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Hole-Free Coprime Array for DOA Estimation: Augmented Uniform Co-Array
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DOI：10.1109/LSP.2020.3044019.png)
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The coprime array owns a sparse array structure, which can effectively alleviate mutual coupling, while the holes existing in the difference co-array(DCA) greatly reduce the number of uniform degrees of freedom(uDOFs). In this letter, we propose a new coprime array structure called hole-free coprime array (HFCA) by carefully assembling the subarrays, and the resulting HFCA can generate a hole-free DCA. Furthermore, we derive the optimal HFCA that can produce the largest hole-free DCA with a given number of sensors, which contributes to an increase of uDOFs compared with existing coprime array structures. In addition, the simulations are provided to demonstrate the superiority of HFCA in terms of uDOFs, direction of arrival estimation performance, and spatial resolution.
Keyword:
Direction-of-arrival estimation
Direction of arrival estimation
coprime array
difference co-array
uniform degree of freedom
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9.6
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1.1W
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1.7W
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