A WSN-assisted positioning method for mobile anchor nodes based on helix

Abstract

The invention discloses a mobile anchor node WSN assistant location method based on a helical line. The method comprises the steps as follows: a coordinate system is established with the center of a square area as an origin, a helical line is drawn at a fixed interval as the movement path of an anchor node, and as the anchor node moves, a node to be located receives data packets broadcasted by the anchor node in a centralized way, and the coordinate of an unknown node is determined according to an angle value; and if two rounds of data are detected, the coordinate of the unknown node is determined according to the information of the round with smaller RSSI value. The collinearity problem of the traditional movement path can be well solved through the movement track of the helical line adopted in the invention, and the application value is high. The mobile anchor node uses a directional antenna which is of higher gain than an omni-directional antenna. The signal strength can be enhanced, and the anti-interference ability can be improved. The method is applicable to the deployment of an actual environment.

Description

technical field [0001] The invention belongs to the field of electronic technology, in particular to a helix-based mobile anchor node WSN assisted positioning method. Background technique [0002] Wireless sensor network (WSN) positioning technology is a key core supporting technology. Some topology control, routing selection, load balancing and other theories of WSN are very dependent on the unknown information of nodes. The basic technical principle of WSN positioning is that an unknown node estimates its own position by communicating with a small number of anchor nodes with known position information. In recent years, the research on WSN positioning methods has achieved a lot of research results. [0003] According to whether the positioning process needs to measure the distance, WSN node positioning can adopt the positioning method based on ranging and the positioning method without ranging. Among them, the positioning method based on ranging needs additional hardware s...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a helix-based mobile anchor node WSN assisted positioning method, aiming to solve the problem that the traditional positioning method is invalid due to the large error of GPS position information existing in the high-speed movement of the anchor node; the present invention utilizes the time parameter This high-precision measurement method replaces GPS position information, and essentially solves the inherent equipment error problem in the movement of anchor nodes. At the same time, deploying directional antennas on anchor nodes can effectively improve positioning coverage and practical value.

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