Chirped modulation mechanism-based laser radar

A chirp modulation and lidar technology, applied in the field of laser measurement, can solve the problem of low measurement accuracy, achieve strong multi-target recognition ability and ingenious structure design.

Inactive Publication Date: 2014-02-19
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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)

Method used

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  • Chirped modulation mechanism-based laser radar
  • Chirped modulation mechanism-based laser radar
  • Chirped modulation mechanism-based laser radar

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Experimental program
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Effect test

Embodiment 1

[0043] Embodiment 1 A laser radar based on a chirp modulation mechanism, which includes a chirp modulator 1, an amplifier A2, an adder 3, a laser 4, a telescope A5, a laser driver 6, a telescope B7, a detector 8, an amplifier B9, a module Digital converter A / D10, computer 11, display 12 and ATP high-speed two-dimensional tracking turntable 13;

[0044] Wherein, the chirp modulator 1, the analog-to-digital converter A / D10 and the ATP high-speed two-dimensional tracking turntable 13 are respectively connected to the computer 11; the chirp modulator 1 is connected to the amplifier A2; the adder 3 is connected to the amplifier A2, the laser driver 6 and The laser 4 is connected; the laser 4 is connected with the telescope A5; the telescope B7, the detector 8, the amplifier B9 and the analog-to-digital converter A / D10 are connected in sequence; the computer 11 is connected with the display 12;

[0045] Chirp modulator 1, amplifier A2, adder 3, laser 4, telescope A5, laser driver 6,...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S17/36G01S17/58
Inventor 蔡红星高明希杨进华谭勇宁成达杨家伟石晶金琨郭沫然
Owner CHANGCHUN UNIV OF SCI & TECH
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