CAJ | 학술논문

针对脉冲噪声环境下多径时延估计的分辨率问题,提出了一种基于共变谱（CS）和信号估计参数旋转不变技术（ESPRIT）的多径时延估计方法。采用α稳定分布建模脉冲噪声,依据分数低阶统计量理论,将两接收信号的共变序列进行傅里叶变换得到共变谱。CS看作等效的时间序列,把时域的多径时延估计问题转化为频域的多个正弦信号频率估计问题。利用ESPRIT对等效时间序列进行频率估计,得到高分辨率的多径时延估计。仿真实验表明：多径时延估计方法（CS_ESPRIT）在高斯和脉冲噪声环境中均具有较好的估计性能。
침대맥충조성배경하다경시연고계적분변솔문제,제출료일충기우공변보（CS）화신호고계삼수선전불변기술（ESPRIT）적다경시연고계방법。채용α은정분포건모맥충조성,의거분수저계통계량이론,장량접수신호적공변서렬진행부리협변환득도공변보。CS간작등효적시간서렬,파시역적다경시연고계문제전화위빈역적다개정현신호빈솔고계문제。이용ESPRIT대등효시간서렬진행빈솔고계,득도고분변솔적다경시연고계。방진실험표명：다경시연고계방법（CS_ESPRIT）재고사화맥충조성배경중균구유교호적고계성능。
To deal with resolution of multipath time delay estimation in the impulsive noise, a method for estimating multipath time delay is proposed based on covarianee spectrum （CS） and estimation signal parameter via rotational invariance technique（ESPRIT）. The α-stable distribution is used to model the impulsive noise. CS is obtained from FFT of the covariance sequence of the two received signals based on the theory of fractional lower order statistics. Thus, multipath time delay estimation is converted to a problem of multi-frequency estimation for CS is a sequence in the time domain. High resolution multipath time delay can be obtained with ESPRIT. The method is termed CP-ESPRIT in this paper. Computer simulation shows that the method has satisfactory performance both in Gaussian and impulsive noise environments.