On Tue, 24 May 2016 16:15:15 -0700, you wrote: > >kb...@n1k.org said: >> The glitches are to narrow (short duration) and far to regular for the >> ionosphere to be the issue. > >Is multipath from a large airliner in a landing pattern likely to cause that >sort of problems? > >I'm 20+ miles off the end of SFO, but it's common to see large planes going >over and turning to line up for a landing. On my one-of-these-days list is >to grab the airline location data and see if it correlates with GPS glitches.
Back when I did a lot of transmitter hunting, I listened to multipath from airliners from 2 meters to 23 centimeters. The 2 meter directional antenna I ultimately designed was good enough to not only track airlines by their reflected RF, but it could see reflections and shadows from nearby objects like street lights and trees which ultimately limited outside performance testing. As you can calculate from the geometry, the flutter started out fast and decreased in frequency until there was a slow null/peak and then it reversed. If the same happened with GPS, then maybe the receiver could briefly lock onto the reflection from the plane producing a different solution for a short time. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
