SOHO Mission Halo Orbit Recovery from the Attitude SOHO任务的晕轨道恢复从态度ppt课件.pptVIP

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SOHO Mission Halo Orbit Recovery from the Attitude SOHO任务的晕轨道恢复从态度ppt课件.ppt

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SOHO Mission Halo Orbit Recovery from the Attitude SOHO任务的晕轨道恢复从态度ppt课件

The SOHO Mission Halo Orbit Recovery from the Attitude Control Anomalies of 1998Craig E. RobertsComputer Sciences CorporationFlight Dynamics FacilityGoddard Space Flight Center;Contents;Solar Heliospheric Observatory (SOHO) Spacecraft;SOHO Mission Overview;SOHO’s Halo: View from NEP;SOHO’s Class 2 Halo: Side View;SOHO’s Halo: Looking Sunward from Earth;SOHO Halo Orbit Stationkeeping Technique;Stationkeeping Realities;Stationkeeping Realities, Part 2: ESRs;Post-ESR Recovery;The June 25, 1998 Disaster;Disaster’s Impact on Trajectory;Early Assessment;Six Possible Escape Trajectories to Solar Orbit for +1 cm/sec Dispersions (+1 to +5 cm/sec) from Telemetry Dropout Case, or TDC;Post-Escape 11.6 Year Heliocentric Earth-Return Trajectoryfor the TDC Case (Solar Rotating Frame);Escape Trajectories for other possible small dispersions:from TDC ?1 cm/sec to TDC ?6 cm/sec;First Dispersion Case (TDC – 7 cm/sec) with Fall-back to Earthwith Temporary Capture and Eventual Escape;TDC – 8 cm/sec Dispersion Case;TDC – 9 cm/sec Dispersion case;TDC – 10 cm/sec Dispersion Case: First Capture into High-Energy, Long-Duration Chaotic Orbit with Lunar Encounters;TDC – 11 cm/sec Dispersion Case:;SOHO Recovery #1;SOHO Recovery #1, Continued;December 21, 1998: SOHO Disaster #2;SOHO Disaster #2 (continued);Orbit/Thrusting Modeling Method;ESR Delta-V Day by Day (from Doppler): Dec. 21 to Jan. 6;ESR Cumulative Delta-V (from Doppler): Dec.21 to Jan. 6;“Low Thrust” Trajectory Evaluation;Nominal Halo Shown with an Indefinite ESR Escape Trajectory, and an Un-recovered One-day ESR Event Trajectory for Comparison ;Indefinite ESR Escape Trajectory, and Guided Continuous Thrust Trajectory through fuel exhaustion and fallback with Earth Capture;SOHO Recovery #2 Maneuvers;SOHO Recovery #2: Complicating Factors;SOHO Recovery Maneuver History;Conclusion: How Was It Done?