I’m curious what may be the cause of very sporadic ground reception. I’m about 10.2 nm from our local international airport and it’s non line of sight from my position. I am running two sites for testing and tuning purposes and I recently bumped up from PiAware 3.0.5 to 3.1.0 on both sites (still using mutability). I know there have been some recent tweaks on how PA processes ground messages looking through the repository, but I can’t explain what I’m seeing: Here is a 6-hour duration collectd graph for reference from one of my sites:
As you can see there are sporadic increases in both positions and plane-count. Looking at it in real-time as it’s happening, it’s definitely attributed to ground sightings as all of a sudden for the 5-15 minute duration I can see the map light up like a Christmas tree when zoomed into our main airport with planes on the ground.
I guess my question that comes to mind is why is it for short durations only? I haven’t seen correlation in atmospheric conditions/weather or other major changes during this time (obviously the naked eye and radar/doppler cant tell the whole story when it comes to RF). Are there some planes outfitted as relays that are pissing signal on me when in range, or is this some strange anomaly where signal randomly echoes towards my position for 5-15 minutes at a time? I suppose the algorithm is still being refined and I am viewing this as a step in the right direction over prior versions, but felt the need to ask since I’m s̶o̶r̶t̶ ̶o̶f̶ totally stumped over what I’m seeing.