3种远震P波到时拾取方法的比较及其参数优化

分析了自回归赤池信息准则（AR-AIC）、高阶统计量（HOS）和累积和（CUSUM）等3种到时拾取方法中参数对远震P波到时估计的影响，以450个远震P波信号为样本集，参考人工拾取到时，以网格搜索方式确定了每种方法的最优参数。之后重新选取信噪比处于[2，20]区间的100个远震P波信号，用确定最优参数后的3种到时拾取方法估计其P波初至时间，并比较了3种方法对低信噪比远震P波的拾取准确度。结果表明，AR-AIC方法和CUSUM方法对低信噪比远震P波的拾取准确度要优于HOS方法，CUSUM方法的计算速度最快，HOS方法由于其原理的限制更适用于信噪比较大、初动较尖锐的信号。 

A comparative study on three methods of onset-time determination for teleseismic P arrivals and parameters optimization

This paper analyzed the effect of parameters on estimation of onset times for teleseismic P waves by AR-AIC （auto-regression Akaike information criterion）, HOS （higher order statistics） and CUSUM （cumulative sums） methods. The parameters of each method were optimized in the way of grid searching by taking 450 teleseismic P phases as sample set and the manual picked arrival times as reference. And then 100 teleseismic P phases were reselected with SNR between 2 and 20, and the onset times were estimated by the three methods with optimized parameters, so as to evaluate the accuracy of estimation for low-SNR teleseismic P phases. The results show that the accuracy of estimated phase arrival times by the AR-AIC and CUSUM methods is better than by the HOS method, the calculation speed by the CUSUM method is the fastest, and the HOS method is better applied to high-SNR and sharp onset signals.