A STUDY ON TIME VARIATION OF POSITIONING SOLUTIONS AFTER REINITIALIZATION IN CLAS BY QZSS

Abstract

 In this study, in order to examine the use of centimeter-level positioning augmentation service (CLAS) by QZSS. in surveying, we verified positioning solutions after reinitialization when positioning at known points. We averaged the data from the CLAS fix solution acquisition start time to 180 seconds (epoch) over several time periods, and evaluated the difference from the known point coordinates of plane rectangular coordinates X, Y, and altitude H, and the RMS error. As a result of the experiment, the maximum difference in the X and Y coordinates of CLAS is approximately 75% and 67% within the permissible value of ±2 cm, and the maximum percentage of the difference in elevation H is within ±3 cm, which is the permissible value. It became 30%. For the RMS error, the 10 epoch average value is lower than the 1 epoch average value in the X and Y coordinates, but it increases at the 20 epoch average value and 30 epoch average value, and gradually decreases after the 60 epoch average value, and the 180 epoch average value became the minimum.