AGI Technology Beyond Earth Orbit

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Lunar gravity• High degree and order gravity field required–Lack of a dominant term–Missions can fly at very low altitude–Recent gravity modeling improvement• Gravity field not nearly as well known as that forthe Earth–Fit span for LS–Process noise for filtersReference: Recent Gravity Models as a Result of the Lunar Prospector MissionAGIPg 14 of 40www.agi.com
Lunar gravity process noise model• Requirement drove revisit of original gravityprocess noise algorithms by Wright• Tools for model generation were reconstructedand improved–Unique coefficients for truncation at each degree–Required data added to gravity file format–Earth gravity models will also be updatedAGIPg 15 of 40www.agi.com
Page 1 and 2: AGIAGI TechnologyBeyond Earth Orbit
Page 3 and 4: Introduction (Woodburn)• Welcome
Page 5 and 6: Current/Historical Missions (Hall)
Page 7 and 8: Recent enhancements to Astrogator(B
Page 9 and 10: Orbit determination (Woodburn)• C
Page 11 and 12: Sequential range• Ambiguous two w
Page 13: Trk-34 tracking data format• Very
Page 17 and 18: LP Position UncertaintyPosition Unc
Page 19 and 20: Central Bodies (Coppola)• Celesti
Page 21 and 22: Central Bodies (cont’d)• CB use
Page 23 and 24: CB Mu Values• Orbital element con
Page 25 and 26: Default CB Ephemeris Settings• Su
Page 27 and 28: Modifying CB ephemeris• Ephemeris
Page 29 and 30: Default Moon Attitude• Interpolat
Page 31 and 32: Attitude Reference• "Report of th
Page 33 and 34: Eclipse and Obstruction (LOS)• ST
Page 35 and 36: LTD Issues• Graphics display True
Page 37 and 38: Interplanetary Propagation (Berry)
Page 39 and 40: Future direction (Woodburn)• HPOP

AGI Technology Beyond Earth Orbit

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