Abstract
This paper deals with joint estimation of direction-of-departure (DOD) and direction-of- arrival (DOA) in bistatic multiple-input multiple-output (MIMO) radar with the coexistence of unknown mutual coupling and spatial colored noise by developing a novel robust covariance tensor-based angle estimation method. In the proposed method, a third-order tensor is firstly formulated for capturing the multidimensional nature of the received data. Then taking advantage of the temporal uncorrelated characteristic of colored noise and the banded complex symmetric Toeplitz structure of the mutual coupling matrices, a novel fourth-order covariance tensor is constructed for eliminating the influence of both spatial colored noise and mutual coupling. After a robust signal subspace estimation is obtained by using the higher-order singular value decomposition (HOSVD) technique, the rotational invariance technique is applied to achieve the DODs and DOAs. Compared with the existing HOSVD-based subspace methods, the proposed method can provide superior angle estimation performance and automatically jointly perform the DODs and DOAs. Results from numerical experiments are presented to verify the effectiveness of the proposed method.
Highlights
As an innovative radar framework, multiple-input multiple-output (MIMO) radar system plays an important role in improving detection and estimation performance
We focus on the bistatic MIMO radar, which is a kind of the collocated MIMO radar
The bistatic MIMO radar is configured with M = 10 transmit elements and
Summary
As an innovative radar framework, multiple-input multiple-output (MIMO) radar system plays an important role in improving detection and estimation performance. MIMO radar can achieve superior performance compared with the traditional phase-array radar [1]. In terms of the antennas configuration, MIMO radar can be generally divided into two classes: statistical MIMO radar and collocated MIMO radar [2,3]. The former can deal with the scintillation problem by taking advantage of widely separated antennas and the latter can achieve unambiguous angle estimation with closely placed antenna arrays. We focus on the bistatic MIMO radar, which is a kind of the collocated MIMO radar
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