期刊
REMOTE SENSING
卷 13, 期 19, 页码 -出版社
MDPI
DOI: 10.3390/rs13193938
关键词
array antenna; extended Kalman filter; array signal processing; target tracking; direction of arrival estimation
This article proposes two methods based on EKF and FD processes for estimating the elevation angle of a low-angle isolated target. These methods show excellent performance in different multipath environments and low SNR conditions, making them suitable for low-peak-power radars.
In a low-angle tracking situation, estimating the elevation angle is challenging due to the entrance of the multipath signals in the antenna's main lobe. In this article, we propose two methods based on the extended Kalman filter (EKF) and frequency diversity (FD) process to estimate the elevation angle of a low-angle isolated target. In the first case, a simple weighting of the per-frequency estimates is obtained (termed WFD). Differently, in the second case, a matrix-based elaboration of the per-frequency estimates is proposed (termed MFD). The proposed methods are completely independent of prior knowledge of geometrical information and the physical parameters. The simulation results show that both methods have excellent performance and guarantee accurate elevation angle estimation in different multipath environments and even in very-low SNR conditions. Hence, they are both suitable for low-peak-power radars.
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