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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…
Emits link: http://emits.sso.esa.int/emits/owa/emits.main
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…
Emits link: http://emits.sso.esa.int/emits/owa/emits.main
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…
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…
Emits link: http://emits.sso.esa.int/emits/owa/emits.main
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…
Emits link: http://emits.sso.esa.int/emits/owa/emits.main
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…
Emits link: http://emits.sso.esa.int/emits/owa/emits.main
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…
Emits link: https://emits.sso.esa.int/emits/owa/emits.mainl
