摘要
针对非视距脉冲超宽带(IR-UWB)定位应用中,非相干TOA(Time of Arrival)估计算法精度的不足,提出了一种基于双门限和斜率(Double-Threshold and Slope,DTS)的首达信号时间估计算法。首达路径(Direct Path,DP)经过初始估计之后,根据能量采样序列最大值与最小值的斜率,拟合出最优归一化门限表达式;再联合UWB双指数信道模型的特点对双门限检测算法加以改进,实现TOA估计。在非视距环境下仿真、比较了DTS算法与几种IR-UWB常用TOA算法的平均绝对误差(MAE)。仿真结果表明该算法在不同UWB信道和信噪比环境下均获得了优异的误差性能。
Aimming to improve the accuracy of ultra-wideband positioning under Non-Line-Of-Sigh（tNLOS）environment, a noncoherent TOA scheme is proposed by jointing double-threshold and slope estimations. By Direct Path（DP）search initially, the optimal normalized threshold fitting based on the slope of the maximum and minimum energy sample is obtained. Furthermore, double-threshold TOA estimation is adopted and improved by using the characteristics of double-exponent channel model. The Mean-Absolute Erro（rMAE）of the proposed algorithm is compared with other IR-UWB TOA estimations under NLOS environment. Simulations verify the outstanding performance of this scheme in different UWB channels and SNR environments.
出处
《计算机工程与应用》
CSCD
2013年第10期211-215,共5页
Computer Engineering and Applications
基金
国家自然科学基金(No.60962001
No.61172054)
广西自然科学基金(No.0991018z)
关键词
非视距脉冲超宽带(IR-UWB)
双门限算法
双指数信道模型
TOA估计
Ultra Wide Band Impulse Radio（IR-UWB）
double-threshold algorithm
double-exponent channel model
Time of Arriva（lTOA）estimation
