Abstract: Based on linear pulse-width modulation signal technology，this paper uses CSMA/CA and TDMA combination agreement.According to noise，multipath interference and dynamic adjustment of transmission rates and frame length，it can ensure optimal throughput and accurate and reliable location information，it has strong anti-jamming and large coverage.The double-side two-way symmetrical ranging algorithm is designed in the base stations and terminals in order to improve the accuracy of distance measuring.The test system is designed，from which it shows that the one-dimensional ranging accuracy is less than 1 meter，and in the mine roadway the ranging distance can reach 60 meters，and with a certain non-line-of-sight capacity.

Key words: linear frequency pulse, high precision ranging, non-line-of-sight, Symmetrical Double-Sided Two-Way Ranging（SDS-TWR）

摘要： 基于线性脉宽调制信号技术，采用CSMA/CA 和 TDMA相结合的协议，根据噪声、干扰和多径等动态调整传输速率和帧长，以确保最优化的吞吐量和准确可靠的定位信息，并具有强抗干扰性，大覆盖距离。在基站和终端设计并采用了双边双路对称测距算法，以提高测距精度。设计了实验系统，结果表明一维测距精度可以稳定在1米，应用于矿井下的巷道内传输距离可以达到60米，具备一定的超视距能力。

关键词: 线性调频脉冲, 高精度测距, 超视距, 双边双路对称算法