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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…

Next Generation network-assisted PNT assurance

PNT assurance against malicious threats like spoofing relies on four main enablers: - authenticity of the information relating to the nodes used for computing the position (e.g. clock and ephemeris data of GNSS satellites). It can be built and distributed in a network-assisted configuration, for instance by monitoring the PNT system or accessing directly the original information; -…

Earth Moon GNSS Spaceborne Receiver for In-Orbit-Demonstration

Current GEO and GTO missions already exploit GNSS signals for in-orbit PNT. NASA’s MMS mission has recently demonstrated that tracking of GPS signals is possible up to 150,000 km from Earth surface (half-way the distance to the Moon).  The feasibility of extending the use of GNSS for missions to the Moon has also preliminarily been assessed by ESA via GSP. These preliminary studies have…

Application of Machine Learning Technology for GNSS IoT Data Fusion

Recent advances in technology have contributed to the deployment of a "de-facto" large GNSS receiver array based on affordable smart devices that are easy to find in the consumer market (dual band smartphones, raw GNSS data recording, new sensors).  These devices, evolving fast with each new generation, feature an increasing number of capabilities and sensors able to collect a variety of…

PNT Timing & Synchronisation for Aviation Systems and Networks

GNSS is extensively used in aviation, notably for: positioning and timing for on board navigation purposes; timing and synchronisation for datalink communications (board to ground and viceversa); timing and synchronisation on ground for Surveillance, Air Traffic Control (ATC) and communication networks. GNSS time outages or unexpected anomalies may affect aviation systems and…

Machine-Learning to model GNSS systems

GNSS simulations are an important toolset supporting system engineering trade-offs and decisions. They are used to display and monitor key system performance indicators as well as study system behaviour, both through synthetic scenarios and real data replay. Industry and ESA currently use different tools to simulate GNSS systems, however often constrained to undertake only one of two different…

AI-enabled baseband algorithms for High Fidelity Measurements

Critical applications such as autonomous vehicles and machine control require high fidelity raw measurements in challenging environments. In spite of significant progress made in recent years, for those applications GNSS performance remains unsatisfactory in terms of reliability in challenging environments, therefore requiring improvement. The main challenges lie in handling transfer functions…

Antenna and Transponder Unit for Underwater PNT

Underwater wireless communications links have almost exclusively been implemented using acoustic systems. Optical links have proved impractical for many applications. Although underwater radio links were experimented in the pioneering days of radio, they did not meet the requirements of the time. Given modern operational requirements and digital communications technology, the time is now ripe for…

Advanced concept for chip-scale atomic clocks

Interest in compact and low power consumption atomic clocks (aka CSAC, Chip-Scale Atomic Clocks) have been progressively increasing in the last decade based on benefits demonstrated for a wide range of application, such as PNT in adverse environment (long coherent integration), secure telecommunication (frequency hopping) or in order to allow timing hold-over capability in case of loss of GNSS…

Precise Timing for Indoor Small Cells

GNSS signals are widely used for time synchronization purposes in many different application sectors, including telecom, finance and energy. Telecom service providers, in particular, consider GNSS-based synchronization well adapted to macro-cells whereas alternative synchronization technologies (e.g. wire-based solutions like Precise Time Protocol) are deemed more suitable for indoor small cells,…