Combination of Beidou and GPS observations to establish regional Ionospheric map

Abstract

This paper uses dual-model observations of the 118 stations from October 11^th to November 27^th, 2016 to establish the quasi real time Beidou Regional Ionospheric Map (RIMC), GPS Regional Ionospheric Map (RIMG) and the combined Regional Ionospheric Map (RIMM). The precise weights of each Beidou and GPS observations are determined by using the Helmert variance component estimation method. Then the DCBs of GPS satellites are compared with that published by CODE. The grid points of the areas where the IPPs covers are selected to further analyze the accuracy of the RIMM by comparing with the RIMC, RIMG and CODE GIM of DoY 287-332, 2016. The experimental results show that the accuracy of the RIMM improves about 0.3 TECU after adding the GPS observations.