High-precision optical communication ranging and positioning method and system suitable for underwater

By using high-precision optical communication technology and single beacon positioning method underwater, the problem of insufficient accuracy and anti-interference in traditional underwater ranging positioning technology is solved, and high-precision and low-energy consumption underwater positioning and data transmission are achieved.

CN119644343APending Publication Date: 2025-03-18CHINA NAT OFFSHORE OIL CORP +1
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Patent Information

Application Number
CN202411600442.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-11-11
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

Traditional underwater ranging positioning technology has problems such as insufficient accuracy, weak longitudinal resolution, weak interference resistance and large time cumulative errors, which are difficult to meet the needs of underwater high-precision and high-safety operations.

Method used

High-precision optical communication ranging and positioning method is adopted to send and receive laser signals through lasers, and data transmission and signal demodulation are used to use quadrature amplitude modulation and coherent demodulation technology to calculate relative distance and position coordinates, and information is synchronized through the acoustic communication protocol.

Benefits of technology

It realizes high-precision positioning and data transmission in underwater environments, enhances the anti-interference and reliability of the system, and is suitable for complex and changeable underwater environments.

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Abstract

The invention relates to the technical field of ranging and positioning, in particular to a high-precision optical communication ranging and positioning method and system suitable for underwater. The method comprises the following steps: S1, generating and sending a laser signal through a laser; s2, encoding data to be transmitted and modulating the data to a laser signal through a quadrature amplitude modulation scheme for data transmission; s3, emitting the modulated laser signal, aligning the modulated laser signal with a target, and receiving an optical signal returned from target equipment; s4, demodulating the received laser signal based on a coherent demodulation method, and recovering information loaded by the laser signal; and S5, after receiving the demodulated signal, calculating the relative distance by using the distance measurement frame information contained in the signal through a distance measurement positioning unit. According to the invention, the laser communication technology is applied to underwater, and the flight time distance measurement positioning technology is combined, so that the advantages of high precision, high anti-interference performance and low energy consumption are satisfied under the condition of low power consumption.
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