A three-axis-oriented solar experiment package is to be mounted onto a manned orbiting spacecraft. This package would include, among others things, a 14-in. telescope, together with still-picture and television cameras. A control system is required to point the satellite to the sun, wich has a diameter of about 20 arc-minutes. It is also required to point the satellite to a position off the sun but within the observation of the sun's corona; consequently, the control system should be capable of positioning a displacement of 1º from the center of the sun. On account of the limitations of the cameras, the position must be held within 60 arc-seconds with a jitter rate of less than 1 arc-minute per minute of time.
In the discussion here, only the control of the roll axis is considered.
The next is an applet where you can experiment with the model.
(*) This example is taken from Yohan Chu, "Digital simulation of continuous systems", McGrawHill, 1969.
Last modified 23/12/99 by Juan de Lara ( Juan.Lara@ii.uam.es, http://www.ii.uam.es/~jlara) need help for using this courses?.