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Weak GNSS Signal Navigation on the Moon

The initial step of the analysis is represented by the definition of the GNSS capabilities and receiver requirements in the environment of interest. The service volume concept has been introduced to this aim, and recent studies pointed out the interest to define and include GNSS performance above the altitude of the constellation itself [1], [2]. It is well known that signals, even if primarily broadcast from GNSS sources in order to serve Earth surface and proximity (i.e. with a beam directed nadir), are available at a limited extent also above the constellation.

Austria

043-3

Joanneum Research
Space-based Femtosecond Laser Filamentation

This study aimed at developing the numerical framework to investigate whether the remote generation of laser filaments from orbital altitude was theoretically feasible and in this case to gain insights on the required initial laser parameters to remotely generate a filament.

France

13R02

ECOLE POLYTECHNIQUE
Weak GNSS Signal Navigation on the Moon

Global Navigation Satellite Systems (GNSS) are already used in space missions (e.g. GOCE, Swarm, Sentinel, and MetOp, among others), not only as a navigation sensor (either for autonomous orbit and attitude determination or for relative navigation) but also as a science instrument (e.g. for altimetry, global geodesy, Radio Occultation and GNSS Reflectometry applications). However, its use is usually limited to orbits or mission phases below the orbits of GNSS satellites, since GNSS satellite antennas transmit mainly in the Earth's direction.

Portugal

13-071

Deimos

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