GALILEO down since pm Fri 12/7/19

[pzu]

GALILEO down since pm Fri 12 July

https://www.bbc.co.uk/news/science-environment-48985399

👇🏼⛵️⛵️ 🚠🛠🔌

PZU - Out of Africa (Retired)

[capngrog]

I think that most users of satellite navigation/positioning systems (SNPS) have no idea of how vulnerable these systems are. So many processes rely on these systems that compromise of, or damage to, these systems would cripple worldwide economies. SNPS are not the only technology vulnerable to accident or fiddling.

Just my opinion.

Cheers,
Grog

[FarWest]

Not just your opinion:

https://www.gov.uk/government/public...lackett-review

Satellite-derived time and position: Blackett review.

Many of our critical services, from telecommunications to transport, rely on global navigation satellite systems (GNSS) to operate.

This report sets out the findings of a review exploring the UK’s dependency on GNSS. It covers:

• threats and vulnerabilities
• sector dependencies (both current and future)
• mitigations
• standards and testing

It recommends a number of measures to make critical services more resilient to disruption or loss of GNSS.

Published 30 January 2018

FW

[HEATHROW DIRECTOR]

Out with the Dalton Computers chaps...!

[kriskross]

And don't forget --- MAPS!!!

[Klauss]

Hi,
does anyone have Galileo-based or enabled avionics ?
Effects ?

[The Ancient Geek]

Not a problem, the enhanced Galileo accuracy services will not be used until the constellation is complete.
The current Galileo satellites are effectively additional GPS satellites of which there are plenty so not an issue.

[ATC Watcher]

The current Galileo satellites are effectively additional GPS satellites

Don't tell this to the GSA/ESA guys they will get mad . In fact Gallileo is a lot more than GPS , but that is for another topic.
Fortunately the problem seem to be on the ground, not on the Sats in place .

[gearlever]

Constellation Information

[atakacs]

Well this is somewhat embarrassing to say the least. What kind of ground issue could lead to such a persistent failure? I'm sure that all systems muss be redundant !? Sure it was still in deployment phase but this warrants further digging...

[The Ancient Geek]

Looks like it might be fixed, my receiver reports 6 Galileo satellites in range and green

[atakacs]

Originally Posted by The Ancient Geek

Looks like it might be fixed, my receiver reports 6 Galileo satellites in range and green

and do you get usable data ?

According to their status page the whole thing is still down

[SysDude]

Ground Failure

Originally Posted by atakacs

Well this is somewhat embarrassing to say the least. What kind of ground issue could lead to such a persistent failure? I'm sure that all systems muss be redundant !? Sure it was still in deployment phase but this warrants further digging...

Any upload that corrupts the spacecraft or payload software, or commands an inadvertent shutdown, is a "ground issue". I suppose that malicious uploads and jamming fall into this category, but I doubt this is the case.

My bet is that a software update broke the constellation.

[atakacs]

Well it might be so (software issue) but it any case it seems like a major issue as it is still ongoing. Surprised that it doesn't make more "noise" in the news. After all this was supposed to be a viable alternative to GPS....

[esa-aardvark]

This morning my newish cell-phone shows 8 Galileo,
all coloured red, meaning no signal.

[atakacs]

Yup

Can't imagine a hardware issue that would not be fixable within 24/48h. Muss be software

[esa-aardvark]

Maybe a mis-op, Fucino do have previous form in that area.
Last time it was 'around the world in 80 days' for a certain satellite.

[SysDude]

Originally Posted by esa-aardvark

This morning my newish cell-phone shows 8 Galileo,
all coloured red, meaning no signal.

Careful with the apps. Some will paint the location on the skymap based on a database, not the actual signals.

I am currently decoding both E1 and E5 telemetry but the usability flags are most likely turned off.

[esa-aardvark]

I think the satellite position comes from the almanac.
Signal, however, is usually to be trusted.

[SysDude]

Originally Posted by esa-aardvark

I think the satellite position comes from the almanac.
Signal, however, is usually to be trusted.

Yes, we are in agreement. The almanac data provides a coarse spacecraft position, while the ephemeris data is finer and includes clock corrections.

Since the telemetry is embedded in the carriers, and I am receiving telemetry fine, this means that the spacecraft and payloads are working.

My bet is that they are needing to update new ephemeris data. Since the onboard oscillators take a long time to stabilize, my guess is that the clocks were reset or turned off for some reason and now need time to stabilize. Once stabilized, the new ephemeris data can be generated and uploaded to the payloads... in effect, a reboot of the constellation.

Then they will set the carrier flags to "usable".