Radar ranging method and laser radar

Abstract

The invention relates to a radar signal light intensity distribution technology, in particular to a radar ranging method. A laser radar provided by the invention adopts signal light with different divergence angles, the first measurement distance uses the signal light with the first divergence angle, the second measurement distance uses the signal light with the second divergence angle, and the third measurement distance uses the signal light with the third divergence angle. Conversion of signal light of different divergence angles is achieved through switching of different light sources or processing of the same light source signal light through using an optical element. Because the larger the signal light detection distance is, the larger the divergence angle is, and the greater the required signal light energy is, the signal light with the smaller divergence angle is selected to detect the long distance, and the detection distance can be effectively increased under the condition that the existing signal light energy is not changed; or under the condition that the required detection distance is not changed, the signal light energy and the whole machine power consumption are effectively reduced, the operability is strong, and the applicability is strong.

Description

technical field [0001] The present application relates to a radar technology, in particular to a radar ranging method. Background technique [0002] At present, the known area array radar or depth camera mainly includes a signal light source, a beam shaping system, an optical receiving system, and a detector. The principle is that the signal light source emits signal light, which is processed by the beam shaping system and irradiates the target object. The light reflected by the target object is received by the optical receiving system, and then processed by the detector to obtain the result. Such as figure 1 In the laser radar ranging method shown, the signal light 1 emitted by the signal light source is a scattered light spot, covering a large field of view, and the light intensity distribution is generally a flat-top light intensity distribution (that is, on the light spot formed after beam shaping , the light intensity is roughly the same) or batwing light intensity di...

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Problems solved by technology

[0003] The embodiment of the present application is to propose a radar ranging method to solve the problem of low light utilization in the prior art. To achieve this purpose, the embodiment of the present application adopts the following technical solutions

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