Kurt <[email protected]> writes: > Ahhhhhhh, > > That's the key. Ublox is much more suited to consider for altitude > reporting. > Anything with Sirf in the chipset name, I wouldn't consider accurate for a > dynamic altitude > situation. Good for position only. (Yeah, I know no AM product uses that > device but for the > purposes of finding a rocket Sirf O.K.) Kurt Savegnago
Oh, I've had problems with Sirf chips even locating rockets -- they take a *long* time to figure out where they are after vertical motion has calmed down. Ballistic descents can give them no opportunity to adjust, leaving you with a poor idea of where the hole is located. We used Skytraq parts before the Ublox, which provided good position information for lat/lon for the whole flight, but which didn't provide useful altitude information. It's all a trade-off between position accuracy and response to dynamics, the Ublox gives you a nice knob to adjust between a few modes, and we pick the mode which allows for the greatest acceleration. This does reduce positional accuracy a bit, but it seems like a good trade-off for this application. -- -keith
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