U-blox investigates interaction between LEO signals and GNSS

(CONNECT) U-blox is investigating the role of LEO signals in multi-layer positioning architectures as part of the Navigation Innovation and Support Program (NAVISP), Element 2 (EL2). According to a statement from the provider of positioning and short-range communication technologies for the automotive, industrial and consumer goods markets, the program is co-financed by the European SpaceAgency (ESA).

As part of the project, u-blox is investigating the observation and characterization of new LEO signals, the analysis of their interaction with GNSS measurement data and the effects of dynamic satellite geometry on positioning accuracy. In addition, various system approaches for integrating LEO signals into future platforms are being analyzed, including with regard to integration into the X20 GNSS platform.

The background to the project is the increasing importance of LEO-based signals as a supplement to established GNSS systems such as Galileo. Due to their lower orbital altitude, LEO satellites offer stronger signals and a rapidly changing satellite geometry. These properties can improve the performance of positioning systems, particularly in terms of convergence speed, robustness and accuracy under difficult reception conditions. GNSS remains the basis for global positioning.

The launch of the first two LEO satellites of the Celeste mission (IOD-1 and IOD-2) by ESA on March 28, 2026 represents an important step. This was the first step towards integrating navigation signals from low earth orbits into operational positioning systems.

"Our work within ESA NAVISP helps us to better understand how new signal sources can complement GNSS and contribute to more robust and reliable positioning," said Jani Käppi, Head of Positioning Technology at u-blox. ce/ja