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Complementary PNT Infrastructure in LEO

GNSS is the only global, free, comprehensive technology providing absolute PNT data to users worldwide. Its limitations are known, including long life cycle and replenishment schedule, affecting their ability to adapt easily to short term market needs and to some extent, resilience. Considering the above, alternative PNT methods and solutions have been developed, innovative PNT systems are…

System Suitability Study for Train Positioning Using GNSS in ERTMS in 2020

The objective of this activity is to study the suitability of the current generation of SBAS for use in an evolution of the European Rail Traffic Management System (ERTMS) using GNSS for virtual balise detection. This activity focuses on the current generation of the European SBAS, EGNOS v2 (GPS L1 only) and includes the following aspects: Review and consolidate requirements and…

High-Altitude Pseudo-Satellites for PNT

High-Altitude Pseudo-Satellites (HAPS) are airships “quasi-”stationed at a height of 20-30 km, in an altitude range where atmospheric winds are milder. HAPS are normally solar powered, unmanned, large, helium filled and semi-rigid; they can be operational for several years.  HAPS have been studied in the telecom domain (ESA GSP HAPPIEST study), where they were briefly considered…

Trusted Radionavigation via Two-Way Ranging

Wireless positioning systems based on passive ranging, as used in GNSS today, are very attractive and represent the most pragmatic and cost-beneficial solution for worldwide positioning in benign, secured environments; however, this may no longer be a one-size-fits-all solution for modern radionavigation usage as the need for complementary solutions offering adaptability, reliability and trust is…

Quantum-based sensing for PNT

The exploitation of quantum physics has already enabled revolutionary technical applications and industries of enormous economic scale. The semiconductor industry alone is currently a €500 billion market, giving rise to industries on an even larger scale (smartphones, computing, software, etc.).  Quantum physics is now again set to radically change several industries, including…

PNT using Neutrino Particles

This proposed activity represents an innovative concept to realise Positioning, Navigation and Timing using neutrino particles. At present, standard navigation approaches – including satellite navigation – rely on direct line-of-sight RF and optical communications. Neutrinos move at around the speed of light, have no electric charge and are low mass, thus showing very low interaction with…

Feasibility study of a space-based relativistic PNT system

All GNSS in operation at present are based on Newtonian physics and rely on global reference frames fixed to Earth. Relativistic effects are treated as deviations that need to be corrected for. Precision and stability over time of the reference frames is provided via ground stations and they are limited by the Earth’s dynamics (e.g. variations of the Earth’s rotation rate, plate tectonics,…

GNSS/non-GNSS Sensor Fusion for Resilience in High Integrity Aviation Applications

GNSS technology has demonstrated its capability to provide very good performance in Europe up to LPV 200 based on GPS L1 (single frequency, single constellation) and is expected to reach CAT I Autoland with the future DFMC mode (Dual Frequency, Multi Constellations – GPS & GAL). It is very challenging to improve this performance, more specifically the 6-second Time To Alert (TTA) that seems…

Techniques supporting Resilience for High Integrity Train Control Applications

The objective of the proposed activity is to study GNSS carrier phase integrity techniques for application in railway safety of life applications, and in particular, the evolution of the European Rail Traffic Management System (ERTMS) with virtual balise detection using GNSS.  Carrier phase positioning can achieve a significantly better performance than code-based positioning; however, to date…