Thanks Keith. It’s great that the GPS max height is reported & graphed separately. That should work great.
-Bryan > On Apr 18, 2018, at 7:55 AM, Keith Packard <[email protected]> wrote: > > 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 _______________________________________________ altusmetrum mailing list [email protected] http://lists.gag.com/mailman/listinfo/altusmetrum
