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France’s Air and Space Academy recognises EGNOS for its significant contribution to European space.

The European Geostationary Navigation Overlay Service (EGNOS) was recently recognised by France’s Air and Space Academy (AAE). In honour of its significant scientific and technical contribution to European space, EGNOS was awarded the AAE’s Vermeil Medal during its 25 November 2016 plenary session in Toulouse. The medal is awarded annually to an individual or organisation that has achieved international notoriety in the field of aerospace. 

“I’m pleased to share this distinction with the EGNOS team and the entire GSA, which has dedicated many years to the success of this programme,” says GSA EGNOS Exploitation Programme Manager Jean-Marc Piéplu. “Many of my colleagues have personally contributed to the development of EGNOS, and this medal belongs to all of them.” 

Also read: EGNOS lays the foundation for Galileo

Joining Jean-Marc in receiving the award was European Space Agency (ESA) Head of EGNOS and SBAS Division Didier Flament and ENAIRE (Spain’s air navigation management organisation) Head of International Affairs and SESAR Coordinator Mariluz de Mateo.    

EGNOS also played a role in this year’s Great Prize winner, which went to the EGNOS-equipped Airbus A350-XWB.

About the AAE

Founded in 1983 in Toulouse, the AAE encourages the development of high quality scientific, technical, cultural and human actions in both air and space. To do so, it promotes knowledge sharing across the industry and serves as a focal point for aerospace activities. Its members – who come from all walks of aerospace life and include pilots, astronauts, scientists, engineers, doctors, manufactures, economists, lawyers and artists from France and Europe – work together to achieve these essential goals.

Media note: This feature can be republished without charge provided the European GNSS Agency (GSA) is acknowledged as the source at the top or the bottom of the story. You must request permission before you use any of the photographs on the site. If you republish, we would be grateful if you could link back to the GSA website (http://www.gsa.europa.eu).

The ability to access raw GNSS measurements opens up a range of opportunities for mobile app developers, but how do you access the data? During the first European GNSS Agency (GSA) Galileo Hackathon at the WhereCamp ‘unconference’ in Berlin Dr Lukasz Bonenberg from the University of Nottingham explained how app-developers can access raw GNSS measurements on smartphones via the latest release of the Android operating system.

The technical briefing for app-developers at the first GSA Hackathon at Beuth Hochschule für Technik in Berlin covered the latest developments and opportunities for GNSS and Location Based Services (LBS) including both hardware and software.

The hardware that the hackers used in the Hackathon - the Galileo-enabled BQ Aquaris X5 Plus Android smartphone - was described by Alvaro Fructuoso and Olaja Segura from the phone’s manufacturer. At the heart of the phone is the Qualcomm Snapdragon 652 chip that provides a true multi-constellation GNSS experience.

Digging down in Nougat

The next generation of Android operating system (7.0) is named Nougat and allows access to GNSS raw measurements using a new version of Google’s application programme interfaces (APIs) that give more flexible and deeper access to positioning data. Dr Lukasz Bonenberg from the University of Nottingham opened up the ‘black box’ that is the modern smartphone and shed some light on where hackers and coders needed to look to get access to this data.

Currently, location in Android is accessed via Google Play Services GMS Location providing activity and location awareness that can be easily harnessed by coders to provide enhanced location data (e.g. geofencing, near services etc.) for their apps. New Android Nougat (API v24) adds extra capacities. It directly accesses sensor data via android.location. This data has previously been hidden away in physical drivers, but access now opens up possibilities for higher accuracy and deployment of algorithms currently restricted to more advanced GNSS receivers.

While access to the raw data becomes easier, its use is still a challenging task. The key to reading GNSS measurements is the synching of clocks between the phone and the GNSS satellites to give pseudoranges – effectively the distance from the phone to the satellite degraded by the clock errors. To get an accurate and reliable fix requires signals – and therefore calculated pseudoranges - from at least four GNSS satellites, explained Bonenberg.

