Direction of arrival accuracy improvement through estimation of spatial coherence loss function in non-homogeneous environments

作者：Gholipour Atefeh; Zakeri Bijan; Mafinezhad Khalil^*

来源：International Journal of Electronics, 2017, 104(4): 709-721.

DOI：10.1080/00207217.2016.1242166

• Direction-of-arrival estimation
• imperfect spatial coherence
• multiplicative noise
• non-homogeneous media

Performance of direction of arrival (DOA) estimation is significantly degraded in practical situations. One of the conditions that decreases its performance, is the coherent loss caused by the propagation of the wavefront through random non-homogeneous media. Most of the previous methods, such as matrix fitting method and covariance matching technique, need the multidimensional search; therefore their computations are difficult and not suitable for a real-time application. In this paper, a three-stage method based on the generalised eigenvalues utilising signal subspace eigenvectors (GEESE) and Gauss-Newton (GN) algorithms, namely 3SM/GE-GN, is presented. Simulation results show the effectiveness of the proposed method. Difference of RMSE of DOA estimation between proposed method, which is independent of the coherent loss, and other methods is more clearly visible in higher snapshots. As well, in fixed snapshot, the RMSE of the proposed method is lower than others in different SNRs. Furthermore, the computational time of the simulation is very lower than two previous works.

• 出版日期2017-4