Aerocapture Technology - 123SeminarsOnly

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Characterizing Atmospheric Uncertainties Variability We Can Model (season, latitude, etc.) Measurement Uncertainty (Big improvement for Titan after Huygens/Cassini) Residual Uncertainty (Monte-Carlo-modeled waves, turbulence, etc.) Neptune Titan Titan Mars Earth 0 10 20 30 40 50 60 70 Variation, % of Mean Post Cassini / Huygens Density Variation, % of Mean (at <strong>Aerocapture</strong> altitudes) • Residual uncertainty about the same for Mars and Titan; higher for Neptune • Titan’s overall variation roughly same as Earth, after Cassini/Huygens 8
Trajectory Simulations Include Realistic Global Reference Atmosphere Models Global Reference Atmosphere Models (GRAM) • Provides atmosphere parameters (density, pressure, temperature) vs. altitude, latitude, longitude, season, and time of day • Earth GRAM used for Space Shuttle, Genesis, Stardust • Mars GRAM used for Pathfinder, MER, MGS, Odyssey, MRO, MSL • Titan, Neptune, Venus GRAM modeled using same approach as Mars GRAM • Titan GRAM profiles validated against Cassini/Huygens measurements Models include variability and random perturbations for Monte Carlo trajectory analysis • Includes uncertainties in current estimates derived from scientific measurements • Includes perturbations based on models of dynamic processes 2000 Perturbed Density Profiles from Mars GRAM Aerobraking Altitudes <strong>Aerocapture</strong> Altitudes 9
Page 1 and 2: Aerocapture Technology www.nasa.gov
Page 3 and 4: Atmospheric Drag Reduces Orbit Peri
Page 5 and 6: Aerocapture’s Advantages to Scien
Page 7: Titan Aerocapture Systems Study Con
Page 11 and 12: ! ! ! ! ! ! ! Titan Aerocapture Tec
Page 13 and 14: Example Monte Carlo Simulation Resu
Page 15 and 16: Total Heat Load (kJ/cm 2 ) 1.6 1.4
Page 17 and 18: ISPT’s Low-Risk Aeroshell Mass Im
Page 19 and 20: Power Supply Command & Telemetry Pr
Page 21 and 22: Destination Subsystem Atmosphere Go
Page 23 and 24: Resource Estimates for Aerocapture
Page 25: Aerocapture Development Summary •

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