A Cauchy score DOA estimator for monostatic MIMO radar in impulsive noise environment. Issue 4 (3rd April 2021)

• Record Type: Journal Article
• Authors: Xu, Letao; Wang, Shuman; Pan, Xiaoyi
• Is Part Of: International journal of electronics. Volume 108:Issue 4(2021)
• Page Start: 543
• Page End: 557
• Publication Date: 2021-04-03
• Subjects: DOA estimation -- monostatic MIMO -- Cauchy score function -- ESPRIT -- impulsive noise; Electronics -- Periodicals; Electronic control -- Periodicals; 621.381
• DOI: 10.1080/00207217.2020.1793403
• Languages: English
• ISSNs: 0020-7217

Abstract

ABSTRACT: It is interesting to determine the direction of arrival (DOA) of signals in the presence of impulsive noise for monostatic multiple-input multiple-output (MIMO) radar. Inspired by the robust statistics property of M-estimation theory and maximum likelihood estimation theory, a Cauchy score cost function is proposed to suppress the outliers, leading to robust DOA estimation. Firstly, the Cauchy score cost function for residual fitting error matrix of the radar data is derived. Then, an alternating convex optimisation algorithm based on the complex-valued Newton gradient descent is tailored to acquire an efficient solution for the Cauchy score cost function. Finally, using the signal subspace matrix obtained by the alternating convex optimisation algorithm, ESPRIT algorithm is adopted to provide a closed-form DOA estimations. Simulation results are presented to demonstrate the effectiveness of the proposed method.