AM wave phase-locked laser ranging method and device

Abstract

The amplitude modulation wave phase-locked laser ranging method and device belong to the laser ranging technology; the present invention uses an amplitude modulated light wave phase-locked amplifier at the target end of the active phase ranging device; the measuring end of the ranging system sends a beam of light intensity through Sinusoidally modulated beam, the target end of the ranging system performs phase-locked amplification on the received amplitude modulated optical signal from the measurement end, generates a laser signal with the same modulation frequency as the laser signal from the measurement end and has a constant difference, and sends it back to the measurement end. The measurement terminal realizes the distance measurement by detecting the phase difference between the sending and receiving signals and combining the constant phase difference; it has the characteristics of high ranging accuracy.

Description

technical field [0001] The invention belongs to laser ranging technology, in particular to an amplitude modulation wave phase-locked laser ranging method and device. Background technique [0002] At present, phase laser ranging technology is widely used in long-distance high-precision measurement. The commonly used phase-based laser ranging methods are divided into target-side reflective and target-side active cooperative methods. The main disadvantage of the reflective ranging method is that the attenuation form of the return light signal intensity is the fourth power attenuation function of the measured distance. With the increase of the measured distance, the return light signal attenuates rapidly, resulting in a decrease in the signal-to-noise ratio. It limits the improvement of measuring range. In order to solve the above defects, the active cooperative phase laser ranging method and device (patent number: ZL200810137082) invented by Tan Jiubin and Liu Siyuan of Harbi...

AI Technical Summary

Problems solved by technology

The main disadvantage of the reflective ranging method is that the attenuation form of the return light signal intensity is the fourth power attenuation function of the measured distance. With the increase of the measured distance, the return light signal attenuates rapidly, resulting in a decrease in the signal-to-noise ratio. Limits the range improvement

In order to solve the above defects, the active cooperative phase laser ranging method and device (patent number: ZL200810137082) invented by Tan Jiubin and Liu Siyuan of Harbin Institute of Technology added a laser at the target end to amplify the intensity of the optical signal, thus greatly The ranging distance is increased, but its main disadvantage is that the target end will introduce a phase difference during the process from receiving the optical signal to emitting the optical signal, and the phase difference will change in real time under the influence of the external environment, so that the ranging result is inaccurate

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