Trop-NET processing strategy

Network clustering, use of NEQ stacking in spatial and temporal domains

Several aspects need to be particularly considered for near real-time (NRT) GNSS troposhere monitoring:

• High efficiency of low-latency GNSS processing.
• Long-term receiver coordinate stability and their consistency with actual troposphere estimate.
• System robustness with minimum manual interventions.

The Trop-NET system uses various strategies to support above features. The system uses as much as short data batches in order to minimize the processing redundancy, however, still providing a highly robust solution. The robustness is also supported for estimating consistently and efficiently coordinates and tropospheric parameters within a single process. The following features are characteristics for the Trop-NET:

• 4-hour data processing window (1-2 hours were used effectively in the period of 1999-2009)
• adaptable network clustering
• dynamic parallelization of all procsesing steps
• all parameters estimated using optimal stacking of previous solutions (NEQs) in temporal and spatial domains
• many integrated control points supporting elimination of various problems
• flexible configuration and input orbit product utilization
• self-supporting strategy based on raw GNSS data and precise global products only
• self-initalization and automatic update of site coordinats
• tropospheric product filtering