Underwater sensor network positioning method based on distance measurement correction

Abstract

The invention discloses an underwater sensor network positioning method based on distance measurement correction, and the method mainly comprises the following steps of (1) carrying out the pre-positioning of a node, obtaining the distance between a beacon and the node through a distance measurement algorithm, and obtaining the pre-positioning position of the node through a multilateral positioning algorithm; (2) based on the accurate positioning of the distance measurement correction, reducing the distance measurement errors by utilizing a geometrical relationship between nodes, and calculating to obtain the accurate positions of the nodes. According to the scheme, the error correction caused by the limitation of a traditional positioning algorithm to node movement is broken through, andby starting from the beginning distance measurement error in the positioning process, the pre-positioning position of the node is obtained through the basic node positioning algorithm, then the geometric relation between the node positions is used for correcting the distance measurement error, so that the accurate position of the node is obtained, and the positioning precision is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of underwater wireless sensor networks, and in particular relates to an underwater sensor network positioning method based on ranging correction. Background technique [0002] In recent years, with the rapid development of the marine economy, underwater wireless sensor networks have attracted much attention, providing sufficient technical support for marine resource detection, and are widely used in marine environmental governance, natural disaster prevention, and military defense. Positioning technology is one of the key technologies of underwater wireless sensor networks; because underwater wireless sensor networks use underwater acoustic communication methods different from land communications, and the underwater environment is complex, ground node positioning methods cannot be directly applied to underwater wireless sensor networks. . [0003] In underwater wireless sensor networks, due to the complex u...

AI Technical Summary

Problems solved by technology

Positioning technology is one of the key technologies of underwater wireless sensor networks; because underwater wireless sensor networks use underwater acoustic communication methods different from land communications, and the underwater environment is complex, ground node positioning methods cannot be directly applied to underwater wireless sensor networks.

[0003] In underwater wireless sensor networks, due to the complex underwater environment, there are many factors that cause node positioning errors, such as ranging errors, node movement, etc.; many existing underwater wireless sensor network positioning technologies are based on ranging In underwater wireless sensor networks, underwater acoustic channels have special characteristics such as narrow bandwidth, high propagation delay, and severe multipath scattering, which will lead to large ranging errors, which will greatly affect the performance of ranging-based positioning algorithms. Accuracy, underwater pressure, water temperature, and salinity have a great impact on underwater acoustic communication, making ranging errors the main source of errors in positioning algorithms; currently, most underwater positioning algorithms do not take this into account. One influencing factor, but focus on the error research caused by node movement

[0004] For the commonly used TP-TSFLA algorithm and SLA algorithm, these two algorithms need to measure the distance between the beacon node and the unknown node or between the beacon node and the beacon node in practical application. As we all know, as long as the distance is measured There will be ranging errors, but the above two algorithms do not consider the factor of ranging errors, which leads to large ranging errors; in order to solve the problem of poor measurement accuracy caused by ranging errors in underwater sensor networks, it is urgent to propose a A new positioning method that can correct the ranging error. By studying the geometric relationship between the position of the beacon node, the position of the unknown node containing the ranging error, and the true position of the unknown node, the ranging error is corrected to improve the positioning accuracy.

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