Underwater object precision positioning system and method

Abstract

The invention discloses an underwater object precision positioning system and a method. The system comprises a mother ship, a computer with a plurality of serial ports, a desk computer, an ultra short base line positioning system, a differential GPS (global positioning system), a compass, an ROV (remote-operated vehicle) system, a forward-looking sonar camera, a low-illuminance black and white video camera, an attitude indicator and a temperature-salinity depth profiling instrument. A shore-based transceiver, an ROV water surface system unit and the like of the ultra-short base line positioning system are carried by the mother ship, and underwater system units such as a transponder of the ultra-short base line positioning system, the forward-looking sonar camera and the like are carried by an ROV submersible vehicle, so that the underwater object precision positioning system is formed. By the aid of acoustic positioning between the shore-based transceiver and the transponder of the ultra-short base line positioning system and acoustic positioning of forward-looking sonar, the shortcoming that an existing underwater GPS positioning system only can position an object carried with anacoustic response device in a water area is overcome, and longitude and latitude coordinates of an optional unknown object in an optional water area can be positioned in a WGS (world geodetic system)84 ellipsoidal coordinate system in real time.

Description

technical field [0001] The invention relates to the technical field of underwater GPS positioning, in particular to an underwater target precise positioning system and method. Background technique [0002] At present, people's exploration of the ocean, which accounts for more than 70% of the earth's surface area, has not made great progress compared with the exploration of space. One of the main reasons is that the "field of view" is narrow. Electromagnetic wave is a kind of radiation wave, so it can propagate in air and vacuum, and it is the fastest known matter, so it is the basis for detecting and transmitting information in the universe; the main carrier for detecting and transmitting information in the ocean is Sound wave, sound wave is a kind of mechanical wave, which relies on the medium to propagate. Its propagation ability in the ocean is very strong, up to tens of thousands of nautical miles. The lower the frequency, the farther the propagation distance, but the lo...

AI Technical Summary

Problems solved by technology

[0004] There are two main types of existing underwater GPS: one is the long-baseline surface buoy system, which can track, monitor and dynamically locate underwater targets from the sea surface, coastal land or aircraft. The positioning accuracy is high, but the calibration is complicated and can only be Positioning of underwater targets with acoustic transponders in a fixed water area; the other is to use a mother ship with ultra-short baseline shore-based transceivers and GPS to locate underwater targets. This system is flexible, but the positioning the target must also have an acoustic transponder

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