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无线传感网络中传感器节点的定位信息很重要,而精确的测距技术是获得传感器节点间可靠的距离信息所不可或缺的。在时钟系统中引入游标卡尺的原理,提出了高精度的RF飞行时间测量方法。2个异步时钟好像游标卡尺的主尺和副尺刻度一样,可以引出新的比原时钟频率高很多的虚拟时间分辨率。用2种异步时钟连续进行RF发射和接收,产生与RF信号传播时间有关的测量模式,由测量模式推测出RF传播时间。开发了短距离RF收发的实验系统,实验证明8 MHz的低分辨时钟系统可以测出12.5 ns的高分辨RF传播时间。
The location information of sensor nodes in wireless sensor networks is very important, and accurate ranging technology is indispensable for obtaining reliable distance information between sensor nodes. The principle of introducing vernier caliper in the clock system is proposed and a high-precision measurement method of RF flight time is proposed. 2 Asynchronous Clocks The main and sub-scale marks on a vernier caliper can lead to new virtual time resolutions much higher than the original clock frequency. Continuous RF transmission and reception with two types of asynchronous clocks generates a measurement mode related to the RF signal propagation time, from which the RF propagation time is estimated. Developed short-range RF transceiver experimental system, experiments show that 8 MHz low resolution clock system can measure 12.5 ns high resolution RF propagation time.