The GPS-jammer affecting aircrafts around Estonia is located in Russia, about halfway to St Petersburg from Narva, Estonia.
This is shown by plotting the highest density of intersecting radio horizons of jammed aircrafts on a map.
Further, a drone-based method supports it.🧵
The GPS-jammer affecting aircrafts around Estonia is located in Russia, about halfway to St Petersburg from Narva, Estonia.
This can be shown by plotting the highest density of intersecting radio horizons of jammed aircrafts on a map.
Further, a drone-based method supports it.
This is a more zoomed in view of the likeliest position of the GPS-jammer operating around Estonia and recently famous for causing the brand new Helsinki - Tartu flight line to cease operating.
See this and linked posts for methodology.
This took some time to make so I will continue the thread tomorrow with drones, more radio horizons and closer explanations.
Data available if interest is shown. Stay tuned.
I should add. The jammer over Estonia is very different in scope and temporal profile. A higher proportion of aircrafts are affected around Estonia and the jammer is almost always on. See plots.
Proportion measure (%) is a bit skewed during nights though, because there are so few planes in the air. And this effect is even stronger around Estonia. Plots show last months total number of observations for respective area.
Estonia jammer is south-west of St Petersburg, part 2: drone proof!
Drone photographer @kristjanlust made this beautiful flight in Narva, pointing east. At altitude 60 meter all GPS is gone. This gives us a new radio horizon.
The horizon intersects* with location shown by me.
This drone method is very exciting since it is a direct observation, not mediated by translation through ADSb-layers.
It just shows: at this exact position the jammer jams from 60 meter and up.
Very useful!
Map of drone flight position, its radio horizon and previously found jammer position.
*As you can see, they dont match perfectly. We are ~20 km off.
Given unknown margins of errors of mine and horizon method and jam height I assume they actually overlap. Open to protests!
If we move our center to to the most likely position, use to find the highest peak within 15 miles and assume an antenna height of 50 meter we get these jam-radio horizons.
Almost all jammed positions are within the reach of a transmitter at that point. heywhatsthat.com
So, we have two ways of saying that the jammer is SW of St Petersburg.
If we test that hypothesis we get a radio horizon that contains most actually jammed aircrafts. So, we predict what actually happens.
None of this would have been possible without this excellent code by @PajalaJussi Thank you and sorry for no initial credit.
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