An underwater quantum ranging method based on Xinghai optical quantum link transmission

Abstract

The invention proposes an underwater quantum ranging method based on Xinghai optical quantum link transmission. Firstly, the aiming and tracking technology is used to establish the optical quantum communication link, the laser on the satellite generates the pumping light, and the pumping light is incident on the periodically poled potassium titanyl phosphate crystal, the spontaneous parametric down-conversion occurs, and the signal light with entanglement characteristics is obtained and idle light, send the signal light and idle light to the surface station 1 and the surface station 2 respectively, and use the single photon detectors of the two surface stations to receive photons; secondly, let the surface station 1 sink, and the surface station 2 float on the sea surface, Track the position of the sea surface station 1; then, use the single photon detector on the sea surface station 1 to send photons to the target, and receive them by the single photon detector after being reflected by the target; finally, use the high-speed acquisition circuit to track the single photon of the two sea surface stations. The time pulse sequence output by the photon detector is coincidence counted to obtain the flight time of the signal light, and then calculate the distance between the sea surface station 1 and the target.

Description

technical field [0001] The invention relates to the field of high-precision ranging of underwater targets, in particular to an underwater quantum ranging method based on Xinghai optical quantum link transmission. Background technique [0002] The traditional underwater ranging technology mainly uses laser and ultrasonic to measure the distance of the target. The principle is to transmit the ranging signal to the target and reflect it back to the transmitter to obtain the time difference from the transmitter to the target, and then calculate the available transmitter. distance to the target. Traditional underwater laser ranging technology is easily affected by signal stability and multipath propagation of light, and is not suitable for long-distance measurement. In addition, the underwater ultrasonic ranging is caused by the change of sound velocity caused by the pressure and temperature in the turbulent environment, which causes a large error between the measured distance a...

AI Technical Summary

Problems solved by technology

Traditional underwater laser ranging technology is easily affected by signal stability and multipath propagation of light, and is not suitable for long-distance measurement

In addition, underwater ultrasonic distance measurement has a large error between the measured distance and the actual distance due to the change of sound velocity caused by the pressure and temperature in the turbulent environment.

Traditional underwater ranging technology has problems such as low accuracy and limited measurement range, which restricts the improvement of underwater target detection level

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