Abstract
Nowadays, sparse multiple input and multiple output (MIMO) radar design
considers the difference coarray of the sum coarray (DCSC) concept and
the uniform degrees of freedom is improved significantly. Current sparse
MIMO arrays are designed based on transmit and receive arrays with
hole-free difference coarrays (DCAs). Recently, the uniform linear array
(ULA) fitting (UF) principle is proposed which aims to design sparse
arrays (SAs) with desired capacity using cascaded ULAs. However, SAs
designed via UF can not guarantee hole-free DCAs. In this letter, we aim
to use SAs designed via UF to devise sparse MIMO arrays with low mutual
coupling. Strategies of using SAs with non hole-free DCA to design
sparse MIMO arrays is introduced as well. Numerical simulations verifies
the good performance of the proposed sparse MIMO array in high coupling
scenarios.