Galileo (satellite navigation)

Galileo is a global navigation satellite system (GNSS) that went live in 2016, created by the European Union through the European Space Agency (ESA), operated by the European Union Agency for the Space Programme (EUSPA), headquartered in Prague, Czechia, with two ground operations centres in Fucino, Italy, and Oberpfaffenhofen, Germany. The €10 billion project is named after the Italian astronomer Galileo Galilei. One of the aims of Galileo is to provide an independent high-precision positioning system so European political and military authorities do not have to rely on the US GPS, or the Russian GLONASS systems, which could be disabled or degraded by their operators at any time. The use of basic (lower-precision) Galileo services is free and open to everyone. A fully encrypted higher-precision service is available for free to government-authorized users. Galileo is intended to provide horizontal and vertical position measurements within 1 m precision. Galileo is also to provide a new

A Galileo E1b,c RF Front-End Optimized for Narrowband Interferers Mitigation

Cyril Botteron, Frédéric Chastellain, Pierre-André Farine, Davide Manetti, Giuseppe Zamuner

The current Search and Rescue (SAR) service, which is based on the Cospas-Sarsat system, suffers from major limitations such as poor position accuracy, long alert times and high false alarm rate. Two types of distress signals are used, the first 121.5MHz/(up to 100mW) and the second 406MHz/5W, the latter being able to carry digitally encoded identification and position data. The Galileo system will importantly contribute to the improvement of the SAR system. Indeed, the Galileo satellites will include a transponder in order to re-broadcast the 406MHz message, which will allow a better coverage (27 Galileo satellites plus the current seven Cospas-Sarsat satellites) and also a shorter alert time. They will also include a return link message (RLM) in the Galileo E1b open service signal, which will reduce the number of false alarms. The Galileo system is therefore a great opportunity for the development of a new generation of beacons which will include a Galileo receiver and therefore be able to take advantage of the better coverage provided by the Galileo constellation to provide shorter alert times and of the RLM to reduce the number of false alarms. One of the major issue when designing a Galileo receiver to be operated in a distess beacon is to design a front-end that is sensitive enough to pick the very weak Galileo signals and on the same time rejects the strong distress messages. Indeed, when the beacon is turned on, the Galileo receiver is in cold start conditions and a short amount of time is left to the receiver to get a first fix before any distress message is actually emitted. However, in some cases, the receiver is not able to determine its position sufficiently fast and the front-end therefore has to acquire the satellites in the presence of the distress signals. This paper presents a Galileo radio frequency front-end designed in order to operate in the presence of such signals.

2006

A flexible Galileo E1 Receiver Platform for the Validation of Low Power and Rapid Acquisition Schemes

Marcel Baracchi Frei, Cyril Botteron, Frédéric Chastellain, Pierre-André Farine, Davide Manetti, Giuseppe Zamuner

With the inclusion of 406 MHz transponders on the Galileo satellites and the new search and rescue (SAR) return link message (RLM) on the open service E1B signal, the availability of distress beacons equipped with a Galileo or combined GPS/Galileo receiver will be very important in the future to take advantage of the SAR RLM, thereby facilitating the rescue operations and helping to identify and reject false alerts. Consequently, this paper provides the status of the development of a flexible Galileo L1 receiver platform as well as an analysis and comparison of acquisition schemes suitable to be implemented in 406 MHz Cospas-Sarsat distress beacons. For each considered acquisition scheme, we compare the acquisition performance that can be obtained using GPS L1 C/A or Galileo E1B or E1C signals and consider and discuss the following main constraints: a very short time to first fix (TTFF) in cold start conditions (the beacon’s GNSS receiver may not be powered on for years before it is activated in an emergency); a low energy consumption per position fix (the beacon and GNSS receiver are battery powered); a possibly long coherent integration time to achieve synchronization and tracking in harsh environments (e.g., when some or all of the satellite signals are blocked or attenuated by an obstruction); the ability to demodulate the satellites signals in the presence of a 406MHz/5W and a 121.5MHz/(up to 100mW) beacon transmitters; and a low complexity (low price).

2006

A Galileo E1b,c RF Front-End Optimized for Narrowband Interferers Mitigation

Cyril Botteron, Frédéric Chastellain, Pierre-André Farine, Davide Manetti, Giuseppe Zamuner

2006

Galileo (satellite navigation)

Advanced Tracking Algorithm Designs for New Galileo Signals and Security Protection and Mitigation

A Galileo E1b,c RF Front-End Optimized for Narrowband Interferers Mitigation

A flexible Galileo E1 Receiver Platform for the Validation of Low Power and Rapid Acquisition Schemes

A Galileo E1b,c RF Front-End Optimized for Narrowband Interferers Mitigation

A flexible Galileo E1 Receiver Platform for the Validation of Low Power and Rapid Acquisition Schemes

Advanced Tracking Algorithm Designs for New Galileo Signals and Security Protection and Mitigation