3 ms·
Acoustic triangulation of accelerometers in upper stage helped pinpoint the strut, and using only 0.893 seconds of data (unless the accels were in the part that
by hcrisp 11y ago
Acoustic triangulation of accelerometers in upper stage helped pinpoint the strut, and using only 0.893 seconds of data (unless the accels were in the part that kept transmitting). That means the streaming sample rate must be quite high!
- hamiltonkibbe 11y agoassumong 330m/s for the speed of sound, you can get 1 inch of precision at a sample rate of just under 13kHz. With 3 channels of 12-bit accelerometer data that's ~ 58kBps with no compression which doesn't seem too out there. Of course you can get a pretty close approximation at much lower sample rates (/2, /4, /8, /16) using band-limited interpolation
- tsotha 11y agoAren't we talking about the speed of sound in helium, though? That should be faster.
- baq 11y agohelium is 972 m/s, aluminum 5100 m/s, steel 6100 m/s. depending on what they actually measure, correct triangulation sounds like a non-trivial problem; good job spacex for solving that. (unless your cad software does that for you :))
- TeMPOraL 11y ago> (unless your cad software does that for you :)) As far as I can tell, they write quite a lot of their CA* software ;).
- deleted 11y ago[deleted]