At 12:14 AM 11/18/2002 -0800, Randall Clague wrote:
On Sun, 17 Nov 2002 21:28:17 -0800, Pierce Nichols <[EMAIL PROTECTED]> wrote:> Then it's got to be spurious. The only thing that could make >negative G during the ascent is drag. Of the whole vehicle, this is true. Vibration can spoof an accelerometer, though, and I think Dave W thinks this is what happened.
Well, there are two potential spoofing modes here. First the vibration could cause the acceleration sensor itself to produce spurious data. I find this explanation a bit unsatisfying, because I believe it requires a vibration frequency well above the bandwidth of the analog sensor with significant amplitude. The second is a spurious peak resulting from the frequency of the chugging exceeding half the sampling rate of the A/D converter (i.e. undersampling). I like this one even less, b/c it is my understanding that spurious results from undersampling appear only if you interpolate the data or run it through a fourier transform. Dave W -- am I wrong about that?
-p
Mars or Bust!
www.marssociety.com
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