一种基于内插采样的时差测量与基站同步技术  

A time difference measurement and clock synchronization technology based on interpolating sampling

作　　者：刘双龙[1] 张春[1] 黄钰[1] 王志华[1] 

机构地区：[1]清华大学微电子所清华信息科学与技术国家实验室,北京100084

出　　处：《电路与系统学报》2013年第2期173-177,共5页Journal of Circuits and Systems

基　　金：国家高技术研究发展(863)计划"RRAM设计IP和嵌入式应用验证"(2011AA010404)资助项目

摘　　要：针对TDOA定位系统中的高精度时差测量问题,介绍并分析了一种基于内插采样的时差测量技术。与传统的时差测量方法相比,该方法将时钟量化误差转变为对基准信号相位的测量,从而消除了传统时差测量中的原理性误差。本文对该方法进行了理论分析与计算机仿真,仿真结果表明在当前的器件性能下能够实现70ps以内的时差测量精度。同时基于内插采样的高精度时差测量技术能够应用于TDOA定位系统中的基站时钟同步中,有效降低了基站时钟同步误差,进一步提高了时差定位系统的定位精度。A method based on interpolating sampling technology is proposed in this paper to achieve high precision time difference measurement in TDOA location system. Compared with traditional methods, this method converts the clock quantization error＇s measurement to the phase measurement of reference signals, thus completely eliminating the traditional methods＇ principle error. Theoretical analysis and MATLAB simulation are discoursed fully in the paper. Results show that a time difference measure precision within 70 ps can be achieved under the current device performance. This technology can also be used for the clock synchronization of base stations in TDOA location system. The clock synchronization error will be effectively reduced. So the positioning accuracy shall be further improved as well.

关 键 词：到达时间差(TDOA) 时差测量 内插采样 时钟同步 

分 类 号：TN47[电子电信—微电子学与固体电子学] TN98