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083 - Deployable satellite navigation antenna
The flourishing of utilisation of small and nano satellites in LEO orbit, and the need for ever better navigation accuracy, suggests the study of (relatively) high gain deployable navigation receiver antennas, in new frequency bands, that can be stowed at launch.
In a small satellite, this antenna should allow to achieve better performance when deployed than equivalent non-deployable patch,…
082 - Low noise frequency tunable microwave generation using photonic integrated microcombs
Ground based optical free space communication experiments have enabled >1 Tb/second communication links based on the multitude of carriers that are individually modulated to carry information. Optical frequency combs with line spacings that match the ITU grid have potential to implement free space communications in space.
These advances utilize the unique features of microcombs: in contrast…
078 - Autonomous Alternative Absolute Navigation (AAAN) technologies for maritime
These days, GNSS is fundamental for navigating but it is still fragile: it can be spoofed or jammed.
Using a sextant to determine a star position relative to the horizon, sailors have marked ship locations for centuries using Celestial Navigation (CN). Nowadays technology would allow automatic adoption of this technique, extending its utilization to daylight and exploiting not only stars, but…
077 - Technological Enablers of Cellular Networks for PVT Assurance
Cellular networks have various built-in security features including access control, mutual authentication, and key management, which could be evolved to provide technological enablers for PVT assurance.
An efficient solution to protect from PVT spoofing is the use of symmetric cryptographic mechanisms to render the ranging signal unpredictable to the potential attacker.
The concept…
075 - Bearer Independent Secure Time Transfer
A common requirement for achieving an assured Position, Velocity and Time (PVT) service is to securely initialize the receiver with coarse time synchronization.
For additional security, this information can be provided periodically during the mission.
A space-based infrastructure is the most attractive option to achieve a global service coverage.
Relying on external network provider…
071 - Technologies for Reliable Ambiguity Resolution (RAR) and Integrity in High Accuracy Positioning
High Accuracy requires usage of phase measurements, which are ambiguous measurements: ambiguities must be fixed to relate phase measurements to ranges.
Phase Ambiguity Resolution is a stochastic process which needs a minimization search for the correct ambiguities which can require a very large search to find the correct solution: such a search is very time consuming and the search space must…
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