CAJ | 학술논문

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.
침대비시거맥충초관대(IR-UWB)정위응용중,비상간TOA(Time of Arrival)고계산법정도적불족,제출료일충기우쌍문한화사솔(Double-Threshold and Slope,DTS)적수체신호시간고계산법.수체로경(Direct Path,DP)경과초시고계지후,근거능량채양서렬최대치여최소치적사솔,의합출최우귀일화문한표체식;재연합UWB쌍지수신도모형적특점대쌍문한검측산법가이개진,실현TOA고계.재비시거배경하방진、비교료DTS산법여궤충IR-UWB상용TOA산법적평균절대오차(MAE).방진결과표명해산법재불동UWB신도화신조비배경하균획득료우이적오차성능.
Aimming to improve the accuracy of ultra-wideband positioning under Non-Line-Of-Sight(NLOS)environment, a non-coherent 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 Error(MAE)of the proposed algorithm is compared with other IR-UWB TOA estimations under NLOS environ-ment. Simulations verify the outstanding performance of this scheme in different UWB channels and SNR environments.