Chirped modulation mechanism-based laser radar

Abstract

The invention provides a chirped modulation mechanism-based laser radar, which comprises a chirped modulator, an amplifier A, an adder, a laser, a telescope A, a laser driver, a telescope B, a detector, an amplifier B, an analogue / digital (A / D) converter, a computer, a display and an array transform processor (ATP) high-speed two-dimensional tracking turntable. A chirped modulation laser signal technology, a high-speed photoelectric detection technology and a high-speed two-dimensional turntable technology are combined, a laser emission source of a chirped modulation mechanism is adopted, a high-speed PIN detector detects an echo signal, and the ATP high-speed two-dimensional tracking turntable determines the distance and speed information of a target in a periodical scanning way to perform detection with distance accuracy capable of reaching millimeter magnitude on the target which is at a distance of thousands of meters. An emitted laser signal has a high time width-bandwidth product and high multi-target identification capability, so that the chirped modulation mechanism-based laser radar is applied to penetrating target detection under the conditions of mist, woods and the like with certain sheltering obstacles, and is used for military affairs, aerospace, marine survey and the like.

Description

technical field [0001] The invention relates to a laser radar based on a chirp modulation mechanism, belonging to the technical field of laser measurement. Background technique [0002] Lidar is an advanced detection method combining laser technology and modern photoelectric detection technology. LiDAR operates in two modes, pulsed or continuous wave. [0003] The pulse laser radar technology uses the characteristic that the propagation speed of the laser is basically constant in the air, and determines the distance between the receiver and the measured target by measuring a round-trip time of the laser pulse. Existing pulsed laser ranging can measure long-distance targets (up to a distance of tens of kilometers), but the measurement accuracy is not high (up to a meter-level accuracy). [Huo Yujing, Yang Chengwei, Chen Qiansong. Progress of pulsed laser ranging source. "Laser and Infrared". 2002, 32(3): 131-134]. [0004] In the high-speed photodetector technology, since t...

AI Technical Summary

Problems solved by technology

Existing pulse laser ranging can measure long-distance targets (up to a distance of tens of kilometers), but the measurement accuracy is not high (up to a meter-level accuracy)

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