I processed the pressure data recorded by the RDAS using a third order Kalman filter. This filter uses a constant acceleration model of the vehicles flight combined with the pressure and acceleration data to estimate the position (altitude), velocity, and acceleration of the rocket.
The Kalman filter program processes the exported interpreted data from the RDAS program and outputs another text file with all of the data. I then used GNUPlot to create the plots.
The first plot shows the altitude from just before liftoff till after apogee. The noisy green line is the unfiltered altitude data from the RDAS data file. The blue line is the filtered data.
The next plot is of the velocity estimate from the Kalman filter.
