Mine TOA ranging method based on re-spread spectrum to WiFi signal
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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1.92 m，能够为WiFi通信系统进行TOA定位提供可靠的测距值。Abstract: 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 to spread 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 sub-chip 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 m for TOA positioning of WiFi communication system.
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期刊类型引用(8)
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