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Hollow Corner Cube Retro-Reflectors In-Orbit PNT

Optical solid Corner Cube Retro-reflector (CCR) arrays are often implemented to allow laser tracking of satellites from ground. In order to achieve a measurable return signal, such arrays are typically rather large, and as conventional corner cubes are made of glass, the arrays are typically high in mass. However, in recent years, interest has grown in using hollow corner cubes for space…

New Concept for Evolutive Mitigation of RFI to GNSS

Radio frequency interference, intentional or not, is considered to be among the main threats to safety-critical and commercial GNSS applications. This includes out-ofband emissions, privacy-protection devices (PPD) also known as in-car jammers, etc. Consequently, many COTS GNSS receivers nowadays integrate mitigation strategies for RF interferences (jamming and spoofing). Moreover, one can note…

Proof of concept of hybrid 5G-NR/GNSS Positioning with ad-hoc overlay

GNSS has become the corner stone of worldwide positioning applications, and in particular for those requiring high-accuracy. The outstanding performances in open sky and very competitive performances in degraded environments of GNSS are widely acknowledged, but also the need to complement GNSS by other technologies to address specific needs in challenging environments. In this context, 5G…

Cooperative Positioning and Integrity Concept in Vehicle Platooning

Vehicle platooning is a scenario in which vehicles automatically follow each other in a sequential formation known as the platoon. Autonomous Vehicle Platooning is a promising feature that could be provided by future self-driving cars, trucks and other vehicles. It involves a human driver that is either physically present or is remotely controlling the vehicle at the platoon lead. Autonomous…

An Innovative concept for the Risk Assessment of Geologic Hazards using GNSS and Solid Earth Tides Modelling

It is long debated whether a relation exists between the tidal stress produced by the Moon and the Sun on the Earth crust and the occurrence of difference geologic events, in particular large earthquakes and volcanic eruptions. Clear evidence for this relation has been elusive for a long time. However, the analysis of more complete global earthquake catalogues has shown that a significant…

Combining ELF signals with GNSS for improved PNT

The need for a robust PNT to complement or back up GNSS in critical infrastructure/critical application is widely acknowledged. This translates into actions taken by stakeholders to further raise awareness (e.g. radio navigation plans in the US and Europe) and for some, pave the way towards some deployment (e.g. recent Request for Information initiated by the US Department of Transport for a…

Multi-layer PNT for SAR

Satellite Search and Rescue (SAR) standards are set and overseen by COSPASSARSAT. SAR instruments are currently flying on board MEO satellites in several GNSS constellations. These platforms complement the existing LEOSAR and GEOSAR satellites. Existing LEO/GEOSAR are slow in detecting an active beacon due to several limitations in design (limited satellites, fast orbits, no independent location…

Interference Monitoring from Space

A great number of civilian and military applications relies on GNSS for PNT, however its availability could be put at risk by threats such as local interference, amongst others.  GNSS spectrum monitoring is essential for: detecting, characterising and localising interference sources, which could endanger the adequate reception and processing of GNSS signals;  initiating a justified…

Next Generation Motion Sensors for Hybrid GNSS INS Solutions in high accuracy machine control applications

Robotics, machine control, industry automation require high accuracy positioning, as well as very robust PNT to support autonomous operations. Relative motion sensors (e.g. IMU) are key to complement GNSS in case of outage or for enhanced robustness and sustained high accuracy. In open sky, the state-of-the-art of GNSS and IMU provide good performance. However, cost-efficient IMUs still face…

Quantum Metrology for secure PNT

Quantum metrology techniques show great potential to enhance both precision and security of existing PNT techniques. It has been shown that, by probing physical quantities using quantum states of light and/or matter, one can achieve a precision beyond the theoretical limit set by classical mechanics. This effect has been demonstrated in a variety of contexts and is particularly useful in optical…