Reactance-domain MUSIC DOA estimation using calibrated equivalent weight matrix of ESPAR antenna

This paper present a calibration method of the equivalent weight matrix for the reactance-domain MUSIC algorithm of the ESPAR antenna. This is a way of calibrating an ESPAR antenna by employing a signal eigenvector corresponding to a signal eigenvalue. We adopt seven directional patterns including an omni pattern to obtain a correlation matrix In experiments, we can find that the proposed calibration method provides a higher spectrum peak of about 20 dB and an accurate estimation angle. We conclude that accurate DOA estimation depends on sets of varactors forming several directional patterns.