Node location method for underwater sensor network

Abstract

The invention belongs to the technical field of underwater wireless sensor network application. Aiming at the problems of positioning accuracy and beacon node redundancy in the distributed underwater mobile sensor network node positioning method without ranging, the present invention provides a node positioning method for underwater sensor networks, which is divided into two steps: the first step , to establish a hierarchical relationship. First, a single beacon node is deployed at one end of the deployment area. The beacon node broadcasts its own positioning information, and a tree structure is established with the beacon node as the root to achieve the first layering. Then, the beacon nodes are sequentially Move to other borders of the deployment area, and divide the hierarchy multiple times; in the second step, the node determines the area it belongs to according to the obtained hierarchical information, and then further narrows the area where the node is located by exchanging information with neighboring nodes, and calculates the node coordinates. The present invention uses only one beacon node in the positioning process and adopts a layered and refined manner, effectively solving the problems of redundant beacon nodes and low precision.

Description

technical field [0001] The invention belongs to the technical field of underwater wireless sensor network applications, and in particular relates to a node positioning method of an underwater sensor network. Background technique [0002] In recent years, with the continuous improvement of the utilization rate of marine resources, the positioning requirements for the information collected by underwater sensor network nodes are getting higher and higher. However, the communication signal transmission medium of ocean and land is completely different, so that the mature electromagnetic signal cannot be used in the ocean environment. In addition, the underwater environment is full of complexity and unknowns, and the node positioning algorithms on land cannot be directly used in the underwater environment. The energy of underwater sensor nodes is limited, unlike terrestrial equipment that can maintain sufficient energy supply at any time. The underwater sensor nodes should maint...

AI Technical Summary

Problems solved by technology

However, its signal loss model needs to be further improved, and its signal loss model has a great impact on positioning accuracy

Each positioning of a node to be tested requires the cooperation of 2 to 4 beacon nodes. With the expansion of the deployment area, the number of beacon nodes required increases sharply, resulting in redundancy of beacon nodes and a significant increase in deployment costs, and even It may happen that the number of beacon nodes for positioning assistance is higher than the number of nodes to be tested

Although the positioning accuracy has been improved compared with other algorithms, in the case of a large number of beacon nodes for auxiliary positioning, the positioning accuracy is low, and it is difficult to meet the positioning requirements of some applications.

Images