The Research Of 2-D DOA Algorithms Based On The Uniform Circular Array

Array signal processing is an important part in the field of signal processing,which is widely used in the domain of wireless communication,radar,sonar,etc.The doa estimation of uniform circular array(UCA)in the course of Array signal processing plays a crucial role in military and civil applications,so the research topic in this article has a certain theoretical and practical application significance.This paper firstly studies the DOA estimation algorithm of uniform linear array,especially 2-D DOA estimation algorithm for uniform linear array.Then the author analyzes the mathematical model of uniform circular array,according to the characteristics of circular array structure model to linearize the uniform circular array and improves estimate doa of uniform circular array to estimate the rotation of the invariant subspace algorithm which is verified by MATLAB simulation.Under the condition of a coherent signal source,by using the virtual translation along the vertical direction spatial smoothing technique,the author has realized the coherence of coherent signal solution.The improved algorithm is verified by MATLAB simulation for which can not only eliminate the interference of the coherent source,discern the azimuth Angle and elevation Angle of the effective signal,but can reduce the operation time and improve the resolution.When the incoming signal is a broadband signal,the author in this paper puts forward a revised focusing algorithm,which is mainly using the integral operation to achieve decoherence;by screening the effective narrow-band signal to make focusing changed,thus improving the resolution;for the noiseless matrix array,the bilateral relevant has been changed to guarantee the unbiased estimation of DOA.The author has proved the feasibility of the algorithm through the MATLAB simulation and analyzed the performance impact of parameters in the revised algorithm and number of arrays,etc.