The MMS SPIAT contract funded by ESA under the ASTP allowed MMS to demonstrate both inertial and optical angular sensors having accuracies of the order of 20nrad rms. For test environment assessment a larger version of the inertial sensor was built having a theoretical noise level of 3nrad rms equivalent. Due to environmental noise the sensor was never able to demonstrate this very small noise level. In the development reported in this paper, the output of such a sensor is passed to an equivalent low-noise actuator, both sensor and actuator being mounted on a passive, low-torque motion table. In this way the assembly can become a single-axis isolation mount enabling very low levels of angular noise to be both measured and controlled. A second similar sensor can be arranged to give a truly independent measure of angular noise so verifying both the low noise of the second sensor and the low noise achieved in the loop controlling the mounting of this sensor. The apparatus is described and some preliminary results are reported.
Towards GAIA: a ground demonstration of nanorad sensing and control
1997
9 Seiten, 8 Bilder, 6 Quellen
Conference paper
English
Towards GALA: A Ground Demonstration of Nanoradian Sensing and Control
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