Non-linear constrained least square-based single station positioning method

A nonlinear constraint and least squares technology, applied in positioning, wireless communication, radio wave measurement system, etc., can solve problems such as dependence, high positioning accuracy, and reduce algorithm complexity

Active Publication Date: 2017-09-08
CHONGQING UNIV OF POSTS & TELECOMM
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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 po

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  • Non-linear constrained least square-based single station positioning method
  • Non-linear constrained least square-based single station positioning method
  • Non-linear constrained least square-based single station positioning method

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Embodiment Construction

[0073] Below in conjunction with specific embodiment and accompanying drawing, the present invention is described in further detail:

[0074] Such as figure 1 As shown, the single-station positioning method based on nonlinear constrained least squares described in the present invention comprises the following steps:

[0075] Step 1: Construct the NLOS signal propagation model of the macrocell single station according to the macrocell signal propagation characteristics, such as figure 2 shown. Assuming that the signal reaches the base station from the mobile station after a single reflection, the base station is located at the origin of the coordinates, the MS is located on the X axis with the BS as the origin of the coordinates, and the scatterers S are distributed around the MS. In a macro-cellular environment, the antenna of the base station is generally at a higher position, so There are no scatterers around. The present invention only considers the situation that LOS (...

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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 invention relates to the field of positioning technology, in particular to a single-station positioning technology under a macro-cellular NLOS environment. Background technique [0002] In 1996, the Federal Communications Commission of the United States announced the E911 positioning requirements, which required that before October 2001, various wireless cellular networks must be able to provide positioning services with an accuracy within 125m for mobile stations that issue E911 emergency calls, and meet this positioning accuracy The probability should not be lower than 67%; and after 2001, it is required to provide higher positioning accuracy and three-dimensional position information. The publication of the E911 technical specification 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 positio...

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Application Information

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IPC IPC(8): H04W64/00G01S5/02
CPCG01S5/0257H04W64/006
Inventor 田增山舒月月李勇
Owner CHONGQING UNIV OF POSTS & TELECOMM
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