Cassini stellar reference unit: performance test approach and results

Details Cassini stellar reference unit: performance test approach and results Cassini stellar reference unit: performance test approach and results

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2803..288t&link_type=abstract

Proc. SPIE Vol. 2803, p. 288-298, Cassini/Huygens: A Mission to the Saturnian Systems, Linda Horn; Ed.

Computer Science

Performance

Scientific paper

The Cassini Stellar Reference Unit (SRU) is the prime attitude determination sensor on the Cassini spacecraft. It must operate continuously and reliably during both the cruise and the Saturnian tour phases of the mission. In fact, accuracy requirements are most critical toward the end of the mission, during the four years of scientific observations at Saturn. To ensure that the SRU will operate within specification for the entire mission, an extensive test program has been undertaken to characterize the SRU performance prior to launch and to quantify any expected performance degradation. Results from several complimentary test programs are presented and compared with pre-test performance predictions. Additionally, a unique approach is described for enabling closed-loop testing of the SRU with the other elements of the Cassini Attitude and Articulation Control Subsystem when no optical stimulation is available.

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