MatLab codes

To support this Google has released the MatLlab code demonstrating both the data collection (GNSS data logger application) as well as calculation details for obtaining observations and calculating position. To further support the development community, Bonenberg is developing a version of the processing code in the Python programming language. It is available at his GitHub together with his edits to the original Google MatLab code.

“The ability to access raw data opens up a range of possibilities and opportunities,” claimed Bonenberg. These comprise the use of external corrections including existing differential-GNSS and augmentations services such as EGNOS for high precision. More opportunities come with advanced algorithms to reduce errors in urban areas by, for example, removing satellites that are blocked by buildings from the positioning calculation, and the ability to fuse GNSS data with data from other phone based sensors such as the Inertial Measurement Unit (IMU).

Work is also carried out using carrier phase measurements offering even better positional performance. Not only do these developments promise improved accuracy, availability and reliability or data fusion for mass market applications, but also the ability to use those devices in the domains currently reserved for much more expensive and dedicated GNSS receivers Bonenberg concluded.

“The ability to access GNSS raw data on Android devices opens up a range of possibilities and opportunities.”

More information:

WhereCamp
Android Developers: Location
Lukasz Bonenberg’s GitHub on Android GNSS

Media note: This feature can be republished without charge provided the European GNSS Agency (GSA) is acknowledged as the source at the top or the bottom of the story. You must request permission before you use any of the photographs on the site. If you republish, we would be grateful if you could link back to the GSA website (http://www.gsa.europa.eu).

Space Generation Advisory Council společně s Czech Space Network organizují Christmas Dinner 2016. Tento vánoční večírek se bude konat v sobotu 10. prosince od 18:00 v Praze. I když se obě organizace zaměřují na podporu mladých lidí, na večírek jsou zváni všichni zájemci o kosmonautiku. Registrace předem nutná.

With more signals and better accuracy, Galileo is an invaluable resource for mobile developers working on precise positioning applications. During the first Galileo Hackathon at the WhereCamp in Berlin, experts from the European Commission’s Joint Research Centre (JRC) shared how Galileo is boosting accuracy and making positioning applications more precise.

App-developers at the first GSA Hackathon in Berlin got a full technical briefing on the latest developments and opportunities for GNSS and Location Based Services (LBS) at Beuth Hochschule für Technik. The packed briefing session heard why the GSA wants the developer community to play with Galileo data, how it hopes to stimulate the community to use Galileo signals to enhance their applications and, therefore, bring the two closer together.

To give the users further insight on the various data outputs and capabilities of Galileo, and GNSS in general, Michele Bavaro of the European Commission’s Joint Research Centre (JRC) described his work in testing Galileo ready receiver hardware.

Testing hardware

Broadly, two main categories of GNSS receivers exist: professional precision receivers and mass-market (currently only single frequency) receivers. Professional receivers are used for applications requiring high-accuracy, typically at decimetre, centimetre and even millimetre level. The mass-market category includes the chipsets found in smartphones, tablets, sat-navs, trackers, cheap drones and wearable electronics.

Last year JRC was involved in the assessment of Galileo-compliance and also characterised the effects of interference for a total of seven precision receivers. More recently, JRC has worked closely with the GSA and assessed the availability and consistency of the Galileo observables on the BQ Aquaris X5 Plus smartphone.

“Galileo is different to the current GPS system,” Bavaro stated. “It has more signals and better accuracy: essentially I believe it is the future of navigation.” He showed the results of simulated and real world testing of combined GPS + Galileo signals in both static and mobile situations. All the receiver manufacturers had been extremely supportive during the testing.

Bavaro said that the residuals of the Galileo E1 signal were smaller than those of the equivalent GPS L1 signal and that the performance of the combined (GPS+Galileo) signals was always better in both nominal and interference testing scenarios. The accuracy in live mobile testing could only be partially assessed due to the limited number of Galileo satellites available at the time.

