Abstract
Since most studies for estimating an angle-of-arrival (AOA) based on the antenna array have considered the antenna array with a single configuration, they are not proper to simultaneously estimate AOAs of multiple signals with various frequencies. In order to enhance this problem, in this paper, we propose a cascade AOA estimation technique based on a Combined Array Antenna (CAA) with Uniform Rectangular Frame Array (URFA) and Uniform Circular Array (UCA). It consists of Capon for roughly finding AOA groups including multiple signal AOAs, followed by Beamspace Multiple Signal Classification (MUSIC) for detailedly estimating signal AOAs in the calculated AOA groups. The proposed algorithm does not only have low computational complexity compared to the conventional AOA estimation technique like MUSIC, but also it has both characteristics of URFA and UCA.
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