Underwater positioning and navigation system and method based on DGPS

Abstract

The invention discloses an underwater positioning and navigation system and method based on the DGPS. The system is composed of GNSS satellites, at least four DGPS buoys and at least one underwater positioning and navigation receiver. The buoys receive GPS signals and are in wireless communication with one another so that DGPS positioning can be achieved. The buoys broadcast navigation signals to water. Frequency spread can be conducted on the navigation signals through pseudorandom frequency spread codes, wherein the frequency spread codes play a role of ranging codes at the same time. The underwater positioning and navigation receivers do not need to transmit signals outwards. The underwater positioning and navigation receivers resolve the positions of the underwater positioning and navigation receivers in the earth coordinates and the accurate positions of the underwater positioning and navigation receivers relative to a base station by means of the received navigation signals of the buoys. Time synchronization of the underwater positioning and navigation receivers and the UTC is achieved. Multiple underwater positioning and navigation receivers can be arranged in the system to simultaneously receive the navigation signals, and the number of the underwater positioning and navigation receivers is not limited. The underwater positioning and navigation system and method can be applied to the underwater exploration field, the under water construction field, the underwater security and protection field, the underwater navigation field and other fields.

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 sending and receiving underwater acoustic signals between the buoy and the transponder realizes positioning. Most of th...

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 buoys 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 (buoys), data centers, sea surface wireless communication links, and underwater wireless communication links

2. Underwater navigation receiver and buoy 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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