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Advanced Multi-Frequency Low-Cost High-Gain GNSS Antennas for next generation of Mass-Market Devices

Mass-market GNSS receivers, mostly installed in smartphones, use low cost antennas that need to be compatible with the communication antennas of these terminals. Typical antennas used in mobile phones are simple PIFAs (Planar Inverted-F Antennas) suitable for any constellation in L1 band, such as GPS/Galileo, GLONASS/Beidou. Their linear polarization (instead of circular) and low gain lead to…

Collaborative Processing of Distributed Receivers of Opportunity for Jamming and Spoofing Mitigation

The fast evolution of the Internet of Things (IoT), commercial Cloud platforms, and the future 5G standards are boosting development of new applications and technologies in the PNT field. Devices are expected to be increasingly connected to Internet in the next few years, storage and processing of data in the Cloud is already a reality, with 5G expected to bring very soon higher data rates and…

Precise positioning for mass-market: optimal data dissemination demonstrator

Until recently, RTK and PPP technologies have been developed for professional applications, the price not being affordable for mass-market users. Over the last couple of years, however, impressive breakthroughs have been witnessed for mass-market applications. While multi-band GNSS will provide an improved user experience in many consumer settings, the solution alone cannot deliver sufficiently…

GNSS Science with Commercial Aircraft

Usage of commercial aircraft and vessels, as platforms for crowdsourcing science and remote sensing, is under study by organisations like the International Hydrographic Organization (IHO) in its Crowdsourced Bathymetry Working Group, or by private companies for imaging and radar applications. Some advanced passive GNSS-based processing techniques (e.g. exploiting simultaneously direct and…

Alternative Space-based PNT Data Layer

In the last years, there has been fast progress in satellite on-board computing achieved by the satellite telecommunication industry. On-board processors are more performant, with less mass, volume and power consumption. As regards current and evolving space-based PNT data layer services (e.g. private or public GNSS data augmentations), they usually retransmit data computed on-ground via…

Multi-Sensor, Multi-System for Space PNT Applications

Position uncertainty during autonomous manoeuvres such as orbit-raising/de-orbiting requires that the local knowledge during low thrust (i.e. with electric propulsion) is accurately determined. Current orbit-raising assumes semi-autonomous control assisted by GNSS, with a long time integral to measure increasing altitude and trajectory of the satellite. The use of a hybrid GNSS unit that…

Earth-Moon Navigation / System Study and Development of a Highly-Sensitive Spaceborne Receiver Prototype

GPS has been used in space for more than 20 years and currently it is consistently used in LEO orbit satellites in order to provide position, velocity and time information. Extension of its use to higher altitude missions has been the subject of multiple studies, GEO and GTO orbits currently exploit GNSS signals and the NASA Magnetospheric Multiscale (MMS) mission has recently demonstrated that…

Ultra-Low Power Device Positioning Concepts

There are an increasing number of IoT applications, and projections show that global Low Power Wide Area (LPWA) connections will increase by almost one order of magnitude in the next five years. Terrestrial networks are continuously targeting evolutions of the IoT markets. For example, the latest release of 3GPP standards has introduced modifications to their standard (e.g. NB-IoT) to comply with…

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…

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,…