![]() ![]() You may start out OK and lose a good fix in flight since the effects are variable. While at a specific point and place you might be OK in general GPS performance can be dramatically affected by solar electromagnetic storms. ![]() This effects GPS in commercial aircraft as well as our drones. It is a well proven fact that you will find a great deal of documentation regarding the impacts and reasons. There impact of K index is not a speculation. A couple of weeks ago the K index reached a high of 8 but I didn't observe any anamolous performance in the flight of either my Phantom or my Hexacopter. The jury is also out with regards to GPS performance during periods when the Solar K Index is high. I personally don't subscribe to this idea and to that end I did a video of some tests I performed on both my Phantom and my GoPro equipped F550 hex and I was unable to detect any interference in either the two GPS L-Band allocations or the Glonass allocation. Some have theorised that GPS performance can be impeded by interference from the electronics inside the Phantom or even from noise generated by a GoPro camera. Most GPS units have a small lithium cell to provide short term battery backup to the area where this almanac data is stored so that when you swap a flight battery out the Phantom will aquire a suitable lock much quicker. If a GPS device, and this includes satnavs as well as GPS enabled multirotors, hasn't been used for a while it first needs to aquire info on satellite positions, this is usually referred to as the almanac or ephemarous, two line Kepler data that describes the satellite's orbit. If you are flying in the cold only the IMU needs to warm up to operating temperature. ![]()
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