基于二次判决的差分匹配滤波器时间戳估计

摘要

在深入分析差分匹配滤波器法标记应答信号前导单脉冲过0点时间戳的基础上,针对高信噪比情况下到达时间(TOA,time of arrival)检测精确度依然存在的问题,提出了基于二次判决的差分匹配滤波器过0点检测与时间戳标记方法,并通过差分匹配滤波器输出信号的过0点分布、TOA测量精确度和多点定位(MLAT,multilateration)系统定位精确度三方面的仿真实验验证了改进方法在过0点检测的准确性和稳健性.模拟仿真结果表明:改进算法具有时间戳标记准确度高、TOA测量精确度高和初始定位精确度高的优点,且随着输入信号信噪比的增大,改进算法的TOA检测均方根误差趋近于0.在信号信噪比大于20 dB时,应用于MLAT系统的定位误差小于0.87 m.%Timestamped mark of single-pulse zero-crossing of differential response filter is analyzed aiming at the problem of TOA detection accuracy under high SNR(signal-to-noise ratio).Improved differential matching filter based on quadratic decision is proposed.Through zero-crossing distribution,TOA measurement of root mean square error and MLAT system positioning accuracy are employed to verify the improved algorithm in zero-crossing detection accuracy and robustness.Simulation results show that the improved algorithm has higher accuracy of timestamp mark, TOA measurement and initial positioning accuracy. With the increase of SNR of the input signal,the improved square root error of improved algorithm approaches to zero.When the SNR is greater than 20 dB,the accuracy of MLAT system is less than 0.87 m.