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Wireless location method for directly estimating and eliminating non-line-of-sight (NLOS) error

A non-line-of-sight, direct technology, applied in wireless communication, electrical components, etc., can solve the problem of high construction cost, achieve high positioning accuracy, reduce algorithm complexity, and wide applicability.

Inactive Publication Date: 2011-06-08
NANJING NORMAL UNIVERSITY
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  • Description
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Problems solved by technology

The disadvantage is that the construction cost is high, and frequent maintenance and updates are required, especially when the environment undergoes major changes, the database will almost need to be rebuilt

Method used

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  • Wireless location method for directly estimating and eliminating non-line-of-sight (NLOS) error
  • Wireless location method for directly estimating and eliminating non-line-of-sight (NLOS) error
  • Wireless location method for directly estimating and eliminating non-line-of-sight (NLOS) error

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Embodiment Construction

[0026] In order to better understand the technical solution of the present invention, in conjunction with the accompanying drawings, a further detailed description is as follows:

[0027] This embodiment only considers positioning using the Time of Arrival (TOA) method, which requires the participation of 3 or more base stations. The method includes the following steps:

[0028] 1) Establish the motion state equation of the mobile station

[0029] Assuming that the mobile station moves on a two-dimensional plane, the motion state at time k is represented by the vector Indicates that [x k ,y k ] represents the coordinates of the mobile station in the horizontal and vertical directions, represents the velocity in the corresponding direction. The equation of state considering random acceleration can be expressed as:

[0030] S(k)=ΦS(k-1)+ΓW(k) (1)

[0031] in

[0032] Φ = 1 0 ...

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Abstract

The invention discloses a wireless location method for directly estimating and eliminating non-line-of-sight (NLOS) error influence. The method comprises the following steps: firstly establishing a motion equation and an observation equation for wireless location, and then identifying that the current measured value is a line-of-sight (LOS) situation or an NLOS situation by virtue of innovation sum of squares of an extended kalman filter (EKF); for the LOS situation, carrying out position calculation and motion state estimation by directly utilizing the EKF; and for the NLOS situation, directly estimating the NLOS error by a nonlinear optimization method based on a geometrical relationship limiting condition, then eliminating the NLOS error by utilizing the corrected EKF, and carrying out high-precision location; and finally realizing online tracking of a mobile station by means of cyclical iteration. The wireless location method has the beneficial effects that influence of the NLOS error in wireless location can be effectively eliminated and location accuracy is obviously improved; and meanwhile prior statistical knowledge of the known NLOS error and LOS / NLOS transition probability are not required in the method, and calculation quantity meets the requirements for real-time application.

Description

technical field [0001] The invention relates to a method for wireless positioning by using a wireless communication network in a non-line-of-sight environment or a mixed line-of-sight / non-line-of-sight environment, and belongs to the technical field of wireless network positioning. Background technique [0002] Wireless positioning technology is widely used in search and rescue, intelligent transportation, logistics management, geological exploration and land development, navigation / aviation navigation and many other fields. Nowadays, in various fields of social and economic activities and daily life, geographical information with spatial location characteristics is playing an increasingly important role, and high-precision wireless positioning technology has also attracted more and more attention. [0003] Among the many wireless positioning systems, the most famous is the positioning system that sets radio transmission sources on various orbiting satellites, such as the Gl...

Claims

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Application Information

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IPC IPC(8): H04W64/00
Inventor 柯炜王婷婷黄晓琴周延怀王帆
Owner NANJING NORMAL UNIVERSITY
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