4 ms·
That's a pretty interesting set of data. Even one minute outages of satellites seem to be logged, even though that's probably pretty normal for receivers to hav
by creato 7y ago
That's a pretty interesting set of data. Even one minute outages of satellites seem to be logged, even though that's probably pretty normal for receivers to have to deal with for other reasons.
Who are the consumers of outage information like this? Or is it simply informational?
- michaelt 7y agoThere are networks of precise GPS receivers in known locations creating permanent reference networks [1] [2] [3]. High precision applications can gather 'observables' for a few hours then 'post-process' them, comparing them to the data from the permanent reference network, to achieve sub-centimetre accuracy. Now, obviously these networks will have spotted the outage on their own if they're any good, but extra reports amount to saying "Yep, we saw that too" GPS is also fairly old and run in the aerospace-and-military tradition where every outage requires an announcement made in NOTICES IN ALL CAPS because that's what pilots did in 1950 :) [1] http://www.bigf.ac.uk/ http://www.bigf.ac.uk/ [2] http://www.epncb.oma.be/ http://www.epncb.oma.be/ [3] http://www.igs.org/network http://www.igs.org/network
- FabHK 7y agoThe "NOTICE ADVISORY TO GALILEO USERS" (NAGUs) are also all caps (here the announcement of service resumption [1]), like NOTAMs ("Notice to Airmen"). I understand that the Telex network used a 5-bit code with only caps [2], but today? Can't we use Unicode, or even some ASCII variant? [1] https://www.gsc-europa.eu/notice-advisory-to-galileo-users-nagu-2019027 https://www.gsc-europa.eu/notice-advisory-to-galileo-users-n... [2] https://en.wikipedia.org/wiki/Baudot_code#ITA2 https://en.wikipedia.org/wiki/Baudot_code#ITA2