Improved Method of Direction Finding for Non Circular Signals with Wavelet Denoising Using Three Parallel Uniform Linear Arrays

摘要

In this paper, two dimensional direction of arrival (2D-DOA) estimation of non circular signals using three parallel uniform linear arrays is addressed. Wavelet denoising is used as a preprocessing step to improve signal to noise ratio (SNR) of the received noise corrupted signal. Gain improved signal is then used for the 2D angle estimation. In this proposed work, we consider non circular signals where the real and imaginary part of received signal is not a independent random variable, so the imaginary part of the signals is also included, which resembles the real time situation. Thus, the array aperture is enlarged to get improved performance in angle estimation. The simulation results are compared with the existing literature of three parallel uniform linear arrays. The simulation results and analysis show that the proposed method has high accuracy and significant performance. Cramer Rao lower bound has been given for the reference.