NLOS transmission environment wireless positioning method based on TROA

Abstract

The invention discloses an NLOS transmission environment wireless positioning method based on TROA. The method comprises the steps that 1, signals sent by a mobile station (MS) are received by a plurality of base stations (BS), the information of time of arrival (TOA) in the signals is extracted and collected into a positioning main base station, and the number of positioning base stations is not smaller than 4; 2, the measurement value of the main base station is used as a reference, the measurement TOA of the other base stations is divided by the reference value to be converted into the time ratio of arrival (TROA); 3, according to the geometric positioning principle, when the number of the positioning base stations is not smaller than 4, a positioning equation set with the TROA as the parameter is built; 4, linear processing is carried out on the positioning equation set; 5, the equation set is solved, positioning is carried out, and a coordinate estimation value of the MS is obtained. By the adoption of the NLOS transmission environment wireless positioning method, the phenomenon that the NLOS error is enlarged along with increasing of the distance is effectively restrained, and the positioning precision is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of wireless positioning, in particular to a wireless positioning method for an NLOS transmission environment. Background technique [0002] Wireless positioning refers to a technology that uses parameters such as angle and distance included in the received signal to estimate the position of the mobile terminal. In recent years, due to economic development and the needs of people's lives, this technology has been widely used. It can provide services including emergency calls, travel information services, vehicle management, etc., and has also been applied to charging based on location information Systems and intelligent transportation systems are an important part of the Internet of Things. [0003] In the actual wireless transmission environment, due to the existence of obstacles, the signal will not be transmitted along a straight line during the period from the sending end to the receiving end, and it oft...

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Problems solved by technology

[0004] In order to overcome the shortcomings of the existing NLOS transmission environment wireless positioning method that the NLOS error increases with the increase of the distance and the positioning accuracy is poor, the present invention provides a time-of-arrival method that effectively improves the positioning accuracy when the NLOS error increases with the increase of the distance. Wireless positioning method for NLOS transmission environment based on quotient (TROA, time ratio of arrival)

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