Positioning method and mobile station for suppressing non-line-of-sight error

Abstract

The invention discloses a positioning method for inhibiting non-line-of-sight error and a mobile table, and relates to the technical field of wireless positioning. The positioning method comprises the following steps: the mobile table acquires position coordinate information of three base stations and multi-group propagation time measurement values, wherein each group propagation time measurement value comprises the propagation time between the mobile table and each base station; the mobile table determines the error between the non-line-of-sight and the line-of-sight corresponding to each group propagation time measurement value based on a geometrical distance constraint relation between the mobile table and each base station and the position coordinate information of each base station; the mobile table selects one group propagation time measurement value, which enables the error between the non-line-of-sight and the line-of-sight to minimum, for mobile table positioning. Therefore, multi-group measurement values are acquired and the measurement value most approach to the LOS propagation is screened out based on a geometrical constraint relation, which should be satisfied under the line-of-sight propagation environment, of the mobile table and the base station, the measurement value error caused by NLOS is effectively reduced, and the advanced sampling is unnecessary, and the efficiency is higher.

Description

technical field [0001] The invention relates to the field of wireless positioning, in particular to a positioning method for suppressing non-line-of-sight errors and a mobile station. Background technique [0002] In wireless network positioning, the irrational channel environment will lead to non-line-of-sight (NLOS) propagation of signals. How to reduce the measurement error caused by NLOS propagation is the key to improving the accuracy of wireless positioning. [0003] The existing commonly used method to eliminate NLOS errors is the identification and elimination method, which judges whether the measured data contains NLOS errors based on prior information, and eliminates them through reconstruction weighting and other methods. This type of method requires sampling data in the early stage, and the calculation is complex and the response time is slow. . Contents of the invention [0004] A technical problem to be solved by the present invention is: how to reduce the ...

AI Technical Summary

Problems solved by technology

[0003] The existing commonly used method to eliminate NLOS errors is the identification and elimination method, which judges whether the obtained measurement data contains NLOS errors based on prior information, and eliminates them through reconstruction weighting and other methods. This type of method requires sampling data in the early stage, and the calculation is complex and the response time is slow.

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