# The July Galileo Outage: What happened and why

DevFeed: [The July Galileo Outage: What happened and why](<https://devfeed.tech/articles/the-july-galileo-outage-what-happened-and-why-36403.md>)

Original publisher: [Read original article](<https://berthub.eu/articles/posts/galileo-accident/>)

Published: 2019-11-07T08:48:53Z

Content type: article

Language: en

Sources: [Bert Hubert's writings](<https://devfeed.tech/sources/bert-hubert-s-writings.md>)

Topics: [navigation](<https://devfeed.tech/topics/navigation.md>), [systems](<https://devfeed.tech/topics/systems.md>)

Tags: [atomic](<https://devfeed.tech/tags/atomic.md>), [clocks](<https://devfeed.tech/tags/clocks.md>), [gnss](<https://devfeed.tech/tags/gnss.md>), [orbit](<https://devfeed.tech/tags/orbit.md>), [outage](<https://devfeed.tech/tags/outage.md>), [performance](<https://devfeed.tech/tags/performance.md>), [precision](<https://devfeed.tech/tags/precision.md>), [systems](<https://devfeed.tech/tags/systems.md>), [technical-article](<https://devfeed.tech/tags/technical-article.md>), [timing](<https://devfeed.tech/tags/timing.md>)

## AI overview

An excerpt examines the July Galileo outage, explaining how GNSS operation depends on accurately modeling satellite orbits and atomic clocks and distinguishing errors in satellite, clock, and ground timing data.

## Source excerpt

By bert hubert / bert@hubertnet.nl This post is an excerpt of a far longer post on Galileo, its structures and the cause of the outage. Here we'll only focus on the outage - the potential underlying reasons behind it are described in the full article. Since the week-long outage in July I've been fascinated by Galileo and, together with a wonderful crew of developers, experts and receiver operators, have learned so much about what I now know are called 'Global Navigation Satellite Systems' or GNSS.