An Adaptive Optical Aperture Control Method for Effective GM-APD Lidar Target Detection

Abstract

The invention discloses an adaptive optical aperture control method for effectively detecting a Gm‑APD laser radar target, belonging to the field of radar detection. The dichotomy method is used to roughly adjust the effective receiving caliber to realize the judgment of the presence or absence of the target; the maximum target trigger probability is obtained based on the Poisson trigger probability model, and the receiving caliber of the lidar system corresponding to the maximum trigger probability of the target is the optimal receiving caliber; The relationship function between the aperture diaphragm and the effective receiving aperture in the actual receiving system, the relationship function between the number of steps of the diaphragm motor and the radius of the aperture diaphragm, realizes the calculation of the optimal aperture diaphragm radius and the number of motor steps, and the host computer controls the motor step The number of times realizes the adaptive adjustment of the optimal receiving aperture, without human participation, and can realize the maximum detection probability of the target under the background condition of high noise in the daytime.

Description

technical field [0001] The invention belongs to the field of radar detection, in particular to an adaptive optical aperture control method for effectively detecting a Gm-APD laser radar target. Background technique [0002] The laser active detection technology based on Gm-APD has been developed for more than 20 years, and the theoretical research and engineering application are becoming more and more mature. Since Gm-APD has the single-photon level detection capability, the detection probability of Gm-APD is not only related to the signal-to-noise signal of the echo It is also related to the absolute strength of the signal (or noise), so daytime detection is greatly limited. In order to achieve efficient target detection as much as possible under daytime conditions, researchers proposed to improve the probability of echo triggering by changing the receiving aperture of the receiving system. For traditional linear detection systems, the larger the aperture, the better the d...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to realize an adaptive optical aperture control method for the effective detection of a Gm-APD laser radar target, which can solve the problem of manual adjustment and human eye observation of the existing optical aperture, and can optimize the probability of echo detection as Purpose To adjust the adaptive receiving aperture to realize the effective detection of the target in the daytime

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