Laser radar ranging system

Abstract

The invention relates to a laser radar ranging system. The system comprises a variable gain amplifier, a converter and a controller, the variable gain amplifier is connected with the converter, and the converter is connected with the controller; wherein the controller is used for determining the distance measurement distance between the target object and the optical receiver according to an outputsignal of the converter, and adjusting the gain of the variable gain amplifier according to the distance measurement distance. The controller adjusts the variable gain amplifier to reduce the gain ina short distance and adjusts the variable gain amplifier to increase the gain in a long distance, so that the amplitude of an optical signal detected by the laser radar in long-distance detection isenhanced, the dynamic range of a detection signal of the laser radar is improved, and the distance measurement performance and the distance measurement capability are further improved.

Description

technical field

[0001] The invention relates to the field of laser radar, in particular to a laser radar ranging system. Background technique

[0002] Lidar is a radar system that emits laser beams to detect characteristic quantities such as the position and speed of targets. Lidar uses laser as the signal source, and the laser emits pulsed laser to target objects such as trees, roads, bridges and buildings on the ground. The pulsed laser hits the target object, causing scattering, and a part of the light wave will be emitted to the receiver of the laser radar. On the basis of the signal reflected by the target object, the relevant information of the target object can be obtained, such as the target distance, azimuth, height, speed and the shape of the object and other parameters.

[0003] At present, the use of lidar for ranging is mainly by measuring the flight time of the laser between the target object and the lidar, and according to the flight time and the speed of lig...

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