Sparse array design has significant implications for improving the accuracy of direction of arrival(DOA)estimation of non-circular(NC)*** propose an extended nested array with a filled sensor(ENAFS)based on the hole-f...
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Sparse array design has significant implications for improving the accuracy of direction of arrival(DOA)estimation of non-circular(NC)*** propose an extended nested array with a filled sensor(ENAFS)based on the hole-filling ***,we first introduce the improved nestedarray(INA)and prove its ***,we extend the sum-difference coarray(SDCA)by adding an additional sensor to fill the *** the larger uniform degrees of freedom(uDOFs)and virtual array aperture(VAA)can be abtained,and the ENAFS is ***,the simulation results are given to verify the superiority of the proposed ENAFS in terms of DOF,mutual coupling and estimation performance.
This paper proposes a new extended nested array geometry with enhanced degrees of freedom (DOF) and a hole-free difference co-array. The proposed flexible extendednested with multiple subarrays (f-ENAMS) configuratio...
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ISBN:
(纸本)9789082797091
This paper proposes a new extended nested array geometry with enhanced degrees of freedom (DOF) and a hole-free difference co-array. The proposed flexible extendednested with multiple subarrays (f-ENAMS) configuration is constructed by splitting the dense subarray of the nestedarray (NA) into four subarrays and relocating them on either side of the NA configuration to maximize the DOF. Several conditions are provided for a specific design to guarantee the continuity of the difference co-array (DCA). Compared to other sparse arrays, f-ENAMS offers improved DOF, which leads to high-resolution DOA estimation. Simulation examples are presented to demonstrate the superiority of the proposed f-ENAMS array configuration.
Recently, the design of sparse arrays for direction-of-arrival (DOA) estimation has gained considerable attention due to their ability to yield a sizeable virtual aperture, enhanced degrees-of-freedom (DOF), and high-...
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Recently, the design of sparse arrays for direction-of-arrival (DOA) estimation has gained considerable attention due to their ability to yield a sizeable virtual aperture, enhanced degrees-of-freedom (DOF), and high-resolution DOA estimation. This paper presents a flexible extended nested array with multiple subarrays (f-ENAMS), whereby the sensors from the dense uniform subarray of a nestedarray (NA) are further distributed, and the NA's DOF is thus improved. Essentially, the dense subarray of NA is split into four sections and distributed equally on either side of NA's sparse subarray to array aperture while maintaining a hole-free difference co-array (DCA). In this regard, this paper proposes a new extended nested array structure named f-ENAMS, which achieves the same higher DOF capacity as the two-sided extended nested array (TS-ENA). Moreover, an improved f-ENAMS is proposed by relocating further sen-sors from the dense subarrays of f-ENAMS. As a result, the improved f-ENAMS possess more DOF than other existing extended NAs. For simplicity, the former is called f-ENAMS-I, and the latter is f-ENAMS-II. Both f-ENAMS arrays have closed-form expressions for sensor positions and a hole-free DCA. Numerical examples verify the superiority of the f-ENAMS arrays in terms of achievable DOF, weight functions, and DOA estimation performance.(c) 2022 Elsevier B.V. All rights reserved.
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