Note that it can take some time (over a minute or two in some cases) to download the detail data,
because of the “on-the-fly” formatting. When you’re downloading the data, the little blue LED on
the WiFi module next to the antenna will blink… that’s a sign that it’s working.
We’ve had good luck with WPS Office for Android and iOS, it’s free and works very well with the
simple .csv data that the Quasar sends out, and it’s very easy to get a flight/event graph. For a
Windows laptop, we use Excel, but any data analysis program that can take a .csv file will work.
Each entry in the flight detail file looks like this, of course there’s a comma between each field…
T (time) – Seconds from Launch Detect
Alt (altitude) – the RAW pressure-derived altitude value from the altimeter
FAlt (filtered altitude) – the FILTERED pressure-derived altitude value. This is the filtered value
that we use for altitude-dependent events on ascent, such as the airstart minimum altitude.
FVeloc (filtered velocity) – the FILTERED velocity for that sample. This is the same calculation
that we use for velocity-dependent things on ascent like the airstart minimum velocity.
Following that data are the events. Event data is ZERO unless the sample triggers the event, in
which case it’s the RAW altitude data, since these events theoretically should occur at a relatively
low velocity (sub-mach transition). This format causes a scatter graph of the data to show a little
spike where the event occurs, which is a very easy and convenient way of viewing where the event
occurred.
LDA – Non-zero at the sample when the LDA altitude is first exceeded
LowV – Non-zero at the sample when the low velocity threshold (< 100 ft/sec for 1 second) is
reached
Apogee – Non-zero at the sample when apogee is reached
N-O – Non-zero at the sample when Nose-Over is reached, typically one second past apogee
Drogue – Non-zero at the sample when the Drogue is first triggered
Main – Non-zero at the sample when the Main is first triggered
Due to the many programs that can be used to view/manipulate this data, we’re not going to go into
what you should do to graph/view it… we recommend that you check the documentation for your
data analysis program for that information.
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