Long distance and high accuracy oriented compound laser range finding method and system

Abstract

The invention provides a long distance and high accuracy oriented compound laser range finding method and system. According to the range finding method, the transmitting terminal uses two independent light sources with different wavelengths to generate two channels of range finding signals for performing range finding through a pulse coding method and a phase method respectively. The pulse coding method is a combination of a low order pseudo code signal with an impulse method. The range finding system includes two continuous lasers, an m-sequence signal modulation unit, a phase modulation unit, a pair of optical antennas, two photoelectric detectors, a pulse code processing module, a phase processing module and a range finding result calculation unit. According to the range finding system, two channels of range finding signals can be independently measured, free of interference by a pulse coding method and a phase method respectively; and the range finding results from these two methods are compounded for higher range finding accuracy. Also in the invention, the accuracy advantage of the pseudo-code range finding method is introduced into a conventional impulse method, which increases the measuring accuracy. Compared to the conventional impulse method, the method of the invention can better cope with interference. It takes a shorter pseudo-code acquisition matching time than the pseudo-code range finding method.

Description

technical field [0001] The invention belongs to the technical field of laser ranging, and in particular relates to a long-distance and high-precision composite laser ranging method and system. Background technique [0002] Among many ranging methods, laser ranging is widely respected for its advantages of high precision, good collimation, strong anti-interference, and convenient operation. Traditional laser ranging methods include pulse method, phase method, interferometric method, triangulation method, pseudo-code ranging method, etc. These methods have their own advantages and disadvantages and are suitable for different scenarios. [0003] The current mainstream laser ranging methods include pulse ranging method, phase ranging method and pseudo code ranging method. These three ranging methods are all based on measuring the time difference between the transmitted signal and the echo signal to calculate the distance to be measured. The pulse method is a direct measurement...

AI Technical Summary

Problems solved by technology

[0011] Aiming at the problem that the traditional ranging methods have their own shortcomings when facing long-distance and high-precision applications, the present invention proposes a long-distance and high-precision composite laser ranging method and system, which uses pulse coding and phase compounding The distance measurement scheme realizes high-precision measurement on the basis of satisfying long-distance

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