中文摘要：

针对TOA方法对时间测量精度要求高,但现有矿井WiFi通信系统通信过程中时间测量分辨率低的问题,提出了一种对WiFi信号进行二次扩频以获得高时间分辨率的TOA测距方法。在WiFi移动站上集成多载波扩频调制部件,用以对测距的WiFi信号进行二次扩频;在WiFi基站集成多载波扩频解调部件,并利用FPGA设计的高速数字匹配滤波器扩频码捕获算法,在亚码片级上对WiFi移动站发出的测距信号进行捕获,进而得到高分辨率的信号传播时延。试验结果表明,该方法测距误差均值为1.92m,能够为WiFi通信系统进行TOA定位提供可靠的测距值。

英文摘要：

TOA ranging method requests high precision time measurement while existing mine WiFi systems can not provide high temporal resolution timer.In order to resolve the above technical problems,a TOA ranging method using re-spread spectrum technology to WiFi signal to obtain high resolution was proposed.Multi-carrier spread spectrum modulator is integrated into WiFi mobile station which is used tospread spectrum for ranging WiFi signal.Correspondingly,multi-carrier spread spectrum demodulator is integrated into WiFi base station,and a spread spectrum code capture algorithm with high speed digital matched filter designed by FPGA is used to capture ranging signal sent by the WiFi mobile station in subchip level,thus,the signal propagation delay time with high resolution is obtained.The test results show that the proposed method can provide reliable ranging data with mean-error of 1.92 mfor TOA positioning of WiFi communication system.