Time difference on arrival (TDOA) locating method based on circumferentially distributed monitoring nodes

Abstract

The invention discloses a time difference on arrival (TDOA) locating method based on circumferentially distributed monitoring nodes, which is mainly used for solving the traditional problem of a bigger error of a target node coordinate obtained by locating by utilizing a Chan algorithm aiming at the circumferentially distributed monitoring nodes and a target node which is located in the range of a radius distant from 0.2 times of a circle center. The method is implemented as follows: carrying out calculation for multiple times to obtain coordinates of a plurality of target nodes by utilizing the Chan algorithm according to a known TDOA measured value and a monitoring node position coordinate; carrying out statistical average on locating coordinates in a threshold which is 0.2 times of a circumferential radius; and taking the coordinate obtained through the statistical average as an initial value of a Taylor algorithm, then calculating the coordinate of the target node, and carrying out statistical average on the obtained locating coordinate to obtain a final coordinate value of the target node. The invention has the advantages of small error and exact locating coordinate, and can be used for realizing precise locating of the target node.

Description

technical field [0001] The invention belongs to the technical field of communication, relates to wireless communication technology, in particular to a time difference of arrival (TDOA) positioning method, which can be used for positioning target nodes in cellular networks, wireless sensor networks or other networks. Background technique [0002] With the rapid development of mobile communication technology, wireless positioning technology has become a must-have function for the next generation mobile communication system. Research results in recent years have shown that because there is no strict time synchronization requirement for target nodes and monitoring nodes, the TDOA positioning method can be applied to various types of networks, such as cellular networks and wireless sensor networks. And because of its low application cost and high positioning accuracy, it has attracted widespread attention and has been determined as a standard positioning method in 3GPP. [0003]...

AI Technical Summary

Problems solved by technology

However, in the current network positioning, since the positions of monitoring nodes are generally distributed on the circumference, for example, the base stations of the cellular network are distributed in a circle, and the radius of the circle is R, and a node outside the circle is selected as a reference node, so using the Chan algorithm The positioning coordinate error is small. If the monitoring node and the reference node are located on the circumference, when the target node is within 0.2R from the center of the circle, the positioning coordinate error obtained by using the Chan algorithm is too large, and the effective position of the target node cannot be obtained in the network.

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