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GALILEO down since pm Fri 12/7/19

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GALILEO down since pm Fri 12/7/19

Old 14th Jul 2019, 23:46
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pzu
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Thumbs down GALILEO down since pm Fri 12/7/19

GALILEO down since pm Fri 12 July

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

👇🏼⛵️⛵️ 🚠🛠🔌


PZU - Out of Africa (Retired)

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Old 15th Jul 2019, 00:21
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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.

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Grog

Last edited by capngrog; 19th Jul 2019 at 04:53. Reason: correct typo
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Old 15th Jul 2019, 05:59
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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
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Old 15th Jul 2019, 06:55
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Out with the Dalton Computers chaps...!
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Old 15th Jul 2019, 09:19
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And don't forget --- MAPS!!!
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Old 15th Jul 2019, 12:21
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Hi,
does anyone have Galileo-based or enabled avionics ?
Effects ?
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Old 15th Jul 2019, 16:10
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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.
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Old 15th Jul 2019, 16:29
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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 .
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Old 15th Jul 2019, 17:31
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Constellation Information
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Old 15th Jul 2019, 17:45
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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...
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Old 15th Jul 2019, 20:08
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Looks like it might be fixed, my receiver reports 6 Galileo satellites in range and green
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Old 15th Jul 2019, 21:22
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Originally Posted by The Ancient Geek View Post
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

Last edited by atakacs; 16th Jul 2019 at 10:17.
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Old 15th Jul 2019, 23:29
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Ground Failure

Originally Posted by atakacs View Post
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.

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Old 16th Jul 2019, 05:41
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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....
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Old 16th Jul 2019, 09:31
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This morning my newish cell-phone shows 8 Galileo,
all coloured red, meaning no signal.
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Old 16th Jul 2019, 10:19
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Yup

Can't imagine a hardware issue that would not be fixable within 24/48h. Muss be software
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Old 16th Jul 2019, 11:52
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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.
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Old 16th Jul 2019, 15:58
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Originally Posted by esa-aardvark View Post
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.
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Old 16th Jul 2019, 17:22
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I think the satellite position comes from the almanac.
Signal, however, is usually to be trusted.
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Old 16th Jul 2019, 19:44
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Originally Posted by esa-aardvark View Post
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".

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