NASA Technical Reports Server (NTRS) 20060046723: C-20A Precision Autopilot Development in Support of NASA's UAVSAR Program

6.9 MB·English

by  NASA Technical Reports Server (NTRS)

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UAVS mary objective of the UAVSA velop a miniaturized polarim e on an unmanned aerial veh & Responsibilities L •Lead center that will desig instrument, develop proce yden Flight Research Center •Manage the development •Deliver RPI interim platfor •NASA’s C-20A selecte •Lead the platform modifica platform •Develop Platform Precisio tal Aircraft Services, Inc. (TA •Under contract to perform ght of SAR on C-20A expect
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NASA DFRC’s C-2 aft Goal Provide a research test-bed for NAS agencies with a long-term capability experiments. •“Shirt sleeve” environment •Research Infrastructure first flight in December 1979 Derived from G-II which first flew in C’s G-III manufactured in early ’80s aft Dimensions Wing: span 77 ft 10 in; area 934.6 ft Fuselage and tail: length 83 ft 1 in; aft Performance Max Mach - 0.85 Max Operating altitude - 45Kft Normal cruise – 459 kts Range – 3400 nautical miles (full pa Climb – 4,049 fpm Large Internal Volume (1500 cu. Ft.)
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Platform Precision Autopilot (PPA) Primary Project Level Requirements ain flight within a 10 m (32.8ft) tube in light to calm turbulence levels. he PPA shall fly the C-20A within a 10 m (32.8 ft) diameter tube for at least 0% of each data take in conditions of light to calm atmospheric disturbance s defined in Section 4.9 of reference 3. The PPA should be able to meet th 0 m (32.8ft) diameter tube requirement in the presence of light to moderate mospherics disturbances, as defined in Section 4.9 of reference 3, but not e expense of performance in conditions of light to calm atmospheric sturbances. •Parent: This requirement is derived from P3 of Reference 1 which stat “The UAVSAR Platform shall be capable of flying 80% of all desired tracks to within a 10 m tube for at least 90% of the track”. •Reference 3 is MIL-STD-1797 Appendix A Flying Qualities of Piloted Vehicles Handbook For ize motion during data collection. he PPA shall minimize motion during SAR data runs. •Parent: Self-Imposed •Rationale: It is critical to operate the UAVSAR System on a steady platform. This requirement will be further defined and addressed throu cooperation with JPL as the PPA is developed.
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