Underwater locating navigation system and method

Abstract

The invention discloses an underwater locating navigation system and method. The system is composed at least four base stations and at least one underwater locating navigation receiver. The base stations need to be synchronous in time, and the base stations are arranged on the water face, in water and underwater. The positions of the base stations are fixed, or the base stations can move. The base stations spread navigation signals into the water. Spectrum spreading is conducted on the navigation signals through a pseudorandom spreading code, and the spreading code has a function of a ranging code at the same time. The underwater locating navigation receiver does not need to emit a signal to the outside, the position of the underwater locating navigation receiver itself is solved and time synchronization with the base stations is achieved by receiving the navigation signals of the base stations. A plurality of underwater locating navigation receivers can be arranged in the system to receive the navigation signals at the same time, and the number of the underwater locating navigation receivers is not limited. The underwater locating navigation system and method can be applied to the fields of underwater exploration, underwater construction, underwater security and protection, underwater navigation and the like.

Description

technical field [0001] The invention relates to the field of underwater positioning and navigation, in particular to positioning and navigation and time synchronization technology under the condition of hidden underwater targets. Background technique [0002] Underwater navigation positioning Navigation technology has very important application value in the fields of marine monitoring, marine exploration, marine rights protection, underwater archaeology, underwater construction, underwater security and military. Acoustic-based underwater positioning and navigation systems are mainly divided into two categories according to the propagation path of underwater acoustic signals: two-way mode and one-way mode. [0003] The two-way mode is also called the answer mode, which requires the underwater positioning equipment to be equipped with a transponder. Two-way transmission and reception of underwater acoustic signals between the base station and the transponder realizes position...

AI Technical Summary

Problems solved by technology

The disadvantages are: 1. The underwater transponder needs to transmit acoustic signals to the outside world, which increases power consumption and has poor concealment

2. Due to the need for two-way sending and receiving signals, the number of underwater transponders is limited by the processing capacity of the base station and cannot be increased indefinitely

This method has the following limitations: 1. The required components of the system are huge, requiring at least 5 buoys (base stations), data centers, sea surface wireless communication links, and underwater wireless communication links

2. Underwater navigation receiver and base station need two-way communication

Underwater positioning and navigation receivers need to emit underwater acoustic signals, which consumes a lot of power and is not conducive to concealment

3. The number of underwater positioning and navigation receivers cannot be increased infinitely

4. The underwater navigation receiver cannot directly obtain its own position

Increases time required for positioning, reduces reliability

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