Device and method for accurately calibrating point object detectivity of laser radar
A technology of laser radar and target detection, which is applied in the direction of measuring devices, electromagnetic wave reradiation, radio wave measurement systems, etc., can solve the problems of the influence of the beam quality distribution on the detection ability, the inability to accurately quantitatively calibrate, etc., and achieve stable test results and test accuracy high effect
Inactive Publication Date: 2013-11-06
XIAN UNIV OF TECH
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Problems solved by technology
[0003] The object of the present invention is to provide a precise calibration device and method for laser radar to point target detection capability, to solve the problem that its detection capability (maximum detection range) is affected by the beam quality distribution when the detection target of laser radar is much smaller than the cross-sectional area of the laser beam. Problems that have serious impact and cannot be accurately quantitatively calibrated
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[0024] The invention provides an accurate calibration device for laser radar's ability to detect point targets, which is composed of an indoor laser far-field distribution test device and a laser radar detection sensitivity test device;
[0025] Such as figure 1 As shown, the indoor laser far-field distribution testing device includes a first laser radar emission system 1-9, a first beam splitter 1-1, a long focal length parabolic reflector 1-3 and a computer processing system 1-8; the first beam splitter 1 -1 and the computer processing system 1-8 are sequentially provided with a first photoelectric converter 1-6 and a first time delay device 1-7, the first photoelectric converter 1-6, the first time delay device 1-7 and The computer processing system 1-8 is sequentially connected by wires; a first neutral density filter 1-2 is arranged between the first beam splitter 1-1 and the long focal length parabolic reflector 1-3; the computer processing system 1-8 also A beam qualit...
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The invention provides a device for accurately calibrating the point object detectivity of a laser radar. The device consists of an indoor laser far-field distribution measurement device and a laser radar detection sensitivity measurement device; a method for calibrating the point object detectivity comprises the steps that: the indoor laser far-field distribution measurement device is firstly utilized for obtaining the beam quality distribution K of the laser which is sent by the laser radar, then the laser beam which is sent by the laser radar and an analog return signal are modulated to be parallel, and the energy value P of the analog return signal which enters a laser radar receiving system is measured; and the attenuation multiple of an absorption-type attenuation piece is increased until the detected signal which is output by the laser radar receiving system reaches a critical value, a minimum detectable power Prmin is obtained, and finally, the detectivity of the laser radar for small objects is acquired. The device and the method have the beneficial effects that: the beam quality distribution and the laser radar detectivity are combined, so the detectivity of the laser radar can be accurately acquired when the object is positioned at different positions of a laser cross section.
Description
technical field [0001] The invention belongs to the technical field of laser active detection, and in particular relates to a precise calibration device and method for a laser radar to detect a point target. Background technique [0002] The detection capability of lidar is the main technical index of system design, and the detection capability is determined by the comprehensive performance (detection sensitivity) of the entire system, the transmission medium conditions and the characteristics of the measured target. The detection distance of spaceborne or airborne instruments is usually very long, the detection capability cannot be directly measured or the test cost is high, and it needs to be evaluated by indirect measurement and analysis and calculation methods on the ground. According to the difference of the detection target relative to the cross-sectional area of the beam, the detection target can usually be divided into surface target and point target. For the same...
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IPC IPC(8): G01S17/06G01S7/497
Inventor 狄慧鸽黄庚华华灯鑫
Owner XIAN UNIV OF TECH