Airborne array three-dimensional coherent scanning laser radar

A technology for scanning lasers and arrays, applied in instruments, measuring devices, and re-radiation, etc., it can solve the problems of difficult to receive echo signals, increase scanning speed, and long detection distance, so as to increase the density of point clouds and improve the imaging amplitude. Wide and improve the effect of working distance

Active Publication Date: 2020-05-22
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Problems solved by technology

In the application of airborne scanning, the above-mentioned prior technologies mainly have the disadvantages of small scanning angle, narrow imaging field of view, low repetition frequency, and sparse point cloud density. The main reason is that the airborne detection distance is long, and there is a gap between the scanning speed and the detection field of view. Contradictory, that is, it is difficult for the optical scanner to scan quickly to receive the echo signal, and it is useless to simply increase the repetition frequency and increase the scanning speed

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[0021] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but the protection scope of the present invention should not be limited thereby.

[0022] figure 1 It is a structural schematic diagram of an airborne array three-dimensional coherent scanning laser radar device of the present invention. As can be seen from the figure, the airborne array three-dimensional coherent scanning laser radar of the present invention includes a frequency-modulated laser 1, a first beam splitter 2, an array transceiver telescope 3, an optical Scanner 4, delayer 5, second beam splitter 6, multi-channel optical bridge 7, array detector 8 and signal acquisition and processor 9, the positional relationship of the above components is as follows:

[0023] The beam output by the frequency-modulated laser 1 is divided into N signal beams and a local oscillator beam through the first beam splitter 2:

[0024] The N-way signal beams are tr...

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Abstract

The invention relates to an array three-dimensional coherent scanning laser radar device, which comprises a frequency modulation laser, a first beam splitter, an array transceiving telescope, an optical scanner, a delayer, a second beam splitter, a multi-channel optical bridge, an array detector and a signal acquisition and processor. Through one-dimensional array light beam emission and corresponding array coherent reception, detection target point position data can be effectively improved, an imaging view field is broadened, meanwhile, the scanning speed requirement is lowered, and the system has the advantages of simple structure, easy integration and miniaturization, and is particularly suitable for airborne three-dimensional coherent scanning laser radar information detection.

Description

technical field [0001] The invention relates to a laser radar, in particular to an airborne array three-dimensional coherent scanning laser radar. Background technique [0002] LiDAR has very obvious technical advantages in target recognition, classification and precise targeting. At present, a large number of laser radars with different technical systems have been developed and developed. It can be mainly divided into incoherent light direct detection method and coherent light heterodyne detection method. The most typical incoherent 3D lidar has been widely used in fields such as drones and autonomous driving. They use intensity detection, which has the advantages of simple principle, simple technical route, and high technical maturity, but there are still problems such as serious interference, short detection distance, and low sensitivity. The coherent heterodyne detection method uses the local oscillator laser and the echo signal laser to perform heterodyne technology ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/89G01S7/481G01S7/48
CPCG01S17/89G01S7/4817G01S7/48Y02A90/10
Inventor 卢智勇孙建锋周煜王利娟许倩
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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