High-precision and fast positioning method based on toa mode in non-line-of-sight environment

Abstract

A high-precision fast positioning method based on the TOA mode in a non-line-of-sight environment. The basic positioning equation between the mobile station and each base station is obtained according to the distance observation value; the basic positioning equation between the mobile station and the base station corresponding to the minimum distance observation value is selected. The positioning equation is used as the reference equation, and the basic positioning equation between other mobile stations and the base station is subtracted from the reference equation to obtain the standard form of least squares; the expression form of the L1 norm is constructed and converted into an expression of the L1 norm with additional linear constraints form; give the iterative process of the alternative direction method to obtain the positioning solution of the mobile station; bring the positioning solution into the L1 norm expression to obtain the absolute value residual, if the maximum absolute value residual and the absolute value residual If the median ratio is greater than the preset value, the positioning solution of the mobile station is output; otherwise, the basic positioning equation between the mobile station and the base station corresponding to the next distance observation value is used as the reference equation. The invention can reduce the influence of the non-line-of-sight error on the positioning accuracy.

Description

technical field [0001] The invention belongs to the technical field of wireless positioning, and in particular relates to a high-precision fast positioning method based on a TOA mode in a non-line-of-sight environment. Background technique [0002] Due to the complexity of the environment, after the signal is sent from the sending end, there are often different degrees of occlusion during the process of reaching the receiving end, thereby introducing non-line-of-sight (NLOS) errors. Especially in the field of indoor positioning and 5G positioning, the existence of non-line-of-sight errors will seriously reduce the accuracy and performance of the positioning system. The most serious consequence is that the positioning results will diverge, resulting in the failure of positioning results. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a high-precision fast positioning method based on the TOA mode in a non-line-of-...

AI Technical Summary

Problems solved by technology

[0002] Due to the complexity of the environment, after the signal is sent from the sending end, there are often different degrees of occlusion in the process of reaching the receiving end, thus introducing non-line-of-sight (NLOS) errors

Especially in the field of indoor positioning and 5G positioning, the existence of non-line-of-sight errors will seriously reduce the accuracy and performance of the positioning system. The most serious consequence is that the positioning results will diverge, resulting in the failure of positioning results.

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