SUBSAMPLE TIME DELAY ESTIMATION BASED ON PHASE SPECTRUM OF BAND LIMITED STOCHASTIC SIGNALS  

基于带限随机信号相位谱的分数延时估计方法(英文)

作　　者：柏业超[1,2] 张兴敢[1,2] 唐岚[1,2] 

机构地区：[1]南京大学电子科学与工程系 [2]东南大学移动通信国家重点实验室

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2010年第2期170-175,共6页南京航空航天大学学报（英文版）

基　　金：Supported by the National Mobile Communications Research Laboratory Foundation (N200902)~~

摘　　要：The accuracy of conventional time delay estimation （TDE） algorithms is limited by the sampling interval. A novel algorithm of subsample TDE suitable for widehand signals is presented to improve the accuracy. This algorithm applies periodogram and parabolic interpolation to the cross correlation spectrum of band limited stochastic signals, and can obtain a continuous time delay estimator. Simulations are carried out to compare the performance of the proposed algorithm with that of other subsample TDE algorithms. Results show that the proposed algorithm outperforms other algorithms and reachs the Cramer-Rao lower bound （CRLB） at a high signal- to-noise ratio. For the wideband characteristic and the randomness of the transmitting signal, the proposed algo- rithm is suitable for the low probability of intercept radars.传统延时估计方法的精度受采样间隔的限制。为提高精度,提出一种新的适用于宽带信号的分数延时估计方法。该方法将周期图法与抛物线插值应用于带限随机信号的互相关谱,可以获得连续的延时估计。文中通过一系列仿真实验对该方法与其他分数延时估计方法的性能进行比较。结果表明,该方法的性能优于其他估计方法,在信噪比较高的情况下,可以接近克拉美罗下界。由于发射信号具有宽带和随机的特点,该方法适用于低截获概率雷达。

关 键 词：parameter estimation time delay cross-power density spectra INTERPOLATION PERIODOGRAM 

分 类 号：TN958.92[电子电信—信号与信息处理]