"The datasheet for the ASIC on your website suggests it should be possible to extract an expanded timebase "image" of the returned waveform. This could be useful for disambiguating between top of trees and the ground (in your example) for instance.…"

"If you meet the length matching requirements (you'll find all the information you need from the DRAM vendors or Freescale), then great - it's hard to tell just from the renderings, but it's just surprising and rare not to see any serpentine traces…"

"Does the DDR SDRAM work? It doesn't look like you have any length matching on your PCB layout (nor does the USB diffpair appear to be routed to control differential impedance)..."

"In this video: https://www.youtube.com/watch?v=4EGQZsu-kkk by John Stowers (www.johnstowers.co.nz) the processing is performed by an onboard Gumstix Overo. The Kinect is pointing down, and by fitting a 3D plane/surface to the point cloud data,…"

"Yes, it has a 3-axis magnetometer for the compass function. I can't recall if the API lets you get raw/uncorrected magnetic readings out - probably not."

"@jeffrey - if only that was true ;-) It remains one of the most locked down pieces of consumer electronics in history. Of course, jailbreaking and writing apps for iOS isn't so bad - you get to use their nice APIs, power management, comms, imaging…"

"I doubt the built-in accelerometers, gyros, and magnetometers are any different *at all* performance-wise from the ones we hobbyists use. iOS even has a built-in sensor fusion (Kalman filter) algorithm perfectly tuned to match the sensors. I…"

"@James re mag at cm, their target market is cellphones and game controllers - there is no motor, and the baseline they could acheive is only a few centimeters anyway. I fully expect an all-in-one eventually. We already have 3-acc+3-gyro and…"

"This isn't all-in-one, it needs an external magnetometer... but otherwise, it looks pretty awesome!"

"Chris, would you mind posting some high-res photos of the flight electronics? I'm sure many of us would be interested :-)
--Hugo"

"You might have more luck googling for Software Defined Radio rather than software modem. As C Moss above said, this is a very widely used idea (both by hobbyists and industry) and you can do many very clever things with it. (However with just the…"

"Looks like you're on the right track.

Don't forget to add noise, drift (random walk), and saturation/clipping to your angular rate and acceleration data coming out of the simulator, otherwise getting your AHRS algorithm working is too easy (just…"

"Wow, 3D printing tech has come a long way! Last I heard the sorts of plastics they use would be far too heavy, brittle or weak for doing something like this. It'll be interesting to see if he can take this to it's logical conclusion and print the…"

"@William, do you think the LISY300 gyros would perform well enough to stabilize a helicopter or quadrotor? (Obviously I'd have to add magnetometer support back into the estimator algorithm)."

"I haven't tried them yet. I too am *very* interested in hearing more about the performance of the LISY300AL. @bcr, are you running an orientation estimator like William Premerlani's DCM estimator, or just looking at the outputs and "eye-balling" it.…"

"Do you have any experience with the LISY300 gyros yet? I have heard that they perform very very poorly compared to the ADXRSx devices. But hey, at least they're cheap :-)"