Abstract
In this paper, the problem of estimating the direction of arrival of signals of which some may be perfectly correlated is considered. This method can be applied in the situation that the non-Gaussian independent and coherent signals coexist with unknown Gaussian noise. In this method at first via mappings, the virtual uniform linear array (ULA) and also the shifted versions of this virtual ULA by assuming that all the DOAs are located in one section are constructed. In order to avoid coloring the noise because of these mappings we use a cumulant matrix instead of a covariance ones. In this method since we construct all the subarrays virtually for detection of coherent signals we do not need the array with regular configuration. The advantages of this method are: increasing the array aperture, having the ability to find the DOAs with fewer sensors and also avoiding the coupling between sensors as much as possible in contrast to conventional spatial smoothing.
Highlights
Direction finding techniques based on the eigendecomposition of the covariance matrix of the vector of the signals received by an array of sensors, have received considerable attention in years
In this method we need no extra sensors and subarrays so array aperture significantly increased means that we need only K + 1 sensors for detection of K coherent signals in contrast to conventional spatial smoothing that needs 2K sensors or FBSS that use 3 K sen
In the third simulation we show the performance of our method versus division index n in the presence of three predefined coherent signals
Summary
Direction finding techniques based on the eigendecomposition of the covariance matrix of the vector of the signals received by an array of sensors, have received considerable attention in years. An attempt to generalize the spatial smoothing technique based on cumulant to arbitrary array geometries (Sparse Array) by using the idea of interpolated array [8] is the main topic here. In this method we need no extra sensors and subarrays so array aperture significantly increased means that we need only K + 1 sensors for detection of K coherent signals in contrast to conventional spatial smoothing that needs 2K sensors or FBSS that use 3 K sen-.
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