Underwater time calibration and synchronization system and method based on inductive coupling communication

Abstract

The invention discloses an underwater time calibration and synchronization system and method based on inductive coupling communication. The system comprises a plastic-coated steel cable and an underwater instrument with an inductive coupling function, the underwater instrument is coupled on the plastic-coated steel cable, a floating ball group is arranged on the plastic-coated steel cable, the bottom end of the plastic-coated steel cable is connected with a gravity anchor through an acoustic release transponder, and the underwater instrument comprises a host with time signal transmitting and receiving functions and a plurality of slaves without a time signal transmitting function but with a time signal receiving function. The host in the system transmits time calibration signals to the slaves in an inductive mode once at regular intervals, and the slaves correct internal high-precision low-temperature-drift clocks (such as atomic clock systems) after receiving the signals to ensure punctuality precision inside slave systems. An instrument with an inductive coupling communication system does not need cable communication, so that the system is flexible in laying position, low in costand small in offshore operation risk.

Description

technical field [0001] The invention relates to an underwater time calibration and synchronization system and method for marine instruments, in particular to an underwater time calibration and synchronization system and method based on inductive coupling communication. Background technique [0002] When marine instruments conduct long-term fixed-point observations underwater, they cannot directly calibrate their internal system time through GPS or NTP (Network Time Protocol), and long-term deployment underwater will cause large time errors. This has caused a huge technical bottleneck for underwater observation or acoustic detection that needs to use high-precision time parameters. For example, traditional acoustic instruments (such as hydrophones) mainly synchronize the time of multiple underwater instruments through underwater cables, but the cost of using underwater cables is extremely high, and the instruments are fixed on the underwater cables by vulcanization. Cannot b...

AI Technical Summary

Problems solved by technology

[0002] When marine instruments conduct long-term fixed-point observation underwater, they cannot directly calibrate their internal system time through GPS or NTP (Network Time Protocol), and long-term deployment underwater will cause large time errors

This creates a huge technical bottleneck for underwater observation or acoustic detection that requires high-precision time parameters

For example, traditional acoustic instruments (such as hydrophones) mainly synchronize the time of multiple underwater instruments through underwater cables, but the cost of using underwater cables is extremely high, and the instruments are fixed on the underwater cables by vulcanization. cannot be adjusted

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