Hey everyone, I'm new to this site. I'm starting on a uav project and I had a question that googling hasn't sufficiently answered.
I've noticed that, for tilt sensing, many designs that I've seen are using an infrared setup to detect the difference in temperature between ground and sky. Is there an advantage to this setup over digital gyro's or accelerometers? Possibly price or sensitivity?
Also, after reading up on the subject, I'm not sure I understand the practical distinction between gyro's (like this
) and accelerometers (like this
). It seems that both sense tilt on a set number of axes, with the accelerometers also being able to measure acceleration.
In addition to automated flight, I'm hoping to hoping to create an augmented reality overlay for a wireless camera feed from the uav. Some of my ideas for features would be, a 3d, very large cylinder overlaid on the video feed to simulate a visual fence that sits on the earth that would demarcate the distance that the uav can travel before leaving radio range. Also, a blue line suspended in space showing the path that the uav has traveled, for instance, after taking off, if you banked the plane long enough to see the point of take-off there would be a line starting on the ground reaching into the air. Also, arrows hovering over points of interest, like way-points or the take-off and landing area.
To do this would require, having an updated 3d point in real space. Hopefully a gps module will fill this need, though from what I've read, altitude sensing for a gps sensor may not be accurate enough. And an accurate heading and yaw/tilt sensing. I've written a program using processing
that takes input from a video source and can overlay the features that I mentioned earlier using made-up positioning data. So for this setup, does it seem like a gps unit, (for lat,long and altitude) and an accelerometer for yaw and tilt would work? If so, the only thing I'd be missing would be the heading. I wondered though, since the plane is always moving, and I have constant lat and long measurements, wouldn't it be possible to calculate the heading of the uav? Or would that not be accurate enough and require a magnetometer?
Thank you for reading,