Research For Effect Of Array Aperture On Doa Of Wideband

Direction-of-Arrival is one of the most important contents of array signal processing. With the development of communication technology, it has been applied widely in many different fields. In order to improve the performance of algorithm, a lot of reformations have been proposed. However, all these reformations will increase the complexity of algorithm and the amount of calculation. Therefore this article will mainly analyze the influence of array aperture on the performance of localized algorithm and two kinds of methods by which algorithm performance can be improved through the way of augmenting array aperture. The specific work is as follows:Firstly, array model and signal models of receiving arrays under all kinds of structures is discussed. The Multiple Signal Subspace (MUSIC) algorithm is considered. The influence of array aperture on the performance of localized algorithm is analyzed. The conclusion is that the algorithm performance can be improved by only augmenting array aperture without reforming algorithm itself.Secondly, to deal with the problem of too much amount of calculation caused by adding array elements, the location method based on beam space high resolution will transfer the algorithm process from array element space to beam space. The dimension of the covariance matrix is lowered and the amount of calculation is reduced. Through analysis we know that compared with array region high resolution, this method has simpler and less amount of calculation as well as better algorithm performance.At last, to deal with the problem that algorithm fails when space between array elements is longer than half signal wavelength; a method of Focus Frequency Selection which is suitable for broadband signal is raised. This method can not only improve the precision of DOA estimation algorithm through augmenting array aperture but also eliminate the restriction of DOA estimation algorithm caused by array space and make the most use of broadband frequency without adding any amount of algorithm calculation.The feasibility of the algorithm has been verified by Matlab Simulations.