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089 - Modelling Quantum Sensors in a realistic navigation system context
As well as the potential next generation quantum time and frequency sources, the world of quantum systems contemplates evolutions of gyroscopes, accelerometers, gravitational sensors and magnetometers based on quantum effects. Predictions of the performance of these new quantum sensors offer the prospect of accurate navigation without GNSS for long periods of time with some predicting that GNSS…
088 - Proof-of-concept of advanced navigation algorithms based on factor graph optimization
Factor graph optimization is gaining attention from the community (it has won the Google challenge) as is outperforming traditional positioning algorithms. Factor graph optimization may be used to replace the traditional Weighted Least Square (WLS) or Kalman Filter (KF)-based solutions, both in stand-alone and hybrid positioning solutions in combination with sensors. Thus, its application may be…
087 - Verifiable AI/ML techniques for PNT applications
Artificial intelligence (AI) is increasingly utilized in the PNT field, enhancing the performance and reliability of Global Navigation Satellite Systems (GNSS), from RF interference detection and mitigation to sensor fusion. The advancement and ever-increasing size of neural networks increase the complexity of applications supported by AI, and with the increasing complexity, verifiability…
086 - Instantaneous High-Accuracy Positioning based on Hybrid-Meta-Signal Solutions
Meta-signal processing has raised interest in order to enable the achievement of high accuracy solutions based on the joint exploitation of two or more signal components as a single composite signal. The drawback of this approach is the appearance of multiple correlation peaks, inducing potential biases in the meta-signal pseudoranges when operating in harsh environments. On the other hand,…
084 - Digital Beamforming for GNSS-R Radio occultation payload
GNSS Radio Occultation is a well-established technique while the younger GNSS Reflectometry has seen a rapid evolution around the world, in particular, after the launch UK-DMC satellite in 2003
Some examples of GNSS-R missions flying today are: the NASA’s CyGNSS 8-satellite constellation, the Spire Global cubesat constellation, the FSSCat cubesat, the Chinese Bufeng 1 Twin Satellites and…
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…
080 - Miniaturised GNSS/LowRF receiver
GNSSs are typically operating from MEO, using spread spectrum techniques and having a large coverage by each satellite, therefore the user receiver signal power received on ground is extremely low, ‘buried’ under the thermal noise level.
Because of that, the GNSSs susceptibility to RFI interference, both generated locally with inexpensive means like Personal Privacy Devices or more…
079 - Reduced size Antenna for Earth Pulsar navigation
Pulsar are rapidly rotating neutron stars emitting beams of radiation periodically, some with very high stability.
Since every pulsar has a different frequency, they can be used in a navigation system like beacons, and in timing (see EL1-006).
Emission occurs in all spectrum (infrared, visible, RF, X-ray). For space navigation, detectors in X-ray are preferred for their size, but detectors…
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…