摘要
在空间运动多站无源定位系统中,针对高速运动辐射源脉冲信号到达不同观测站的时差及其变化率估计,提出对观测时段中间时刻采用最小二乘估计(LSE)的方法,并对基于时差序列的直线拟合和二次曲线拟合方法的估计精度进行仿真分析。理论分析和仿真结果表明,时差序列随时间呈现高次非线性特性,当达到一定的观测时长或脉冲数量时,采用时差序列二次曲线LSE方法能够得到较高的时差和时差变化率估计精度。
In passive localization systems with multiple moving observers in space,a method by means of Least Squares Estimation(LSE)for parameters at middle observation period is proposed.The Time Difference Of Arrival(TDOA)and its change rate of pulse signals from high speed emitter to different observers are estimated.The estimation accuracy of linear fitting method and quadratic curve fitting method of TDOA sequence is simulated and analyzed.Theoretical analysis and simulation results show that TDOA sequence shows high-order nonlinear characteristics with time,and the LSE method of TDOA sequence based on conic can get higher estimation accuracy of TDOA and its change rate when a certain observation time or pulse number is reached.
作者
徐海源
苏成晓
刘亚奇
XU Haiyuan;SU Chengxiao;LIU Yaqi(Beijing Institute of Remote Sensing Information,Beijing 100011,China)
出处
《电子信息对抗技术》
北大核心
2022年第3期26-30,共5页
Electronic Information Warfare Technology
关键词
无源定位
时差
时差变化率
最小二乘估计
passive location
Time Difference Of Arrival(TDOA)
time difference rate of change
Least Squares Estimation(LSE)
