Succeeding light path chopper disk output frequency self-adaptive control method and system for laser radar

Abstract

The invention discloses a succeeding light path chopper disk output frequency self-adaptive control method and system for laser radar. Output control of a control voltage value is performed with a self-adaptive fuzzy PID control algorithm, the time-delay character of a succeeding light path chopper disk is effectively reduced, rapidity in dynamic adjustment and stability in steady-state adjustmentare realized, besides, the rotating speed of a driving motor is controlled through second-layer closed-loop control, the instability of the rotating speed of the driving motor under the first-layer closed-loop control is compensated, larger shaking of succeeding light path chopper disk output frequency due to multiple environment factors and control voltage shaking is further overcome, and the stability of the initial height of a return signal of the laser radar is guaranteed; moreover, the rotating speed frequency of the succeeding light path chopper disk is output directly, accurately and rapidly by a frequency output unit and is more accurate and reliable than a rotating speed voltage signal output by a Hall sensor in the driving motor.

Description

technical field [0001] The present invention relates to the technical field of laser radar, and more specifically, relates to a method and system for adaptively controlling the output frequency of a laser radar subsequent optical path chopper. Background technique [0002] In recent decades, lidar has been used more and more widely to detect atmospheric parameters and atmospheric composition. In order to obtain very weak echo signals in the far field, in laser atmospheric detection, the method of increasing the laser emission power and increasing the area of ​​the receiving telescope is usually adopted. The problem that these two methods bring to lidar is that the near-field echo signal is very strong, and the dynamic range of lidar system detection is not enough, making it difficult to detect. At present, the electronic gating signal of the photomultiplier tube is widely used in the laser radar system to suppress the near-field strong echo signal. The photocathode of the ...

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Problems solved by technology

[0003] In the process of using the laser radar multi-channel receiving optical path high-speed chopper device in the self-developed ozone laser radar system, we found that the output frequency of the chopper disc has a large jitter due to various environmental factors and motor control voltage jitter for a long time , the control accuracy of ordinary PID (proportional-integral-derivative) controller is relatively high, but the accuracy is not high enough for various dynamic and steady-state operating conditions

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