Optimization and Hole Interpolation of 2-D Sparse Arrays for Accurate Direction-of-Arrival Estimation

This paper presents a method to optimize 2-D sparse array configurations along with technique interpolate holes accurately estimate the direction of arrival (DOA). Conventional arrays are often defined using closed-form representation and have property that they can create hole-free difference co-arrays DOAs incident signals outnumber physical elements. However, this restricts configuration limited structure results in significant mutual coupling effect between consecutive sensors. In paper, we introduce an optimization-based for designing enhances flexibility as well DOA estimation accuracy. We also propose by nuclear norm minimization (NNM) permits extend aperture further enhance The performance proposed optimum is evaluated through numerical examples.