AsiaFlyer said:Yeah I have same problem, seems to be less accurate the warmer the bird gets
Next time you hand catch, note how still you have to hold the Phantom to shut down the motors.Mopar Bob said:I think their sensor is not up to the task of measuring the minute amounts of pressure that determines the distance of a few feet. But that's just my opinion.
Meta4 said:Next time you hand catch, not how still you have to hold the Phantom to shut down the motors.
That's how sensitive the barometric sensor is. It detects variations of less than an inch.
The calibration mentioned above sounds like the way to go.
Good pointwetauser said:I suspect that when you hand catch the phantom is not level, and its the auto levelling that can be felt from the gyroscope not barometer
Mopar Bob said:I have had the problem since day one. At ground level, it shows -10 feet, sometimes -5 feet. I found that if I power down the phantom and restart it, the error is reduced significantly. Like from -10 feet to -1 foot after the shutdown. And its consistent. I have done it may 100 flights and it always reduces the error after the power down.
wetauser said:My Attitude was showing at - 200meters ( -656 feet) on my balcony 3 meters up , this never seemed to effect GPS flight, but I have have sent it back to the dealer for investigation , never dared to switch to atti mode just in case it went into space.
I did all the usual IMU advanced calibration nothing worked.
WessexWyvern said:This raises the question for me at least - what altitude is the Phantom reporting -
Above Mean Sea Level
or
Above Ground Level
and is the barometric pressure gauge only correct at 29.92 hg?
Without adjusting the barometric pressure gauge to the current local pressure setting or without setting off from MSL, I would have thought that the Phantom is unlikely to report the altitude to any real accuracy given that GPS altitudes are pretty inaccurate, +/-8-10ft sounds pretty good to me.
jadebox said:WessexWyvern said:This raises the question for me at least - what altitude is the Phantom reporting -
Above Mean Sea Level
or
Above Ground Level
and is the barometric pressure gauge only correct at 29.92 hg?
Without adjusting the barometric pressure gauge to the current local pressure setting or without setting off from MSL, I would have thought that the Phantom is unlikely to report the altitude to any real accuracy given that GPS altitudes are pretty inaccurate, +/-8-10ft sounds pretty good to me.
The altimeter measures the altitude from the ground. It adjusts itself to the ambient conditions when you turn on the quadcopter.
Altimeters like this are accurate to within a few feet.
-- Roger