information and Doppler shift; the Doppler shift is obtained through mathematical manipulation, thereby speed information is obtained. The high precision speed and distance measuring laser radar system and a speed and distance measuring method of the invention is characterized in that the speed information and the distance information of a target can be obtained with high precision.
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Description

technical field

[0001] The patent of the present invention relates to laser radar, especially a high-precision speed measuring and ranging laser radar system and a speed measuring and ranging method. It is a system that jointly utilizes pseudo-random code modulation technology, photon counting technology, coherent detection technology and pulse compression technology , the speed and distance information of the target can be obtained with high precision. Background technique

[0002] When the aircraft lands, it needs to know its speed and position information accurately. This is critical to a safe landing. This is especially the case for landing surfaces with significant discontinuities, such as the Moon. The commonly used method is to measure the distance and then differentiate the distance to obtain the speed, because the discontinuity of the distance cannot obtain the correct speed information. However, the method of cutting the echo signal into multiple small time peri...

Claims

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