A Deterministic Direct Data Domain Approach to Signal Estimation Utilizing Nonuniform and Uniform 2-D Arrays
A Deterministic Direct Data Domain Approach to Signal Estimation Utilizing Nonuniform and Uniform 2-D Arrays
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DOI：
10.1006/dspr.1997.0308
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发表时间：
1998-04
期刊：
影响因子：
--
通讯作者：
T. Sarkar;S. Nagaraja;M. Wicks
中科院分区：
文献类型：
--
作者：
T. Sarkar;S. Nagaraja;M. Wicks
提出了一种在强干扰、杂波和热噪声存在的情况下，利用非均匀阵列自适应估计输入信号强度的直接数据域确定性方法。该方法基于选择相邻天线输出的加权差，基于感兴趣信号的到达方向，以仅保留不需要的分量的方式。然后，这些不需要的信号被自适应加权置零。然后使用这些权重来估计一组采样时刻的信号强度。这种方法适合于高度变化的环境，特别是在存在闪烁干扰器和杂波特性快速变化的情况下，前提是感兴趣的信号在观察间隔期间没有显著变化。提出了两种主要的确定性方法--一种是基于广义特征值问题的求解，另一种是基于共轭梯度法的线性方程组的求解。将这些方法应用于非均匀和均匀二维阵，并对其结果进行了比较。
A direct data domain deterministic approach utilizing a nonuniform array to adaptively estimate the signal strength of an incoming signal in the presence of strong jammers, clutter, and thermal noise is presented. This method is based on choosing a weighted difference of neighboring antenna outputs, based on the direction of arrival of the signal of interest, in such a way that only the unwanted components remain. These unwanted signals are then nulled by adaptive weights. These weights are then used to estimate the signal strength for a set of sampling time instants. This approach is suited for a highly changing environment, particularly in the presence of blinking jammers and where clutter characteristics change rapidly, provided the signal of interest does not change significantly during the observation interval. Two main deterministic approaches are presented?one based on the solution of a generalized eigenvalue problem, the other based on the solution of a set of linear equations utilizing the conjugate gradient method. These methods are applied to nonuniform as well as uniform 2D arrays, and the results are compared.