Identification method for non-visual path and mobile terminal positioning method

A mobile terminal and path technology, applied in electrical components, wireless communication, etc., can solve the problems of inaccurate NLOS identification and inaccurate positioning of mobile terminals, and achieve the effect of reducing the probability of wrong identification and improving positioning accuracy

Inactive Publication Date: 2012-07-04
SPREADTRUM COMM (SHANGHAI) CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0015] The purpose of the present invention is to provide a non-visible path identification method to solve the problem that the mobile terminal cannot be accurately positioned in the cellular mobile communication network due to inaccurate NLOS identification in the prior art

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  • Identification method for non-visual path and mobile terminal positioning method
  • Identification method for non-visual path and mobile terminal positioning method
  • Identification method for non-visual path and mobile terminal positioning method

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Embodiment Construction

[0033] The specific embodiments of the present invention will be described below in conjunction with the accompanying drawings.

[0034] see figure 1 As shown, it is a flow chart for implementing the identification method of the non-visual path of the present invention, the method includes the following steps:

[0035] Step S101, calculating the cost function of the time-of-arrival measurement value from the mobile terminal to the base station;

[0036] At a single moment j, the mobile terminal goes to the mth base station BS m Time-of-arrival measurements for is defined by:

[0037] TOA m j = TOA m 0 + NLOS m j + n m j

[0038] in, For the mobile terminal to the mth base station BS m the actual arrival time of is the error caused by the non...

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Abstract

The invention discloses an identification method for a non-visual path and a mobile terminal positioning method, and aims to provide a method for identifying the non-visual path to position a mobile terminal only by utilizing a line-of-sight propagation path in honeycomb mobile communication. Key points of the technical scheme are that: cost functions of time difference of arrival (TDOA)/time of arrival (TOA) measured values between the mobile terminal and base stations are calculated, and non-line of sight (NLOS) base stations and LOS base stations are identified; and the position of the mobile terminal is calculated according to the positions of the LOS base stations and the TDOA/TOA measured values. The base stations with NLOS propagation are accurately identified, and the mobile terminal is positioned only by the LOS propagation path according to the positions of the base stations and the TDOA/TOA measured values between the mobile terminal and the base stations in a positioning process, so that the aim of improving positioning accuracy is fulfilled.

Description

technical field [0001] The invention relates to a non-visible path identification method and a mobile terminal positioning method, in particular to a method for locating a mobile terminal by identifying a non-visible path in cellular mobile communication and only utilizing a line-of-sight propagation path. Background technique [0002] In the cellular network mobile terminal positioning system, due to the existence of uncertain obstacles in the wireless transmission environment, the direct path of electric wave transmission between the mobile terminal and the base station is blocked, and the electric wave will be reflected, refracted, and diffracted. The non-line of sight (NLOS) propagation mode propagates, and as a result, the electromagnetic signal experiences more time delay, which brings a larger error to the positioning. Nokia's on-site measurement results show that the average NLOS error in the GSM network environment reaches 500-700 meters, and Korea Telecom's measure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W24/08H04W64/00
Inventor 冷欣董霄剑
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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