News & Events

13. January 2015

GATE Test of the Universität der Bundeswehr München (University of Applied Sciences of the German Federal Armed Forces in Munich)

The Universität der Bundeswehr München recently had two days of testing at Galileo Test- and Development Environment GATE Berchtesgaden. On the first day 'Feared Event' tests were performed with a commercial off the shelf receiver. 'Feared Events' in reality may for example be drifts of a navigation satellite's onboard clock. Such disturbances can influence the positioning of GNSS receivers and the calculated positioning on earth could be subject to failures. The disturbances occur only very rarely in reality, but if they occur, they might be of great effect. The opportunity to test 'Feared Events' at GATE outdoor test environment in Berchtesgaden is therefore especially valuable. A 'Feared Event' can be simulated by careful modified time synchronization of 'pseudo-satellites' which are located on top of surrounding mountains. At the test campaign a satellite's clock drift should be identified very quickly, excluded from positioning and herewith the receiver be enabled to keep the integrity of the positioning solution. Three staff-members tested their developed algorithm upfront statically at the GATE office followed by nearly the same test campaign performed dynamically in IFEN's measurement vehicle at the test range Berchtesgaden. Early statements said that the test campaign's results were highly promising.

 

On the second day, similar measurements were performed with different navigation receivers at the same time. One receiver was built-in the IFEN measurement vehicle and got fed with navigation signals from a GNSS antenna which was installed on the top of the van. The second receiver was installed inside a second car and was connected to a GNSS antenna installed on its roof. The car's motion data, e.g. velocity, acceleration and change of direction, were also included in the measurements. The driving skills challenge during the following dynamic test campaign was to keep the same distance to the car ahead.

For the last test drive the second GNSS antenna was mounted directly on top of the measurement vehicle and the receiver was assembled in the vehicle in order to exclude possible deviations in distance between the two antennas.

Referring to first statements of the scientific staff, this test campaigns were also very successful.

 

For more information please also see the webpage of ISTA at Universität der Bundeswehr München http://www.unibw.de/nav/ista


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