Abstract:The ionosphere range delay is one of the dominating error sources for the space-borne GPS single-frequency real-time orbit determination. When corrected by ionosphere correction models, the residual error has obvious influence on the accuracy of real-time orbit determination. In this paper, we use single-frequency pseudo-range and carrier phase measurements, calculated with two different ionosphere correction models, and then we analyze their impacts on the results. Our study shows that when the altitude of the low earth orbit (LEO) satellites is 500 km or higher, the position and velocity accuracy (3DRMS) are 0.86 m and 0.9 mm/s, which is close to the accuracy of dual-frequency pseudo-range real-time orbit determination. When using the group and phase ionosphere correction (GRAPHIC), the position and velocity accuracy can be 0.54 m and 0.55 mm/s. Therefore, when an appropriate ionosphere correction model is selected, low-cost single-frequency space-borne GPS receivers can be used in real-time orbit determination for micro-satellites.
WANG Fuhong,GUO Lei,SHAO Xiaodong et al. Effects Analysis of Two Ionosphere Correction Models on Space-Borne GPS Single-Frequency Real-Time Orbit Determination[J]. jgg, 2016, 36(7): 565-569.