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Space Engineering [clear filter]
Friday, October 19
 

3:45pm EDT

The use of GPS/GNSS on Earth and in space
Today, the Global Positioning System (GPS) developed by the U.S. Department of Defense is essential for countless applications. Of course, it provides good positioning (~m) for vehicles or pedestrians, but it can also provide very precise positioning (~dm or cm) for surveying or agriculture. Not forgetting the transmission of a very accurate time (~ns) for communication systems or financial networks.
Also, from almost the beginning of the GPS, the question of its use in space was studied, but it took some time and experience before its actual use. Today, it is common to find GPS receivers on board low Earth orbit (LEO) satellites, and a lot of research and development is going on regarding its use in higher orbits, even above the GNSS constellations. To date, the farthest position obtained thanks to GPS was at an altitude around 150 000 km.
Now, with the availability of three other global navigation satellite systems (GNSS), namely GLONASS (Russia), Galileo (Europe) and BeiDou (China), and the availability of civilian signals on several frequencies, the use of navigation satellite systems will continue growing, offering better performance and better security.
In this talk, we will first present the GNSS, with a brief history, the current status of the different systems, a summary of their applications, a description of the space segment, and an introduction to the GNSS signals and the basic operation of a GNSS receiver.
In a second part, we will focus on the use of GNSS in space, describing the different challenges, namely the very weak signals, the unfavorable geometry and the high dynamics.
 

Speakers
DJ

Dr. Jérôme Leclère

Research professional, ÉTS
Jérôme Leclère received his Ph.D. in the GNSS field from École Polytechnique Fédérale de Lausanne (EPFL), Switzerland, in 2014. Since 2015, he is with the Laboratory of Space Technologies, Embedded Systems, Navigation and Avionic (LASSENA), at École de Technologie Supérieure... Read More →



Friday October 19, 2018 3:45pm - 4:05pm EDT
Room CD Concordia Conference Center, MB Building 9th floor, 1450 Guy St, Montreal, QC H3H 0A1

4:05pm EDT

Space Autonomy and Making Mobile Vehicles Intelligent
In the past, the navigation, guidance and control of Earth satellites relied extensively on human intelligence at the ground station instead of computer intelligence on-board the spacecraft. With recent developments in powerful space-qualified microcomputers, model-based design techniques, automatic code generation and failure-detection-identification techniques, there is now a trend to transfer some of the decision-making to the on-board system, transforming the ground operations from detailed task planning to higher-level supervisory activities. In contribution to this trend, the European Space Agency (ESA) initiated the PRoject for On-Board Autonomy (PROBA) series of satellite missions, with the objective to demonstrate the benefits of on-board autonomy, in particular, in the area of Guidance, Navigation and Control (GNC). This presentation will describe the PROBA design and operation philosophy, and highlight the various GNC innovations that were demonstrated in orbit. Then, this talk will present how this design philosophy is extended to the development of autonomous GNC technologies for planetary exploration vehicles and unmanned aerial vehicles (UAV), such as hazard detection and avoidance, vision-based navigation, real-time mobile mapping, autonomous or pilot-assisted guidance and control for UAV. Ultimately, these technologies are making mobile vehicles intelligent, by increasing their autonomy, performance, reliability and safety while, at the same time, reducing their operational costs. 

Speakers
PW

Pamela Woo

Guidance, Navigation and Control Engineer, NGC Aerospace Ltd.
Pamela Woo is a Guidance, Navigation and Control (GNC) Engineer at NGC Aerospace. Her expertise is in the development of Attitude and Orbit Control System (AOCS) software for satellites. She is currently working on the spacecraft GNC software for the ESA PROBA-3 formation flight mission... Read More →


Friday October 19, 2018 4:05pm - 4:25pm EDT
Room CD Concordia Conference Center, MB Building 9th floor, 1450 Guy St, Montreal, QC H3H 0A1