Time division-synchronization code division multiple access (TD-SCDMA) system-based method for accurately positioning underground personnel

Abstract

The invention discloses a time division-synchronization code division multiple access (TD-SCDMA) system-based method for accurately positioning underground personnel. The method comprises the following steps of acquiring time of arrival (TOA) and an angle of arrival (AOA) of a signal at a base station; de-noising a TOA value by using an improved kalman filtering algorithm; calculating a time difference of arrival (TDOA) value according to the de-noised TOA value; estimating the position of a mobile station by using a TDOA / AOA mixed Chan algorithm and a TDOA / AOA mixed Taylor algorithm; performing first data fusion on a position estimated value by using a weighted residual method to obtain a new position estimated value; and performing second data fusion on the position estimated value by using Bayesian inference to obtain the final position estimated value. By the method for accurately positioning the underground personnel, the advantages of a TD-SCDMA system and the superiority of the data fusion are utilized, a TDOA / AOA mixed data fusion positioning algorithm is adopted, the positioning accuracy is high, and the problem that the personnel in an underground coal mine are hard to position is solved.

Description

technical field [0001] The invention belongs to the technical field of mobile communication, in particular to an accurate positioning method for underground personnel based on a TD-SCDMA system. Background technique [0002] The underground production environment of coal mines is complex and harsh, and major disasters and casualties in mines caused by various natural disasters occur from time to time. Through the analysis of various mine disasters, there are many reasons for the heavy casualties, one of the important reasons is the lack of an accurate positioning system, which makes it impossible to know and master various production information and personnel information in the mine in a timely manner. When an emergency is about to occur, the staff cannot be evacuated and evacuated in time, resulting in casualties. It can be seen that it is very important to obtain the precise location of underground workers in time after a mine disaster occurs. However, the particularity o...

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Problems solved by technology

[0004] The present invention provides an accurate positioning method for underground personnel based on the TD-SCDMA system, and aims to solve the problem that the current positioning of underground personnel basically adopts reading at the wellhead of the mine or at other key passages in the underground by using a radio frequency card (RFID). The method records and tracks the downhole personnel. This method has short effective working time, missed reading, low positioning accuracy and single function, which cannot meet the requirements of high-precision and high-efficiency personnel positioning in the underground.

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