Point target angular resolution in near field for Ka-band interferometric synthetic aperture radiometer with sub-Y-type array configuration

This article evaluates the performance of interferometric synthetic aperture radiometer using sub-Y-type array proposed by our research group, SSL at GIST, Korea. The proposed array type has an improved resolution than the conventional Y-type known as optimal array configuration in the design of 2-D interferometric radiometer. To evaluate it, the interferometric synthetic aperture radiometer with 40 antenna array is developed at 37 GHz and two target noise sources were used for performance test. Through the experiments, the performance evaluation shows 23% improvement of angular resolution than the conventional Y-type