HIGH-RESOLUTION FREQUENCY-WAVENUMBER SPECTRUM ANALYSIS
HIGH-RESOLUTION FREQUENCY-WAVENUMBER SPECTRUM ANALYSIS
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DOI：
10.1109/proc.1969.7278
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发表时间：
1969-01-01
影响因子：
20.6
通讯作者：
CAPON, J
中科院分区：
文献类型：
--
作者：
CAPON, J
一个sansor数组的输出被认为是一个齐次随机场。在这种情况下，这个场有一个谱表示，类似于平稳随机过程的谱表示，它由行波的叠加组成。频率-波数功率谱密度提供了这些波的振幅的均方值，并且在通过传感器阵列分析传播波中具有相当重要的意义。频率-波数功率谱密度估计的传统方法使用固定波数窗口，并且其分辨率基本上由传感器阵列的波束图案确定。介绍了一种高分辨率的估计方法，该方法采用波数窗口，其形状变化并且是获得估计的波数的函数。结果表明，该方法的波数分辨率明显优于常规方法。应用这些结果的地震数据从位于蒙大拿州东部的大孔径地震台阵。此外，高分辨率方法的其他领域，如雷达，声纳和射电天文学的应用，指出。
The output of an array of sansors is considered to be a homogeneous random field. In this case there is a spectral representation for this field, similar to that for stationary random processes, which consists of a superposition of traveling waves. The frequency-wavenumber power spectral density provides the mean-square value for the amplitudes of these waves and is of considerable importance in the analysis of propagating waves by means of an array of sensors. The conventional method of frequency-wavenumber power spectral density estimation uses a fixed-wavenumber window and its resolution is determined essentially by the beam pattern of the array of sensors. A high-resolution method of estimation is introduced which employs a wavenumber window whose shape changes and is a function of the wavenumber at which an estimate is obtained. It is shown that the wavenumber resolution of this method is considerably better than that of the conventional method. Application of these results is given to seismic data obtained from the large aperture seismic array located in eastern Montana. In addition, the application of the high-resolution method to other areas, such as radar, sonar, and radio astronomy, is indicated.