Labroides
Core User of DJI
Flight distance : 9991457 ft
Australia
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Nigel_ Posted at 2018-7-30 00:18
I'm not convinced that is correct, I take "lost downlink" to mean loss of control, not just video, but 15 seconds is not enough time for it to be flying back home, it had only got as far as rotating to retrace the last part of it's route looking to regain the control signal having moved out of the way of any obstacle that had blocked the signal, which since it wasn't moving when it lost connection didn't take it very far.
A proper flight back towards home doesn't begin until 30 seconds after loss of connection, so basically it was still waiting for the ship that had blocked the signal path to move out of the way before attempting to flying directly home through that ship.
I'm not convinced that is correct, I take "lost downlink" to mean loss of control, not just video
You might not be convinced but you'd be wrong.
Downlink means the video + telemetry signal that travels down from the Phantom to the controller.
This can be confirmed by looking at the recorded data from the many, many cases where the Phantom loses just the video+telemetry link.
It is different from the control signal or upling which travels up to the Phantom.
but 15 seconds is not enough time for it to be flying back home, it had only got as far as rotating to retrace the last part of it's route looking to regain the control signal
While the Phantom has rotated from facing 72.8° to facing 175° during the missing 15 seconds, this is accounted for by looking at the joystick movement at the time downlink was lost.
The left stick was pushed to one side - that rotated the Phantom
A proper flight back towards home doesn't begin until 30 seconds after loss of connection
Correction ... after 3 seconds of lost connection, the Phantom commences RTH.
Failsafe RTH will be automatically activated if the remote controller signal is lost for more than three seconds. (p15 of the P4 pro manual)
so basically it was still waiting for the ship that had blocked the signal path to move out of the way before attempting to flying directly home through that ship.
Ship? What ship?
The Phantom was launched from a point about 10 ft above sea level.
At the time it lost downlink, the Phantom was approx 126 feet higher then the launch point and 30-40 feet offshore in the surfbreak zone.
There's no way any ship was blocking signal.
What interfered with the signal was the vegetation on top of a small (80 ft) hill 700 feet NE of the home point.
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