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Jun 18, 2009, 12:52 PM
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Heat gun vs IMU


Using pitch & roll drift to estimate the yaw drift is a myth you've been busting for years. It didn't work with the IDG300, but that was a much bigger package.

Let's blast the IMU with the heat gun & see what happens. If the temperature changes slowly enough to keep them all matched, U can probably derive yaw drift from tilt drift. In flight, they emit different amounts of heat, they're blasted by prop wash & their heat capacities differ.

If U get tired of reading about 3DOF IMU's, U can give up & install an AK8976A from www.asahi-kasei.co.jp. That's a 3 axis magnetometer & 3 axis accelerometer on 1 chip.

Unfortunately, those single chip 6DOF deals R exclusively for phone companies like Apple. You're stuck with an HMC5843 for $20 & an ADXL320 for $8. That would double the IMU tag.

AUTOMATIC TAKEOFF & LANDING NOTES

For Vika 2 automatic takeoff & landing, U don't have a position signal until a minimum altitude is reached & U can't tell when the minimum altitude is reached without a position signal. Ramp collective & fix attitude, hoping the sonar field catches it above a certain level before it flies away. Get the starting position when minimum sonar amplitude is reached & engage position hold.
Last edited by Jack Crossfire; Jun 18, 2009 at 04:34 PM.
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