A pulse laser ranging echo amplitude automatic adjustment system

Abstract

The invention discloses a system for automatically adjusting the echo amplitude of pulsed laser ranging. By obtaining the peak value of the laser echo signal and setting the excitation power supply of the laser according to the amplitude of the peak value, the laser echo signal gradually increases with the amplitude. Continuously reduce the excitation power supply, so as to avoid the problem that the amplitude of the echo signal is too large after being amplified when the distance between the target and the target is close; at the same time, compared with the closed-loop automatic gain control circuit in the amplification circuit in the prior art, it can The time-delayed response of the automatic gain control loop circuit to the pulse signal control is avoided, the control method is simple, and the realization cost is low.

Description

technical field [0001] The invention belongs to the technical field of laser distance measurement, and in particular relates to an automatic adjustment system for pulse laser distance measurement echo amplitude. Background technique [0002] Since the invention of laser ranging, a large number of companies and research institutes at home and abroad have continuously conducted in-depth research on it, and various types of laser ranging are widely used in military and civilian fields. [0003] In the existing laser ranging products, the distance range measured by the user is uncertain in advance. In order to ensure the longest distance can be measured, the peak value of the laser pulse emitted by the laser in the ranging system generally takes a constant maximum value. Under the same transmission power conditions, the peak power of the reflected echo received by the photodetector is mainly related to the reflection coefficient of the measured object and the distance of the mea...

AI Technical Summary

Problems solved by technology

At the same time, for the measured object with the same reflection coefficient, the laser echo signal power is inversely proportional to the square of the detection distance, so there will be a large gap between the long-distance echo power and the short-distance echo power, which will reduce the measurement accuracy

[0004] In addition, in order to ensure that both long-distance and short-distance echoes are within the processing range of the signal processing system, the post-amplification circuit used in the prior art usually adopts a closed-loop automatic gain control circuit, and the general closed-loop automatic gain control circuit needs to detect The average power of the output signal, therefore, requires a certain response time, and the real-time control of the echo signal cannot be realized. At the same time, when the reflection coefficient of the measured object changes suddenly, or the distance of the measured object changes suddenly, the adjacent amplified There will still be a large difference in the echo signal amplitude

[0005] To sum up, for the fuze laser ranging application, the processing speed of the detection system needs to be fast enough, and the existing technology has the problems of excessive echo signal amplitude, low measurement accuracy, slow processing speed, long response time and high cost.

Images