Honing our IONO+ algorithms
The green curve shows positioning effected by scintillation, while the blue curve shows positioning on a receiver with built-in iono-resilience.
As a direct result of involvement in various projects in Brazil, a country typically plagued by scintillation, Septentrio has developed IONO+ technology. Equipped with IONO+, Septentrio receivers can continue to track signals in conditions that would degrade standard receivers. It also enables Septentrio receivers to recognise scintillation events and limit any adverse effect they might have on position accuracy. The plot above shows the height calculated by a static receiver during a scintillation event: the IONO+ algorithms correctly identify and remove signals affected by scintillation from the position calculation.
The purpose of IONO+ technology is to mitigate adverse impact of both normally active and scintillating ionosphere. With standard RTK positioning a network of reference stations is typically required to interpolate ionosphere delays and compensate for them at the rover. With IONO+, ionosphere delays are estimated internally, and no network is needed. A single reference station with a baseline up to 40 km is sufficient, and even up 80 km, if ionosphere is quiet.
For more details and examples see our technical paper: CALIBRA: Mitigating the impact of ionospheric scintillation on Precise Point Positioning in Brazil.