An underwater pnt system with wide area coverage and autonomous monitoring

Abstract

An underwater PNT system with wide-area coverage and autonomous monitoring, including: a surface section, a user section, an underwater section, and a shore-based control center; The space-time reference is transmitted to the underwater section and information interaction; the user section is equipped with user terminals; the underwater section is equipped with an underwater PNT network, and the user terminal uses the underwater PNT network for underwater positioning, navigation and timing; the underwater PNT network is Configured as a regional network composed of submarine base station links constructed by multiple submarine base stations, the underwater PNT network has autonomous monitoring through the submarine base station links; the shore-based control center is used to monitor the work of the surface section, user section and underwater section state, and process the acquired data. The underwater PNT system has integrity monitoring function, inter-base station link function and wide-area service capability, communication integration function and remote communication function, and can be adaptively corrected according to the environmental characteristics of the sea area.

Description

technical field [0001] The invention relates to the field of underwater positioning, navigation and timing systems, in particular to an underwater PNT system with wide-area coverage and autonomous monitoring. Background technique [0002] On the water, it has an all-round, all-weather, all-time, high-precision satellite navigation system, which can provide global users with low-cost, high-precision three-dimensional position, speed and precise time PNT information. Underwater, in order to meet the needs of the rapidly developing underwater platforms for underwater positioning, navigation and timing, a global underwater positioning (P), navigation (N), and timing based on Beidou is provided. (T) system, which has the characteristics of small size, low power consumption, high concealment, high precision and long-time work, and is mainly composed of submarine base stations, surface buoys, shore-based control centers, and client terminals. [0003] As the main component of the ...

AI Technical Summary

Problems solved by technology

[0003] As the main component of the underwater PNT system, the submarine base station is anchored underwater during deployment and provides high-precision time-space reference for the underwater PNT system for a long time. However, due to natural environment or human factors, the time-space reference signal issued by the submarine base station The integrity of the network cannot be monitored in real time, resulting in the inability to achieve the purpose of wide-area coverage, mainly reflected in:

[0004] 1) The marine environment is very complex. Factors such as the absorption of signal energy by seawater, the temporal and spatial changes of environmental parameters, the inhomogeneity of seawater media, differences in seabed bottom, ocean currents, and internal waves limit the propagation of energy forms such as sound, light, and electricity. The distance restricts the coverage of underwater PNT information;

[0005] 2) The navigation network composed of submarine base stations has been deployed underwater for a long time. Due to natural factors (marine environment changes, submarine landslides, plate movements, etc.) Changes occur, and there are errors in the space-time reference, etc.;

[0006] 3) The submarine base station is deployed underwater, and its space-time reference signal cannot be monitored in real time. Especially when it is deployed on a large scale in the open sea, the accuracy, integrity, and availability of the space-time reference cannot be monitored in real time. In the case of deployment in different sea areas, it is necessary to consider Environmental adaptability and other issues

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