High-angular-resolution laser radar and detection method thereof

Abstract

According to a high-angular-resolution laser radar and a detection method thereof, the problem that in the prior art, the radar measurement angular resolution is limited is solved, the emission frequency of a light source can be greatly increased, and the distribution density of point clouds is remarkably improved during detection, so the high angular resolution is achieved. The laser radar comprises a main control and data resolving system, and a zoom laser emission system, a laser scanning system and a laser receiving system are respectively connected with the main control and data resolvingsystem; the zoom laser emission system comprises a high-repetition-frequency high-power optical fiber laser, an optical fiber splitter, an optical fiber delayer, an optical fiber beam combiner and anoptical fiber collimator which are arranged in sequence; and the laser receiving system comprises a laser receiving optical system and a photoelectric detector. The laser scanning system is a two-dimensional MEMS micro scanning mirror and adopts a non-resonant scanning mode.

Description

Technical field: [0001] The invention belongs to the technical field of laser detection, and relates to a laser radar with high angular resolution and a detection method. Background technique: [0002] Lidar is a radar system that emits laser beams to detect characteristic quantities such as the position and speed of targets, and is composed of laser transmitters, optical receivers, and information processing systems. Its working principle is to emit a laser beam to the target, and then compare the received signal reflected from the target with the transmitted signal, and after proper processing, the relevant information of the target can be obtained, such as target distance, azimuth, height, speed, parameters such as pose and shape. [0003] When the laser radar is used for long-distance detection, the laser spot will become larger as the distance becomes longer. When the detected object is smaller than the spot size, the position of the object will be deviated. This is be...

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Problems solved by technology

[0003] When the laser radar is used for long-distance detection, the laser spot will become larger as the distance becomes longer. When the detected object is smaller than the spot size, the position of the object will be deviated. This is because when the radar is calibrated to detect the target position , is determined by the laser emission direction and the echo time, so the small target appears at any position in the spot, and the azimuth obtained is the same, which brings measurement error, and the error increases with the distance to increase

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