Journal
IET RADAR SONAR AND NAVIGATION
Volume 16, Issue 6, Pages 961-969Publisher
WILEY
DOI: 10.1049/rsn2.12234
Keywords
coprime array; degree of freedom; direction of arrival estimation; mutual coupling
Funding
- National Natural Science Foundation of China [62071476]
- China Postdoctoral Science Foundation [2021T140788, 2020M683728]
- Research Program of National University of Defence Technology [ZK20-33]
- Science and Technology Innovation Program of Hunan Province [2020RC2041, 2021RC3080]
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This study proposes a generalized and symmetric coprime planar array (GSCA) with high degrees of freedom and low mutual coupling. By optimizing the sensor number and constructing a virtual uniform rectangular array, the GSCA outperforms other arrays in terms of performance.
Degrees of freedom and mutual coupling are two important factors to determine the ability of direction of arrival (DOA) estimation. Although coprime planar array (CPPA) has less mutual coupling than hourglass array (HA) and ladder array (LA), its positive and negative covariance corresponding lags are discontinuous, resulting in low degrees of freedom. In this study, we propose a generalized and symmetric coprime planar array (GSCA) by employing the symmetric property of the difference co-array. By moving one subarray and introducing a supplementary subarray, we construct a connected virtual uniform rectangular array (URA). Through further optimizing the sensor number, the redundant lags are reduced and the array structure is more general. We show that the degrees of freedom are much higher than those of CPPA, HA and LA. Besides, the mutual coupling is close to CPPA, but less than HA and LA. The superiority of GSCA is verified by simulations.
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