Practice with FUNcube telemetry data
To download the satellite data, copy this link to your browser:
Click the links that marked in the figure below:
Create a new Excel file, and load the .csv file into your worksheet. Plot the time as the X axis and the 'Solar Panel X mV' as the Y axis.
Truncate the data, just keep the first 300 data points. You can do this by change the number in the range:
The truncated data can looks like this:
satellite is running along the orbit, when it goes into the eclipse,
there is no solar power, so the voltage becomes 0; when it goes into
the bright area, the solar panel converts the solar power into
voltages. So the 'Period' of this waveform should be the time it takes
for the satellite to complete one orbit. Hover
your mouse on two points to read the time at these two points, the
differences between these two times will be the period of one orbit.
Probably the time will be around 100 min. This is typical for a Low Earth Orbit satellite.
Next, let's do a multi-plot on one graph. Add an new series by: (Use the column of 'Solar Panel +X deg C')
You will see the data looks like this:
new data is just a flat line. The reason is the two data, one is mV,
one is 'degree', they are in different units. So you want to add a new
unit (Y axis) for the new data. We can use the Y axis on the right side
of graph to fit the degree units in.
Do the following:
Now the new data starts making sense. Add the titles/legends to complete the plot:
Complete all the tasks above in ONE excel file.
Send your excel file to email@example.com