Positioning method and device in non-line of sight environment

Abstract

The embodiment of the invention discloses a positioning method and device in a non-line of sight environment. The method and the device are applied in a server. The method comprises following steps of obtaining original TDOA (Time Difference of Arrival) values from every two base stations to a terminal when signals synchronously sent by at least three base stations arrive at the terminal, wherein the signals are related to same service data; obtaining the strength values of all signals of each base station arriving at the terminal; calculating the average time delay generated by non-line of sight propagation signals of each base station arriving at the terminal; obtaining target TDOA values from every two base stations in the at least three base stations to the terminal; determining three target feature points corresponding to the at least three base stations according to the obtained target TDOA values, thus obtaining the approximate line of sight difference values from every two base stations in the at least three base stations to the terminal; and solving the position coordinate of the terminal at a positioning point. Through application of the embodiment of the invention, the problem of low positioning precision resulting from non-line of sight errors in the non-line of sight environment is solved, and the positioning precision in the non-line of sight environment is improved.

Description

technical field [0001] The invention relates to the technical field of wireless positioning, in particular to a positioning method and device in a non-line-of-sight environment. Background technique [0002] Wireless positioning has been widely used in military and civilian technology. With the rapid development of cellular networks such as CDMA, cellular mobile communication systems are showing a momentum of rapid development. Various services based on terminal location in the network, such as public safety services, Emergency alarm services, billing based on terminal location, vehicle and traffic management, navigation, network planning and design, improvement of network QoS and wireless resource management, etc., are all related to accurate positioning of terminal locations. [0003] Among them, the TDOA (Time Difference of Arrival, Time Difference of Arrival) positioning method is a terminal positioning method in a cellular network. This method has relatively low require...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the embodiments of the present invention is to provide a positioning method and device in a non-line-of-sight environment, which is used to solve the problem of low positioning accuracy due to the existence of non-line-of-sight errors when signals propagate in a non-line-of-sight environment, and improve Positioning accuracy in non-line-of-sight environments

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