Environment self-adaption multi-target direct locating method

A positioning method and self-adaptive technology, applied in electrical components, wireless communication, etc., can solve problems such as decreased positioning accuracy

Inactive Publication Date: 2013-05-08
NANJING NORMAL UNIVERSITY
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Problems solved by technology

However, this method ignores the influence of the time-varying characteristics of the actual channel, so the positioning accuracy of this method will drop significantly in the actual environment

Method used

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  • Environment self-adaption multi-target direct locating method
  • Environment self-adaption multi-target direct locating method
  • Environment self-adaption multi-target direct locating method

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Embodiment Construction

[0040] In order to better understand the technical solution of the present invention, the working process and beneficial effects of the present invention will be described in detail below in conjunction with the drawings and specific embodiments.

[0041] In this embodiment, the number of base stations is 4, and the coordinates of the 4 base stations are respectively (500m, 500m), (500m,-500m), (-500m,-500m), (-500m, 500m), with symbols , n∈{1,2,3,4} represents. Base station 1 is selected as the positioning center, and the base stations can communicate with each other. Each base station is equipped with a uniform linear array antenna (Uniform Linear Array, ULA), the number of antenna elements is 10, the element interval is taken as half of the signal wavelength, and the signal carrier frequency is 900MHz. Using the Greenstein model (Greenstein, L.J., Ereeg, V., Yeh Y.S., and Clark, M.V., 'A new path-gain / delay-spread propagation model for digital cellular channels', IEEE Tra...

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Abstract

The invention discloses an environment self-adaption multi-target direct locating method which comprises that a locating center first performs grid point division on a location area and assembles point coordinates into a set; then an ideal dictionary pre-established according to a known base station and the point coordinates; the locating center utilizes two steps of an off-line dictionary study method and on-line dictionary study method to dynamically adjust the ideal dictionary and enables the ideal dictionary to be adapted to dynamic change of signal environments, furthermore, loose signals are reconstructed, the grid point position corresponding to a non-zero value in a sparse vector is the determined position of a moving terminal, and the number of the non-zero value is the number of the targets to be located. According to the environment self-adaption multi-target direct locating method, feature parameters of signal delay, angles, strength and the like do not need to be estimated. Due to the fact that the two-step dictionary study methods can enable the ideal dictionary to be adapted to the environments, high locating precision can be obtained, and simultaneously, the method does not need to let a user know the number of the targets to be located in advance.

Description

technical field [0001] The invention belongs to the technical field of wireless positioning, in particular to a method for wireless positioning using wireless communication facilities. 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 military operations 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 Global Positioning System (GPS) in the United States, the Galileo system in Europe, the GLONASS system in Russi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W64/00
Inventor 柯炜张晗博殷奎喜
Owner NANJING NORMAL UNIVERSITY
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