Method and system for tracking and positioning underwater target

Abstract

The invention relates to an underwater target tracking and positioning method, which comprises the following steps that: a central processing unit transmits a starting instruction and required positioning data rate information to a blue and green laser transmitting and receiving integral rotatable device, scans an underwater responder, and transmits a laser signal containing the data rate information to the underwater responder; the underwater responder reflects the laser signal according to the prior path, and a transducer is opened; after the reflected laser signal is received, the transducer transmits a synchronous timing signal to the central processing unit, and the central processing unit begins timing; the underwater responder transmits a periodical frequency hopping pulse signal of corresponding data rate to a hydrophorce according to the data rate information; the hydrophorce transmits a direct signal to the central processing unit; and the central processing unit calculates distance information, corrects the coordinate and calculates the coordinate of the underwater responder. The invention also relates to an underwater target tracking and positioning system. The invention adopts a blue and green laser synchronous time synchronization mechanism and a hydroacoustic frequency hopping mechanism to solve the problems of synchronous error and multi-path interference in the prior short-baseline hydroacoustic positioning system respectively.

Description

technical field [0001] The present invention relates to the communication field, and more specifically, relates to an underwater target tracking and positioning method and system. Background technique [0002] The underwater acoustic positioning system mainly refers to the tracking and positioning of objects in local areas or the navigation system of ships. According to the distance between primitives (receivers or interrogators), hydroacoustic positioning systems can be divided into long baseline systems, short baseline systems and ultra-short baseline systems. [0003] The Chinese invention patent application with the publication number CN101246215A and the publication date of August 20, 2008 is based on a long baseline positioning system, which consists of a differential GPS reference station, an underwater transceiver, a GPS buoy, and a ship-based control center. The time difference between the signal of the transceiver and each GPS buoy (at least 4) is used to calculat...

AI Technical Summary

Problems solved by technology

[0010] Aiming at the defects and deficiencies in the existing short-baseline underwater acoustic positioning system, the primary purpose of the present invention is to provide an underwater target tracking and positioning method, which solves the existing problems by adopting blue-green laser synchronous time synchronization and underwater acoustic frequency hopping mechanism respectively. There are synchronization errors and multipath interference problems that exist in short-baseline hydroacoustic positioning systems

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