Bryan Duke <[email protected]> writes: > Lazy post… so that I don’t have to dig through the code, can anyone > share roughly how the calcs are done for the max altitude reporting of > the TeleMetrum on the AltosUI Flight Statistics tab (like the attached > image from an EasyMini flight)? Does the GPS altitude get a heavier > weight than the baro?
The max height is just the max baro height; we also report the max GPS height separately. > I’m thinking about buying a TeleMetrum for J & K record attempts next > month. Since my launch location will likely be about 50 deg F above > standard day, I’m expecting the pressure altitude to be 1000+ ft off > from geometric altitude for the 26-33k AGL altitudes I’m hoping to > hit. I know the baros have a temperature correction built in, but with > the actual atmosphere much hotter than standard day plus the inside of > my black rocket being extra warm I’m don’t expect much accuracy from > the baro. While the baro sensor has compensation for the temperature, that only affects how it reports pressure data, not how the system computes altitude from that pressure. That's a smaller effect, and is partially mitigated by subtracting the computed altitude at the pad from the computed altitude at apogee. If you get a solid looking apogee curve from the GPS receiver, you should just use that for your height values and ignore the barometric height. -- -keith
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