Labroides
Captain
Flight distance : 9991457 ft
Australia
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michaelts Posted at 2017-7-6 10:40
"Normally interference won't cause a loss of GPS. The way you describe GPS picking up at altitude and dropping as you descend, it sounds like you did not have a clear view of the sky and had obstacles or terrain that blocked your sky view."
No, there were no obstacles blocking the sky view. The first time I was in a park. Shortly after the take off, the monitor displayed "Compass calibration error" and the drone switched to ATTI. The second time I was on a large ship. Again everything was perfectly normal at the take off, and then I saw "Compass calibration error" and ATTI mode. At that point I toggled S2 to activate RTH, the drone did not respond, and was rapidly drifting away in the direction of the wind. I started ascending as fast as I could. Once the drone was very high above the ship, "Compass calibration error" disappeared, the drone switched to GPS mode, I toggled again S2, and this time it activated RTH. But as the drone was descending towards the ship, I again saw "Compass calibration error", ATTI mode, and the drone again started drifting away. I don't know what caused this, so I am speculating that it was storng magentic interference with something, maybe the ship's huge rotating locators/antennas.
You didn't mention the key element in your previous post.
If your Phantom gets conflicting information from the compass and the GPS, it can't handle the data conflict and because it can't fly without compass, it ignores GPS data and bingo, your Phantom is in atti mode.
The solution is to never get into those situations that give you a compass error.
Never calibrate your compass close to a lot of steel (including reinforced concrete).
Never launch from steel or reinforced concrete surfaces (like ship's decks).
Get a good compass calibration and leave it alone. |
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