Self-supervised Calibration Method of Array Antenna for High-Precision GNSS Application

GNSS array antenna have been widely used for single-tone, narrow-band, wide-band interference mitigation in satellite navigation application, however, this induces biases to code phase and carrier phase measurement, which will restrict its usage in high-precision application. Biases could be compensated based on calibration of array pattern in Microwave Anechoic Chamber, which is complicated and could not handle platform influence. Towards this issue, this paper proposed a self-supervised calibration method of array antenna phase center for high-precision GNSS application cooperated with inertial technology. Firstly, high-precision GNSS receiver is designed for amplitude and carrier phase measurement of multi-antennas simultaneously. Secondly, we use a single axis servo turntable to speed up the calibration process by rotation scheme optimization, satellite direction vectors are projected to array coordinate system based on platform attitude measured by an inertial north finder. Finally, data smoothing and local interpolation are utilized for measurement pattern fitting. Open-sky test is carried out, thus validating the effectiveness of this method.