Laser imaging radar device and distance measurement method thereof

Abstract

The invention provides a laser imaging radar device and a distance measurement method thereof. The laser imaging radar device and the distance measurement method thereof aims at the problem that an existing distance range gate laser imaging radar is low in distance resolution. The laser imaging radar device comprises a laser device, a laser modulation unit, an optical antenna unit, a detecting unit, a data processing unit and an image processing unit, wherein the detecting unit is composed of a counter, a gate controller and an array detector, and the data processing unit is composed of an accumulator and a correlator. According to the distance measurement method, an information loading process is carried out on laser signals with constant amplitude by using a phase code pulse amplitude modulation mode. The laser imaging radar device and the distance measurement method thereof have the advantages that the equipment and the method combine the advantages of long detecting distances of the distance ranging gate layer imaging radar and the advantage of high distance measurement resolution of the pulse phase coding mode, and meanwhile the detect of low distance measurement resolution of the distance ranging gate layer imaging radar and the detect of low imaging speed of the pulse phase coding mode are avoided.

Description

technical field [0001] The invention relates to the field of laser radar, in particular to a laser imaging radar device and a distance measuring method thereof. This method can break through the limitation of the detector sampling time on the range resolution of the radar system. Background technique [0002] The range-gated laser imaging radar adopts the laser active lighting method, and uses the range gating technology to detect whether there is a laser echo signal within a specific delay period after the signal is emitted, and judge whether the target exists within the corresponding distance period of the delay period. target, and obtain the echo signals of targets at different distances in sequence according to the delay time, so as to obtain the 3D imaging information of the target. The range resolution of range-gated lidar imaging depends first on the range-gate interval, and secondly on the influence of range gate and laser pulse signal fluctuations. Narrow pulse wid...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem of low range resolution of existing range-gated laser imaging radars, the present invention provides a laser imaging radar device and a method for measuring distances of an optical imaging radar device, using reverse m-sequence phase-encoded range gating way to achieve super-resolution imaging of the target

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