Raw data analysis

The GNSS Receiver module uses a raw data analysis to preprocess the observations for each satellite. It detects errors, such as unhealthy satellites, data drifts, outliers or cycle-slips.

• If a cycle slip has been detected, the module tries to correct it to provide consistent observations. Data, which can not be corrected, is removed from the data set, before it is passed on to other modules.
• Multipath effects are estimated (receiver noise models are respected) for L1 data separated by code and carrier (phase). It is displayed as multipath plot.
• In combination with the antenna phase correction table the raw data analysis uses the best available orbits to calculate elevation dependent and azimuth dependent antenna phase offsets.
• Ionospheric scintillation effects are calculated per satellite and sent to the Ionosphere Analysis module once every 30 seconds. They are displayed as integer index numbers between 0 (no scintillation effect) and 10 (highest ionospheric scintillation value) in the GNSS Receiver- Raw Data Analysis view. If filtering for ionospheric scintillation is enabled in the Device Manager for all depending GNSS Receiver modules, data influenced by high scintillation effects will be removed from the datasets. The threshold for scintillation effects to be considered high depends on the value set for the Device Manager property Ionospheric scintillation filter.

Note - The raw data analysis respects a minimum cutoff elevation angle of 5°, even if the respective receiver setting is set to a lower value.