[AR] Re: Flight Computer

  • From: "David W. Schultz" <david.schultz@xxxxxxxxxxxxx>
  • To: arocket@xxxxxxxxxxxxx
  • Date: Fri, 25 Dec 2015 06:51:21 -0600

On 12/24/2015 06:08 PM, KEN BIBA wrote:

In 2013, we decided to investigate more deeply about the flight dynamics
of our student payloads and designed a custom flight recorder with 3x
accelerometer + 3x gyro with a recording rate of ~1.3 kHz to examine
these dynamics. A team of our members, led by Bob Feretich, designed
and implemented the custom datalogger and post processing software
(http://www.rafresearch.com/rocketdatalogger/index.html) to implement
this data collection and analysis. A portion of the database of these
flights from 2014 can be found here
(http://www.rafresearch.com/arlissdatalogger/flightdata/ARLISS2014/index.xml)
including spectral analysis of the experienced by the payloads during
boost and deployment.


The instrumentation is flawed because the ADXL377 which is sampled at
1.3KHz has a presample filter with a corner frequency of 1.3KHz. In
other words, it has no protection at all from aliasing.

On the plus side, it does buffer the high impedance output of the
accelerometer for the ADC.


--
David W. Schultz
http://home.earthlink.net/~david.schultz
Returned for Regrooving



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