S-system theory applied to array-based GNSS ionospheric sensing

GNSS Array-Based Ionospheric Spatial Gradient Monitoring: Precision and Integrity Analyses

Integrity monitoring and reliable detection of the ionospheric spatial gradient is of importance for various fields including total electron content modeling, radio communication and radar, and differential GNSS applications such as landing, departure and surface operations at an airport. In this contribution, we investigate the precision and the integrity of the ionospheric spatial gradient es...

AATR an ionospheric activity indicator specifically based on GNSS measurements

This is anOp Abstract – This work reviews an ionospheric activity indicator useful for identifying disturbed periods affecting the performance ofGlobal Navigation Satellite System (GNSS). This index is based in the AlongArc TEC Rate (AATR) and can be easily computed from dual-frequency GNSS measurements. The AATR indicator has been assessed over more than one Solar Cycle (2002–2017) involving a...

Ionospheric Sounding and Tomography by GNSS

Studies of the ionosphere and the physics of the ionospheric processes rely on the knowledge of spatial distribution of the ionospheric plasma. Being the propagation medium for radio waves, the ionosphere significantly affects the performance of various navigation, location, and communication systems. Therefore, investigation into the structure of the ionosphere is of interest for many practica...

The Concept of the TRANSMIT Prototype –Network Based Service for Mitigation of Ionospheric Threats to GNSS

GNSS remote sensing

Editorial Global Navigation Satellite System (GNSS) remote sensing comprises GNSS reflectometry (GNSS-R) and GNSS refractometry (also known as GNSS radio occultation or GNSS-RO). GNSS-R involves analyzing measurements of GNSS signals reflected from the Earth's surface, while GNSS-RO utilizes measurements of GNSS signals refracted by the atmosphere, when the slanted propagation path is close to ...