Full-Sphere Angle of Arrival Detection using CMRCLEAN

Extraneous signals propagating into the quiet zone (QZ) of an antenna measurement chamber pose a large contribution to the error of measurements therein. From the angle of arrival (AoA) of these extraneous signals, the locations of the reflective points, from which these signals originate, can be determined. If the location of a reflection point is known, it can be treated, and thus the level of the extraneous signal can be reduced or even completely mitigated. The combining mode rotation with CLEAN (CMRCLEAN) algorithm has shown that it is capable of detecting the AoA of closely spaced reflective sources, even in the presence of a strong signal such as the main beam illuminating the QZ. In this communication, the CMRCLEAN algorithm is further improved to allow a better discrimination of signals and their amplitude. Furthermore, this communication will show the ability of the improved algorithm to detect reflections from opposing directions, such as those originating from the back wall, which is opposite to the much stronger range illumination.