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A Precise Positioning Method Based on Emergency Cellular Communication Network

A cellular communication network and precise positioning technology, applied in the field of precise positioning based on the emergency cellular communication network, can solve the problems of inability to achieve positioning in places without GPS signals, hindering rescue operations, and backward rescue communication and positioning equipment

Active Publication Date: 2019-11-08
THE THIRD MEDICAL CENT OF THE CHINESE PEOPLES LIBERATION ARMY GENERAL HOSPITAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The use of the Global Positioning System (GPS: Global Positioning System) has greatly improved the accuracy of wireless positioning, so that the positioning accuracy can reach the meter level, but positioning cannot be achieved in places without GPS signals
For example, at disaster sites such as earthquakes, GPS signals are often lost due to obstructions, which is not conducive to the development of disaster relief work.
[0003] my country is a country with frequent natural disasters. At present, we have not yet established a complete emergency communication and positioning system. The development of rescue technology is relatively slow, and rescue communication and positioning equipment are relatively backward. For example, in Sichuan on May 12, 2008 During the catastrophic earthquake rescue operation, the satellite communication network was completely paralyzed in the early stage, which seriously hindered the rescue operation

Method used

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  • A Precise Positioning Method Based on Emergency Cellular Communication Network
  • A Precise Positioning Method Based on Emergency Cellular Communication Network
  • A Precise Positioning Method Based on Emergency Cellular Communication Network

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Embodiment Construction

[0066] The present invention will be further described below through specific examples.

[0067] The specific steps of the positioning method for the mobile station in this embodiment are as follows:

[0068] 1) The positioning server receives the mobile station information forwarded by the M base stations, and the positioning server obtains the geographic location information of the M base stations; wherein M is greater than or equal to 4;

[0069] Let the location information of the i-th base station be (x i ,y i ), where i∈[1,M];

[0070] 2) The positioning server extracts the receiving time of all M base stations receiving the mobile station information, and calculates the information arrival time difference t between the jth base station and the first base station j,1 , where 2≤j≤M;

[0071] Using the propagation speed c of electromagnetic waves in the atmosphere, the distance difference r between the jth base station and the first base station can be calculated j,1 ...

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Abstract

The invention discloses an emergency cellular communication network-based precise positioning method for realizing the wireless location based on time measurement values. According to the method, firstly, relatively accurate TDOA values are obtained. Secondly, according to an appropriate positioning algorithm, the calculation is conducted on above parameters to determine the specific location of a mobile terminal. On the basis that relatively accurate TDOA values are obtained, the invention provides a TDOA Chan positioning algorithm combined with attenuation factors. The simulation result of the positioning algorithm shows that, the method can be applied in complex channel environments, wherein the TDOA measurement error is relatively small and the measurement accuracy is relatively high. The Chan algorithm is a solution of a non-recursive hyperbolic equation set that is provided with an analytical expression. The above algorithm is small in calculated amount. On the condition that the TDOA error noise follows the Gaussian distribution, the algorithm is high in positioning accuracy. However, due to the obstruction of an obstacle, the positioning error is always larger. In order to eliminate the influence of the obstacle, the gross error of the calculation result is removed based on the Chauvenet criteria. Therefore, the estimation accuracy is further improved.

Description

technical field [0001] The invention relates to the fields of signal processing, mobile communication and the like, in particular to an accurate positioning method based on an emergency cellular communication network. Background technique [0002] The use of the Global Positioning System (GPS: Global Positioning System) has greatly improved the accuracy of wireless positioning, so that the positioning accuracy can reach the meter level, but positioning cannot be achieved in places without GPS signals. For example, at disaster sites such as earthquakes, GPS signals are often lost due to obstructions, which is not conducive to the development of disaster relief work. [0003] my country is a country with frequent natural disasters. At present, we have not yet established a complete emergency communication and positioning system. The development of rescue technology is relatively slow, and rescue communication and positioning equipment are relatively backward. For example, in S...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04W64/00
Inventor 郑静晨李明李晓雪郝昱文李争平秦朝亮
Owner THE THIRD MEDICAL CENT OF THE CHINESE PEOPLES LIBERATION ARMY GENERAL HOSPITAL
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