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Trajectory Dispersion Control for the Cassini Grand Finale MissionThe Cassini Grand Finale Mission, which consists of 22 ballistic orbits, will begin on April 22, 2017 after the last targeted Titan flyby. It will end on September 15, 2017 when the spacecraft dives into Saturn's atmosphere and be permanently captured. High volumes of unique science data from various onboard instruments are expected from the mission. To ensure its success and facilitate science planning, the trajectory dispersion needs to be controlled below 250 km (root-mean-square spatial deviation at the 68th percentile level) for a few segments of trajectory in the mission. This paper reports the formulation and solution of this dispersion control problem. We consider various sources of uncertainties including flyby error, orbit determination error, maneuver execution error, thruster firing control error, and uncertainty in Saturn's atmospheric model. A non-linear Monte Carlo Trajectory Dispersion tool is developed and employed for the analysis. It is found that a total of three Orbit Trim Maneuvers with a 99% (Delta)V usage of less than 2 m/s will adequately control the trajectory.
Document ID
20170007059
Acquisition Source
Jet Propulsion Laboratory
Document Type
Conference Paper
External Source(s)
Authors
Wong, Mau
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Hahn, Yungsun
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Roth, Duane
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Vaquero, Mar
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 1, 2017
Publication Date
October 19, 2015
Subject Category
Astrodynamics
Meeting Information
Meeting: International Symposium on Space Flight Dynamics (ISSFD 2015)
Location: Munich
Country: Germany
Start Date: October 19, 2015
End Date: October 23, 2015
Sponsors: Jet Propulsion Lab., California Inst. of Tech.
Distribution Limits
Public
Copyright
Other
Keywords
orbit determination
maneuver

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