The results of the testing showed that Galileo support is mature in most precision professional receivers and, where it is not, manufacturers are ready to implement changes and improve their firmware. Chipsets for the mass-market mainly support Galileo as an adaptation of their legacy GPS technology, so the full potential benefits of the modernised Galileo Signal in Space (SIS) are not necessarily exploited. Those chipsets, unlike professional ones, are also required to maintain minimal battery power drain and have to rely on simplified front ends and antennas.

Galileo for smartphones

Smartphones and tablets are often connected to Internet, allowing them to fully explore web based Assisted GNSS (reducing their time to first fix (TTFF) to a few seconds). In other words the navigation information (on satellite orbits and clocks), which normally needs to be decoded from live SIS can be retrieved from the Internet instead, with a validity of several days. In addition the computational core of the GNSS receiver is a small piece of silicon Intellectual Property (IP) inside a System on Chip (SoC) which also integrates the application processor.

“The Galileo E1 Open Service (OS) signals are designed with an in-phase pair of data and pilot,” explained Bavaro. “The availability of a (data-less) pilot channel represents a unique asset for smartphones as it allows a level of processing gain, and therefore sensitivity, only bounded by the quality of the receiver's internal oscillator.”

Such oscillators have greatly improved in the last decade driven by the need for high data-rates on cellular networks (4G) and WiFi. From a 200 milliseconds signal snapshot a smartphone can derive a very precise, unambiguous ranging signal to Galileo satellites by leveraging the pilot codes. This is much harder to do with GPS signals.

The Galileo E1BC signals also overlap in frequency with GPS L1 thus they don't require additional radio frequency circuitry inside a GNSS chip, just more silicon for digital signal processing. The binary offset carrier (BOC) modulation used by Galileo is more robust compared to GPS in most modern receiver architectures and another obvious advantage of Galileo E1BC modulation is that it has three times higher accuracy than the legacy GPS.

Galileo uses longer codes compared to GPS, which makes the code synchronisation search longer and more difficult to perform for a receiver, but in turn the ranging has much larger ambiguity of 1200 km compared to 300 km for GPS. Again this greatly reduces the search space for all receivers.

Trends in GNSS

Bavaro identified the major trends in GNSS research as Protect, Toughen and Augment (PTA). There is a need to introduce rules to protect the valuable spectrum which is the basis for provision of position and time globally. In parallel GNSS vulnerabilities must be addressed, making satellite navigation more resilient to malicious attacks or involuntary-induced signal anomalies such as jamming and spoofing. And finally synergies with other technologies must be assessed that can increase availability and robustness.

Today everyone carries at least one GNSS receiver and the mass market needs ever increasing availability, accuracy and reliability. With the advent of drones and self-driving vehicles coexisting with humans’ personal space there is a requirement for even more accuracy, availability and reliability. This means there is a need for both an enhanced Signal in Space and the integrity service provided by EGNOS.

“Today satellite positioning is done by billions of people using signals designed 40 years ago as secondary channels for military users - GPS L1 C/A stands for ‘Coarse Acquisition’,” says Bavaro. “Europe has a unique opportunity to provide the new de-facto standard for GNSS. It is obvious that, if all the vulnerabilities are accounted for, it is time to start building user accuracy, availability and reliability on top of a modern PNT system, and Galileo may well be all or part of that system.”

“Galileo signals are inherently more accurate. The future for locations is based on accuracy, so Galileo is an answer,” he concluded. “Galileo was born to be compatible with GPS so it is also relatively cheap and easy to integrate with existing GNSS receiver technology.”

“Galileo signals are inherently more accurate. The future for location is based on accuracy.”

More information:
WhereCamp
European Commission Joint Research Centre (JRC)

Media note: This feature can be republished without charge provided the European GNSS Agency (GSA) is acknowledged as the source at the top or the bottom of the story. You must request permission before you use any of the photographs on the site. If you republish, we would be grateful if you could link back to the GSA website (http://www.gsa.europa.eu).