Direction of Arrival Estimation Based on Improved Measurement Matrix for Uniform Circle Array

In this paper, the orthogonal matching pursuit algorithm is combined with long-short baselines theory used in the correlation interferometry. The guiding baselines of different lengths come from each two antenna array elements so that the advantages of every baseline can be fully utilized to achieve a higher-accuracy, higher-resolution direction of arrival measurement. Multiple simulations are presented to verify the efficiency of the method. From the simulation results, the angular accuracy can be improved to less than 1° in a wide frequency band, and the resolution can be improved from more than 20° to more than 10°.