Direction Finding in Multipath Environment with Arbitrary Array

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 thenon-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 coloringthe noise because of these mappings we use a cumulant matrix instead of a covariance ones. In this method since we construct allthe subarrays virtually for detection of coherent signals we do not need the array with regular configuration. The advantages ofthis method are : increasing the array aperture, having the ability to find the DOAs with fewer sensors and also avoiding thecoupling between sensors as much as possible in contrast to conventional spatial smoothing.

Keywords:

Array interpolation , direction of arrival (DOA) , Music , Cumulant , uniform linear array (ULA