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arXiv · 2204.07324

Joint DoA-Range Estimation Using Space-Frequency Virtual Difference Coarray

Zihuan Mao·Shengheng Liu·Yimin D. Zhang·Leixin Han·Yongming Huang
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Abstract

In this paper, we address the problem of joint direction-of-arrival (DoA) and range estimation using frequency diverse coprime array (FDCA). By incorporating the coprime array structure and coprime frequency offsets, a two-dimensional space-frequency virtual difference coarray corresponding to uniform array and uniform frequency offset is considered to increase the number of degrees-of-freedom (DoFs). However, the reconstruction of the doubly-Toeplitz covariance matrix is computationally prohibitive. To solve this problem, we propose an interpolation algorithm based on decoupled atomic norm minimization (DANM), which converts the coarray signal to a simple matrix form. On this basis, a relaxation-based optimization problem is formulated to achieve joint DoA-range estimation with enhanced DoFs. The reconstructed coarray signal enables application of existing subspace-based spectral estimation methods. The proposed DANM problem is further reformulated as an equivalent rank-minimization problem which is solved by cyclic rank minimization. This approach avoids the approximation errors introduced in nuclear norm-based approach, thereby achieving superior root-mean-square error which is closer to the Cramer-Rao bound. The effectiveness of proposed method is confirmed by theoretical analyses and numerical simulations.

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Zihuan Mao, Shengheng Liu, Yimin D. Zhang, Leixin Han, Yongming Huang. 2022-04-15. Joint DoA-Range Estimation Using Space-Frequency Virtual Difference Coarray. https://doi.org/10.1109/tsp.2022.3173150

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