A Precise Positioning Method Based on Emergency Cellular Communication Network

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...

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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

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