Space telescope alternate fine guidance sensor performance
Abstract
Simulated performance results of an alternate fine guidance sensor for the Space Telescope fine guidance system (FGS) are presented. The system performance of the present sensor which utilizes a Koester's Prism Interferometer, is compared with the system performance with an elecrostatically focused quadrant digicon (EFQD) for several scenarios. The expected baseline performance of the pointing control system when utilizing both of these sensor systems is presented. The effects of cosmic ray environments, scientific instrument induced torques on the telescope and thermal induced boresight shifts upon the pointing performance of the telescope are also reported. A conceptual design for an acquisition sequence controller for a generic quadrant detector fine guidance sensor is included along with simulated acquisition performance using an EFQD sensor. Use of the EFQD sensor facilitates a simple and very robust acquisition sequence controller which can acquire the guide star for hand-over to either the fine lock, or fine modes, in less than 2 seconds.
- Publication:
-
Guidance and Control Conference
- Pub Date:
- 1984
- Bibcode:
- 1984guco.conf..655S
- Keywords:
-
- Guidance Sensors;
- Hubble Space Telescope;
- Spacecraft Control;
- Systems Simulation;
- Algorithms;
- Feedback Control;
- Interferometers;
- Sensitivity;
- Astronomy