Single Station Location Method Based on Nonlinear Constrained Least Squares

Abstract

The invention discloses a non-linear constrained least square-based single station positioning method. The method comprises the steps of first, building an NLOS signal transmission model of a macro cell single base station according to a signal transmission characteristic of a macro cell; then, converting a positioning problem into a non-linear constraint least square problem by using a position relationship among a multi-path signal parameter, a base station, a target and a scatterer; resolving the least square problem by using an LM (Levenberg-Marquardt) algorithm; and when a residual is large, introducing an aquasi-Newton algorithm, and improving the LM algorithm so as to obtain a target estimation position. The method solves a problem that a traditional positioning algorithm depends on the number of base stations, performs positioning by using a single base station, does not need clock synchronization, and lowers the algorithm complexity; in the NLOS environment, the multi-path signal is used as a positioning path but does not suppress multiple paths, so that a problem of large positioning error in the NLOS environment is solved; the variable constraints are increased by using a ring model, so that the least square method is more effective, and the single station positioning of the macro cell reaches the positioning accuracy of 20-30 meters.

Description

Technical field [0001] The present invention relates to the field of positioning technology, in particular to a single-site positioning technology in a macro cell NLOS environment. Background technique [0002] In 1996, the United States Federal Communications Commission announced the E911 positioning requirements. It requires that before October 2001, various wireless cellular networks must be able to provide positioning services with an accuracy of 125m for mobile stations that make E911 emergency calls, and meet this positioning accuracy The probability should not be less than 67%; and it is required to provide higher positioning accuracy and three-dimensional position information after 2001. The publication of the E911 technical specifications has stimulated people’s enthusiasm for research on wireless positioning technology, and with the development of communication technology and the increasing popularity of mobile devices, people’s demand for positioning services for their...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to propose a single station positioning method based on nonlinear constrained least squares, which can solve the problem of dependence of traditional positioning algorithms on the number of base stations, and use a single base station for positioning without clock synchronization and reduce algorithm complexity degree; and high positioning accuracy

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