Propagation time measurement method for direct signals based on autonomous underwater vehicles

Abstract

The invention provides a propagation time measurement method for direct signals based on autonomous underwater vehicles. The invention comprises the steps of: determining a set of measurement time ofdirect signal propagation point in a known task area with to be measured sound speed; placing a sending underwater autonomous vehicle and a receiving underwater autonomous vehicle at the known task area with to be measured sound speed to measure propagation time of direct sound signals through a single-input-multiple-output double direction interaction communication mode; according to the propagation time of direct sound signals, acquiring a sound speed profile by adopting a sound speed profile inversion algorithm which based on a matched field processing technology; and carrying out measurement and sound speed profile inversion on each latitude and longitude coordinate point to construct a sound speed profile set according to the sound speed profile inversion algorithm which based on thematched field processing technology. The method has the advantages that influence of boundary parameter mismatch is reduced, and an approximate error of representing sound speed distribution of the whole area is avoided.

Description

technical field [0001] The invention belongs to the field of ocean acoustic tomography, in particular to a method for measuring the transit time of a direct signal based on an underwater autonomous vehicle. Background technique [0002] In underwater acoustics, sound source parameters, ocean environment parameters and sound field information received by hydrophones are the three most basic acoustic modules. Theoretically, if any two of the above three parameters are known and combined with the existing underwater acoustic propagation model, another parameter can be obtained. The parameter acquisition process can be divided into forward calculation, positioning calculation and inversion calculation according to different working modes. Solving sound source parameters and inversion of sound velocity profile is to infer marine environmental parameters under the condition of known sound field information and sound source parameters. The inversion of sound velocity profile is a...

AI Technical Summary

Problems solved by technology

Because the traditional sound field data measurement method is not convenient for frequent recovery and deployment of transceiver nodes, the sound velocity profile under a single profile is usually measured to approximately represent the distribution of sound velocity in the entire area, which will cause approximation errors for large-scale target areas and areas where sound velocity changes significantly. Unable to meet the application requirements of obtaining finer-grained sound velocity profile distribution in the target area

Images