Table 1 Comparison of two real-time precise orbit determination methods
From: A review of real-time multi-GNSS precise orbit determination based on the filter method
Items | Ultra-rapid orbit prediction | Real-time filtering POD |
|---|---|---|
Dynamic equation | Deterministic force model for entire update orbit arc | Introducing random characteristics of force model between epochs |
Orbit state update | Constant parameters with entire update orbit arc | Stochastic parameters in a process |
Data quality control | Preprocessing and posteriori residual editing | Preprocessing and real-time quality control |
Ambiguity resolution | Post-processed resolution | Real-time resolution |
Orbit maneuver process | Fault orbit and long time unavailability | Real-time detection and handling to shorten unavailable time |
Real-time orbit product | Jumps in the update orbit arc boundaries | Smooth and continuous in long arc |