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Measuring roll angle using 2 ultrasonic sensors

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dan7

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Hi...I'm still new here. I'm doing project on an airplane and I want to measure roll angle of an RC plane using 2 ultrasonic sensors. Anyone know the algorithm to do so?
Btw, I'm using PicBasic Pro language to program into the microcontroller.
 

You may want to explain, how the sensors can be able to measure a roll angle. I don't see it.

It works of course shortly above a horizontal plane, which shouldn't be considered as the general case - just for safe operation.
A g-sensor can do perfectly.

P.S.: In the 90th, several NATO Phantom jets were lost during low-level fligths over sea area, controlled by height radar.
The sea waves caused fast steering actions, that exceeded the structural strength of the plane.
 

I have to mention this earlier: it's for measuring roll angle during landing so it's near to the ground.

The ultrasonic sensor is attached at both the wing tip. During landing, the ultrasonic sensors measure the distance of the wing tip from the ground. The difference of the distance from the ground of both wing tip can be used calculate the roll angle. Do you understand me?
 

I understand, but I don't think that it's a good idea. Ultrasonic doesn't work well with high airspeeds. You may also have different surface structure at both sides, at least when landing on a meadow. G-sensor is much more reliable and cheaper, considering overall effort..
 

g-sensor u mean accelerometer?
i'm using accelerometer as well, only one axis is used...the ultrasonic is like a redundant measurement
besides, i'm having problem with the accelerometer signal because of vibration and noise. i used filtering and it smooths the signal a bit but still improvement is still needed. any suggestion?
 

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