WEBVTT

00:01.220 --> 00:02.920
Challenge 2.

00:04.720 --> 00:11.700
The satellite is spinning out of control because the Attitude Determination and Control System, ADCS, has been manipulated.

00:11.740 --> 00:13.920
We suspect sabotage.

00:13.920 --> 00:15.040
The challenge?

00:15.040 --> 00:20.280
Teams must repair the ADCS system as quickly as possible to stop the dangerous spinning.

00:20.280 --> 00:21.660
Here's how they do it.

00:21.660 --> 00:26.900
Teams may first search the provided documentation for the appropriate command to reset the ADCS.

00:26.900 --> 00:29.060
They find it and execute it.

00:29.060 --> 00:30.880
But the reset does not work.

00:30.880 --> 00:35.700
The ADCS system begins communicating again, but it is not functioning properly.

00:35.860 --> 00:41.120
Teams discover that the ADCS configuration tables have been altered and must be restored.

00:41.200 --> 00:46.500
They have to find the nominal parameters for the configuration tables from the provided user documentation.

00:46.580 --> 00:51.600
The teams then have to upload a new table to the vehicle and command the ADCS to load the table.

00:51.740 --> 00:55.440
This is how they will restore nominal operation of the ADCS.

00:55.600 --> 00:56.740
Good news!

00:56.740 --> 01:05.680
With the ADCS configuration table updated, they receive nominal status from the ADCS, but the majority of the ADCS commands still don't work.

01:05.720 --> 01:17.420
Teams realize that they can point the satellite by uploading various ADCS configuration tables each with different pointing modes and configuration parameters and loading them at different points in the orbit of the satellite.

01:17.420 --> 01:23.860
This allows the teams to stop the spin of the vehicle and point the solar arrays at the sun to charge the batteries.