Multi‐mode propagation mode localisation and spread‐Doppler clutter suppression method for multiple‐input multiple‐output over‐the‐horizon radar. Issue 8 (1st August 2019)

• Record Type: Journal Article
• Authors: Yu, Wenqi; Chen, Jianwen; Bao, Zheng
• Is Part Of: IET radar, sonar & navigation. Volume 13:Issue 8(2019)
• Page Start: 1214
• Page End: 1224
• Publication Date: 2019-08-01
• Subjects: direction‐of‐arrival estimation -- Doppler radar -- radar detection -- matrix algebra -- radar clutter -- blind source separation -- radar signal processing -- MIMO radar -- least squares approximations -- statistical analysis -- spatial filters -- ionospheric electromagnetic wave propagation; MIMO‐OTHR -- novel multimode SDC suppression method -- full‐mode spatial separation -- elevation angle -- cost function -- single‐mode component analysis -- slow‐time Doppler information -- SS‐SOBI methods -- output signal‐to‐clutter‐plus‐noise ratio -- estimated DOD -- SR method -- multimode propagation mode localisation -- spread‐Doppler clutter suppression method -- multimode spread‐Doppler clutter -- stratified ionosphere -- detection performance -- multiple‐input multiple‐output over‐the‐horizon radar system performance -- lingering effect mitigation -- direction of departure estimation -- direction of arrival estimation -- DOD estimation -- DOA estimation -- mode localisation -- matrices bi‐orthogonality -- least square criterion -- systematic multistage decomposition -- spatial filtering -- angle error reduction -- slow ship detection -- propagation mode -- transmit‐receive cascade refinement searching step; Signal processing -- Periodicals; Radar -- Periodicals; Sonar -- Periodicals; Electronics in navigation -- Periodicals; Navigation -- Periodicals; 621.3848
• DOI: 10.1049/iet-rsn.2018.5479
• Languages: English
• ISSNs: 1751-8784

Abstract

Abstract : Multi‐mode spread‐Doppler clutter (SDC), caused by a stratified ionosphere, affects the detection performance of over‐the‐horizon radar on slow ships. To improve a multiple‐input multiple‐output over‐the‐horizon radar (MIMO‐OTHR) system's performance and to mitigate the lingering effect of SDC, a novel multi‐mode SDC suppression method based on full‐mode spatial separation is proposed here. Furthermore, authors' method can estimate the elevation angle of direction of departure (DOD) and direction of arrival (DOA), contributing to mode localisation. By applying the bi‐orthogonality of matrices, the cost function of single‐mode component analysis is constructed under a least square criterion. By iteratively solving for the cost function, and by applying a systematic multistage decomposition, the elevation DOD and DOA and the slow‐time Doppler information of each mode are obtained sequentially. Compared with classical SOBI and SS‐SOBI methods, the proposed method improves the output signal‐to‐clutter‐plus‐noise ratio for spatial filtering. The estimated DOD and DOA do not need to be paired, reducing the angle error inherent in the SR method while performing the transmit‐receive cascade refinement searching step. Simulation results demonstrate the excellent performance of the proposed method, which is beneficial to improve the ability of MIMO‐OTHR to detect slow ships and determine the propagation mode.