Home » News » Four in one launch - Ariane brings Galileo satellite on its orbit for the first time
 
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GEOsat News

We are on – catalogue deutscher Raumfahrtakteure (KaRA)

Katalog deutscher Raumfahrtakteure
catalogue deutscher Raumfahrtakteure (29 MB)

We are pleased to present the first edition of the catalogue of German space players (Katalog deutscher Raumfahrtakteure - KaRA). With the participation of GEOsat GmbH, the German Aerospace Center (DLR) has created the catalogue. The full range in the space sector of federal and state authorities, universities, technical colleges, non-university research institutions, associations, networks and associations, companies, incubators and media is evident in the catalogue.

KaRA is primarily aimed at politicians, multipliers and cooperation partners as well as at non-aviation science and industry. The catalogue is intended to clearly illustrate the activities and competencies of the German space actors.

 

Upcoming Global Positioning System WeekNumber Rollover Event

The GPS Internal Navigation Time Scale “GPS Time” is based on the weighted average of GPS satellites and ground station clocks.  GPS Time is used for user navigation solutions.  A nanosecond error in GPS Time can equate to one foot of position (ranging) error.  The WN parameter is provided via a ten (10) bit parameter–or “counter.”The valid range of values for the WN parameter is 0 to 1023 (or 1024 total values).  The WN parameter is incremented by one each week. At the end of the 1024thweek, the counter experiences a rollover (resets) to 0.  Each WN rollover event defines a new GPS Time Epoch.  The WN value is referenced to the start of the current GPS Time Epoch.  The last WN rollover was August 21, 1999.  GPS Time is currently in the second Epoch.  The next WN rollover is April 6, 2019.

Source: https://ics-cert.us-cert.gov/sites/default/files/documents/Memorandum_on_GPS_2019.pdf

The GEOsat recommends that you, regardless of the manufacturer, play a current firmware to the GNSS receivers to take into account the upcoming GPS week rollover.

If you need assistance for this, we will be happy to assist you at any time.

NAVSTAR GPS

Ariane Start

An Ariane 5 rocket has launched four additional Galileo satellites, accelerating deployment of the new satellite navigation system.

The Ariane 5, operated by Arianespace, lifted off from Europe’s Spaceport in Kourou, French Guiana, at 13:06 GMT (14:06 CET, 10:06 local time) carrying Galileo satellites 15-18. The first pair was released 3 hours, 25 minutes after liftoff, while the second separated 20 minutes later.

Over the next few days, engineers will nudge the satellites into their final working orbits and begin tests to ensure they are ready to join the constellation. This is expected to take six months or so.

This mission brings the Galileo system to 18 satellites.

Already, our receivers from GEOmeter up to the GEObox have the possibility to process the Galileo signals.

The satellites already in orbit will allow the European Commission to declare the start of initial services, expected towards year’s end. Two additional Ariane 5 launches are scheduled in 2017 and 2018. The full system of 24 satellites plus spares is expected to be in place by 2020.

Photograph Credits: ESA