类GPS超声定位系统及其多基站距离估计算法研究  

Research on Multiple Base-Stations Distances Estimation Algorithm in Quasi-GPS Ultrasonic Location System

作　　者：苏绍景[1] 程晓畅[1] 王跃科[1] 杜金榜[1] 

机构地区：[1]国防科技大学机电工程与自动化学院仪器系,长沙410073

出　　处：《传感技术学报》2007年第2期430-434,共5页Chinese Journal of Sensors and Actuators

摘　　要：针对常规超声波局部定位系统的缺陷,介绍了类GPS超声定位系统及其工作原理.建立了超声扩频测距时延估计模型,根据此模型提出了一种基于FFT的单基站距离估计快速算法.根据多基站接收信号的特点,在单基站距离估计算法的基础上,介绍了一种基于短时傅立叶变换(STFT)的多基站距离估计算法.实验研究表明,在获得发射信号载波频率先验知识的情况下,多基站距离估计算法运算量不大,并能精确得到距离估计值,从而为小车的精确定位奠定基础.In view of the deficiencies of the conventional ultrasonic location system, Quasi-GPS ultrasonic location system and its work principle are introduced. Then the ultrasonic spread-spectrum distance measurement Time Delay Estimation （TDE） model is established and the fast algorithm based for single basestation distance estimation based on FFT is presented on the above model. Considering of the specialties of the received signal in multiple base-station, the multiple base-station distance estimation algorithm based on STFT is introduced based on the single base-station distance estimation algorithm. It is proved by experiment that we can obtain exactly the distance estimation value by the above algorithm whose operation is not great, if we have the prior knowledge of the transmit signal carrier frequency.

关 键 词：类GPS 超声定位系统 时延估计 快速傅立叶变换 短时傅立叶变换 

分 类 号：TJ434.1[兵器科学与技术—火炮、自动武器与弹药工程]