the work-script for chapter 3
3.1 Power systems
talked about solar cells, the solar constant, the variation in
illumination and batteries.
Click here for animation how solar panels are deployed.
3.2 Attitude and
then focussed on the control system for keeping the satellite in a
particular orientation (attitude).
First we talked about assignment #2. Then we talked about the sources
of rotational torque. We leaned about earth, sun and
star sensors and how an eroneous attitude is corrected. We then focused on
looked at the engineering model of the RadioAstron
spacecraft. We also saw the focus cabin, the flywheels,
the gas tanks
and the gas
We discussed homework assignment #2. We
then covered issues related to the orbit control and compared
the fuel allocations for various maneuvers.
3.3 Telemetry, tracking and
We talked about the measurement of the orientation, the
environment and the health of a satellite
and how these measurements are transmitted. Then we covered
issues related to the tracking
of a satellite.
We talked about
how commands are executed.
We talked about assignment #2.
We learned about uplink and downlink and talked about
radio bands and the corresponding frequencies.
We talked about assignment #3. We interpreted the block diagram of a
We had our midterm exam.
. Then we learned about solid state amplifiers and about amplification in the
non-linear regime and
here for a different perspective.
learned about wire, horn and reflector antennas, the
radiation pattern, the 3dB-beamwidth, and the gain
of an antenna.
We talked about the degradation of the gain as a function of the
roughness of the antenna surface. Then we turned to Chapter 4.