High-accuracy baseline estimation using differential NavIC and GPS

Abstract

The estimation accuracy of a short baseline with NavIC L5 and S1 and GPS L1 differential pseudoranges from the primary service area is presented. The mean of the single-difference (SD) NavIC L5 and S1 pseudorange errors differ by 45 cm. Using single-epoch least squares, the baseline estimated using an elevation mapping function with the SD pseudoranges for NavIC L5 has an accuracy (2-sigma) of 0.78 m (east) and 1.6 m (north) compared to the GPS L1 accuracy (2-sigma) of 0.77 m (east) and 1.42 m. With recursive least squares, the accuracy of the baseline with NavIC L5 is 0.26 m (east) and 0.24 m (north). The baseline estimated with NavIC S1 pseudorange is less accurate by a factor of 1.5 compared to NavIC L5. The baseline estimation error statistics with NavIC double-difference pseudoranges using single-epoch least squares are same as the error statistics with SD NavIC pseudoranges. © 2020 ION 2020 International Technical Meeting Proceedings. All rights reserved.