基于Kalman滤波的目标信号TOA测量校正  

TOA Measurement Calibration Based on Kalman Filtering

作　　者：徐自励[1] 刘昌忠[1] 黄忠涛[1] 何东林[1] 

机构地区：[1]中国民用航空局第二研究所,四川成都610041

出　　处：《通信技术》2010年第6期194-197,203,共5页Communications Technology

基　　金：国家自然科学基金项目(批准号:60672176);国家自然科学基金重点项目(批准号:60736045);国家863项目(编号:2009AA12Z329)

摘　　要：多点定位系统中,目标信号TOA测量精度直接决定了系统对目标的定位精度,而目标信号TOA测量精度取决于提供系统时钟的晶振的准确度和稳定度。针对多点定位系统中目标信号TOA测量准确度的具体问题,分析晶振频率偏移和GPS秒脉冲抖动对TOA测量准确度的影响,导出基于Kalman滤波的目标信号TOA测量校正方法。数值仿真证明此方法可以有效地改善目标信号TOA的测量准确度,对提高多点定位系统定位性能具有较强的现实意义与实用价值。For multilateration,the positioning accuracy is directly determined by signal TOA measurement of a target,while the TOA accuracy depends on the preciseness and stability of the crystal oscillator’ which provides the clock for the system.Aiming at the TOA measurement of multilateration,the impact of frequency offset and GPS PPS on TOA measurement accuracy is analyzed,and the algorithm of TOA measurement calibration based on Kalman filtering is derived.Numerical simulation shows that this algorithm could effectively raise the TOA measurement accuracy,and is of practical value in improving the performance of multilateration system.

关 键 词：多点定位 TOA测量 频率偏移 GPS秒脉冲 KALMAN滤波 

分 类 号：TN912.3[电子电信—通信与信息系统]