Abstract
Sparse arrays can increase the array aperture and degrees of freedom through the construction of either sum or difference co-arrays or both. In order to exploit the advantages of sparse arrays while estimating directions of arrival (DOAs) of a mixture of circular and non-circular signals, in this paper, a gridless DOA estimation method is proposed by employing a recently introduced enhanced nested array, whose virtual arrays have no holes. The virtual signals derived from both sum and difference co-arrays are constructed based on atomic norm minimization. It is shown that the proposed method also works when the circular and non-circular signals come from the same set of directions. Simulation results are provided to demonstrate the performance of the proposed method.
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Data Availability Statement
The data included in this study may be available upon reasonable request by contacting with the corresponding author.
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Acknowledgements
This work is sponsored by the National Natural Science Foundation of China under Grant Nos. 61871282 and 62001256, the Key Laboratory of Intelligent Perception and Advanced Control of State Ethnic Affairs Commission under Grant MDIPAC-2019102, and by Zhejiang Provincial Natural Science Foundation of China under Grant No. LQ19F010002.
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Teng, L., Wang, Q., Chen, H. et al. Atomic Norm-Based DOA Estimation with Sum and Difference Co-arrays in Coexistence of Circular and Non-circular Signals. Circuits Syst Signal Process 40, 5033–5053 (2021). https://doi.org/10.1007/s00034-021-01708-7
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DOI: https://doi.org/10.1007/s00034-021-01708-7