Hi all,
for a group project I'm looking for a backup altimeter for drogue
deployment. Preferably, it should be small enough to be mounted
horizontally within 68mm diameter. It also shouldn'trequire a vertical
orientation for operation - which, If I understand this correctly, is
the case for the bigger, accelerometer based, Altus Metrum devices.
If the rocket performs as hoped, the upper stage's altitude will exceed
the maximum altitude where the MS5607 is usable, so I thought about
using timer based deployment. On the other hand, if the upper stage
doesn't ignite, apogee detection would be desirable.
I thought about configuring it as follows (two ematches, same charge)
Channel 1: altitude > some_threshold && time > xx
Channel 2: altitude < some_threshold && descending
The plan is to select some_threshold slightly above the expected
altitude in case of a non-ignition of the the upper stage motor and well
below were we'd expect sensor noise to be significant in relation to
static pressure.
Does this approach seem viable? Is there something that we'd need to be
aware of with regards to the behavior of the sensor or Kalman filter
when flying beyond ~100kft?
Thanks,
Reinhard
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