The July Galileo Outage: What happened and why

efm wrote: post #4

ahubert wrote: post #2

author here - if anyone has any questions or remarks, let me know!

Thanks for writing this. The title doesn't mention that Galileo is a Global Navigation System (GPS).

[deleted]

Re: The July Galileo Outage: What happened and why

#6

Post by jtwaleson » Thu, Nov 07, 2019, 9:06 PM UTC

When was the last time GPS had issues like this? I can imagine that during the early years this happened there as well? Or maybe not, as military quality engineering requirements were stricter.

Re: The July Galileo Outage: What happened and why

#7

Post by toyg » Thu, Nov 07, 2019, 9:20 PM UTC

jtwaleson wrote: post #6

When was the last time GPS had issues like this? I can imagine that during the early years this happened there as well? Or maybe not, as military quality engineering requirements were stricter.

Or rather silence requirements were stricter. The military is not in the business of publicising failure and weaknesses.

Re: The July Galileo Outage: What happened and why

#8

Post by michaelt » Thu, Nov 07, 2019, 9:23 PM UTC

ahubert wrote: post #2

author here - if anyone has any questions or remarks, let me know!

I gather the US GPS system has "Autonav mode" where each satellite has long-term ephemerides, allowing 60 days of reduced-precision operation if the ground segment fails. Does Galileo have no such thing, or had the errors propagated into such data by the time someone sounded the alarm?

Re: The July Galileo Outage: What happened and why

#9

Post by 9nGQluzmnq3M » Thu, Nov 07, 2019, 9:31 PM UTC

efm wrote: post #4

ahubert wrote: post #2

author here - if anyone has any questions or remarks, let me know!

Thanks for writing this. The title doesn't mention that Galileo is a Global Navigation System (GPS).

GPS refers specifically to the US system.

Re: The July Galileo Outage: What happened and why

#10

Post by pacaro » Thu, Nov 07, 2019, 9:33 PM UTC

9nGQluzmnq3M wrote: post #9

efm wrote: post #4

Earlier quoted context omitted.

Thanks for writing this. The title doesn't mention that Galileo is a Global Navigation System (GPS).

GPS refers specifically to the US system.

Indeed, the second paragraph spells out that this is a Global Navigation Satellite System (GNSS) and places it in context with GPS, GLONASS, and BeiDou