Hole Locations and a Filling Method for Coprime Planar Arrays for DOA Estimation
Résumé
Coprime linear arrays (CLAs) have drawn lots ofattention. Efforts have been made to reveal the hole locations inthe difference coarrays of CLAs, based on which many methodshave been proposed to fill the holes, lengthening the consecutivedifference coarray part and increasing the effective degreesof freedom (DOFs). Compared with CLAs, two dimensional(2D) coprime planar arrays (CPAs) are more relevant to realapplications. However, no closed-form expressions for the holelocations in the difference coarray of a CPA have been foundin the open literature, and the advantage in terms of DOFs ofCPAs has not been well explored. In this letter, the structureof the difference coarrays of CPAs is investigated and the exactexpressions of all hole positions are provided. Then, a holesfillingmethod is proposed, by which the most critical holes inthe difference coarray can be filled such that a difference coarraywith more consecutive lags as well as higher effective DOFs canbe obtained.
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Yang et al-2020-Hole Locations and a Filling Method for Coprime Planar Arrays for DOA Estimation.pdf (2 Mo)
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