FYI, Space Weather is iffy today for GPS!
4 ALERT: ANOTHER STORM REACHES SEVERE LEVELS
published: Monday, June 22, 2015 20:18 UTC
The geomagnetic storm began as forecasted and quickly ramped up to severe (G4) levels. SWPC issued the G4 Alert at 1858 UT (2:58 pm EDT), after the storm slammed into Earth at 1839 UT (2:39 pm EDT). This is the same intensity level reached in March, 2015 during the St. Patrick's Day storm.
SHG
I was on office duty yesterday, any reports out there as to how these high K values affected GNSS or RTK yesterday?
SHG
Shelby H. Griggs PLS, post: 323904, member: 335 wrote: I was on office duty yesterday, any reports out there as to how these high K values affected GNSS or RTK yesterday?
I was flying a creek drainage capturing data for a demo project on the morning of the 23rd. Part of the area has a railroad trestle with lots of steel. I was aware of the active space weather but the survey grade GNSS was working as it should so I didn't think about it too much. Until I flew a part of the mission that put me over the train tracks; the UA flew a bit erratic and I aborted the mission. The erratic flight was indicative of bad compass heath. I brought the data back and began to process it and what I saw made me think about how the railroad tracks may have had something to do with amplifying the affects of the storm. Right at the point the uav was over the tracks, the GPS geotagged position for each photo event went crazy (it wasn't that great for any of it). I had time to fly two passes longitudinally before aborting the mission. Fortunately the software solves for pitch, roll and yaw of the camera and only uses the initial position to begin the SIFT routine. In the attached screen shots, you can see the the initial camera positions in blue and the calibrated cameras after processing in green. Note the "X" pattern: One leg of the X being generated from one pass over the tracks and the other from the next pass coming in the opposite direction .
