Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8518c&link_type=abstract
HST Proposal ID #8518
Computer Science
Hst Proposal Id #8518
Scientific paper
The Vehicle Disturbance Test {VDT} is used to characterize the HST dynamic response due to environmental disturbances during extended gyro hold intervals. Disturbances are caused by on-board mechanism motion and transient effects resulting from thermal strain. These disturbances excite the natural modes of HST structural appendages and produce vehicle dynamic response as measured by the rate gyros. Disturbance signatures are compared with signatures taken after previous servicing missions to identify changes in mechanisms or structures since the last VDT. The disturbances observed will be used as the nominal on-orbit disturbances in pointing control simulations until the next VDT is run. At least 5 orbits at +V3 sunpoint {with 90-degree solar array angle} and 3 orbits at -V1 sunpoint {with 0-degree solar array angle} are required for this test. Using two different solar array orientations allows additional identification of disturbances induced by the solar arrays. Low bandwidth attitude control gains are used to configure the HST for "nearly open-loop" dynamic response during the test. This configuration allows observation of HST disturbance response that is nearly independent of the affects of the pointing control law. No science instruments are used during this test.
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