Analysis of GNSS signal measurement accuracy

Abstract

eceiver-related errors significantly influence the accuracy of GNSS signal measure ments. One of these errors pertains to the antenna phase center correction. Several antenna calibration techniques, such as robot calibration, can mitigate the impact of such errors. However, there is a possibility that calibration corrections may not completely eliminate the errors in the antenna phase center. To address this issue, calibrated antenna phase center corrections were investigated by measuring GNSS signal observations at four different stations, each tilted to various angles in specific directions, involving up to six baseline length formations. This experiment was dis tinct from previous studies, which only involved one baseline length between two different stations with antennas physically tilted towards each other. Observation data from the four different stations were retrieved and processed using GipsyX with the Precise Point Positioning (PPP) method, and Bernese with the single dif ference technique (DGNSS). Additionally, a laser tracker was utilized to measure the station positions and baseline lengths, providing more precise measurements. The phase residual error models were derived from L1, L2 and L3 frequency observations. The error models indicate that all three frequency observations are influenced by er rors corresponding to antenna phase center corrections, with an error of -0.8867 mm for L1, -1.5728 mm for L2, and -0.3901 mm for L3.