【摘 要】
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Thereal-time orbit determination for Low Earth Orbiters (LEOs) is generally based on dual-frequency tracking data from on-board GPS receivers,and positioning accuracies for LEOs currently vary from 0.
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Thereal-time orbit determination for Low Earth Orbiters (LEOs) is generally based on dual-frequency tracking data from on-board GPS receivers,and positioning accuracies for LEOs currently vary from 0.5 to 1.0m with sophisticated reduced dynamic orbit determination techniques.In this paper,different strategies are designed and applied to real-time orbit determination only using single-frequency pseudo-range and carrier phase measurements to analyze their corresponding performances.Then some simulative tests are carried out to process the GRACE-A space-borne GPS data in the different solar sunspot activities.The test results demonstrate that the position and velocity accuracy (3DRMS) are up to 0.9m and 0.9mm/s respectively using only single-frequency GPS pseudo-range data,and their accuracies could be improved to 0.55m and 0.55mm/s using single-frequency combination of pseudo-range and carrier phase measurements,which is close to the dual-frequency real-time orbit determination.Therefore a low-cost single frequency space-borne GPS receiver can be used in real-time orbit determination for LEO missions when appropriate strategies and methods would be selected.
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