Academy of Mathematics and Systems Science, CAS
Colloquia & Seminars

Speaker:	Zixiang Yang, Beijing Institute of Technology
Inviter:	Doctor Xu Zhang
Title:	Fractal Sparse Array Based on High-Order Difference Co-Array
Language:	Chinese
Time & Venue:	2023.07.21 09:30-10:20 N226
Abstract:	Array signal processing plays an important role in the fields of radar, sonar, communications and radio astronomy, where array geometry design is one of the core issues. Sparse linear arrays with non-uniform inter-element spacings have the ability to resolve more uncorrelated sources than the number of physical sensors in direction of arrival (DOA) estimation. Sparse arrays based on the high-order difference co-array concept provide a large number of degrees of freedom, but are typically difficult to design under multiple optimality criteria. In this talk, we will discuss a joint across-order and inner-order fractal framework to form a fractal array based on the 2qth-order difference co-array (2qth-O-Fractal) by recursively using a simple generator. We will show that multiple properties of interest, including large consecutive difference co-array, closed-form sensor positions, hole-free difference co-array, robustness to sensor failures, and resilience to mutual coupling, are inherited from the generator under appropriate conditions. Simulation results verify the superiority of the proposed framework in terms of estimation accuracy and resolution capability.