Orbit Control Operations for the Cassini-Huygens Mission

Williams, P.; Gist, Emily M.; Goodson, Troy; Hahn, Yungsun; Stumpf, Paul W.; Wagner, Sean V.

doi:10.2514/6.2008-3429

Cited by 13 publications

(7 citation statements)

References 6 publications

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“…Williams, et al, discuss more details on these meetings. 3 As shown in Fig. 8, the team members lead and backup roles change after going offline.…”

Section: E Responsibilitiesmentioning

confidence: 99%

“…This arc is then used to help the Maneuver Team plan for the subsequent postencounter, clean-up maneuver. The OD deliveries of this arc during this phase allow for testing of the maneuver processes 3 and verify arc setup. Eventually, this data arc goes into operations mode where the S/C, satellite and Saturn ephemerides, maneuvers, etc are estimated on a daily basis.…”

Section: Od Team Processesmentioning

confidence: 99%

“…Williams, et al, discuss the maneuver design processes for Cassini. 3 As shown in Fig. 2, three Orbit Trim Maneuvers (OTMs) are generally planned per targeted encounter.…”

Section: A Navigation Objectivesmentioning

confidence: 99%

“…Occasionally, it is found by the Maneuver Team when there are small target errors: 1) the maneuver is too small to execute, 2) there is no substantial mission cost penalty to reduce the target miss by canceling the approach maneuver or 3) there is a overall mission cost savings to cancel the approach maneuver. 3 To overcome errors left in the trajectory, there are strategic opportunities for updating the instrument pointing vectors prior (5 days or more) to an encounter or occultation (ring or atmosphere). OD solutions with the latest data up to the 5-day requirement are delivered to support these 'live' updates.…”

Section: E Orbit Determination Requirementsmentioning

confidence: 99%

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Orbit Determination Processes for the Navigation of the Cassini-Huygens Mission

Antreasian

Ardalan²,

Beswick³

et al. 2008

SpaceOps 2008 Conference

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Deep space navigation, particularly the Orbit Determination (OD) operations of Cassini at Saturn, cannot easily be automated due to the complex dynamical environment in which the spacecraft flies; however several sub-processes are automated. The Cassini OD operations are often faced with unique challenges that require more than routine procedures. The OD Team is staffed appropriately to meet the demanding schedules and allow some level of flexibility. This paper will discuss how the OD processes are developed and the seven-member OD team is scheduled to support efficient and accurate Cassini navigation operations. Also discussed will be the requirements of the radio-metric Doppler and range tracking data acquired via the Deep Space Network and the optical navigation images of the satellites to support the daily OD operations. Furthermore, the reliability of the OD solutions, which is ensured within the framework of the OD processes, will be explained.

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“…Williams, et al, discuss more details on these meetings. 3 As shown in Fig. 8, the team members lead and backup roles change after going offline.…”

Section: E Responsibilitiesmentioning

confidence: 99%

Section: Od Team Processesmentioning

confidence: 99%

“…Williams, et al, discuss the maneuver design processes for Cassini. 3 As shown in Fig. 2, three Orbit Trim Maneuvers (OTMs) are generally planned per targeted encounter.…”

Section: A Navigation Objectivesmentioning

confidence: 99%

Section: E Orbit Determination Requirementsmentioning

confidence: 99%

See 2 more Smart Citations

Orbit Determination Processes for the Navigation of the Cassini-Huygens Mission

Antreasian

Ardalan²,

Beswick³

et al. 2008

SpaceOps 2008 Conference

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show abstract

“…During the 11 years since launch, there have been many trajectory correction maneuvers during interplanetary cruise, OTMs implemented throughout the orbital phase, and a number of canceled maneuvers [2]. Preserving the science objectives is one of the navigation team's goals, and so the decision to cancel a maneuver, implement a maneuver, or bias an encounter target has to take account science implications.…”

mentioning

confidence: 99%

Flyby Error Analysis Based on Contour Plots for Cassini Tour

Stumpf

Gist

Goodson

et al. 2009

Journal of Spacecraft and Rockets

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The maneuver cancellation analysis consists of cost contour plots employed by the Cassini maneuver team. The plots are two-dimensional linear representations of a larger six-dimensional solution to a multimaneuver, multiencounter mission at Saturn. This realization and the use of the tool itself is just one of the many significant engineering achievements that have come from the Cassini project. After inserting the cost contour capability with an enhancement (taking account of asymptote changes), a tool that was originally only used for analysis could be used for operations once the accuracy of the plots was determined to be acceptable for operations. The plots have been used extensively since the enhancement. By using contours plotted in the B plane with B R and B T components, it is possible to view the effects on V for various encounter positions in the B plane. The plot is used in operations to help determine if the approach maneuver (ensuing encounter minus three days) and/or the cleanup maneuver (ensuing encounter plus three days) can be cancelled and is a linear check of an integrated solution. The plots have also been used to bias the targets of encounters to save V. Nomenclature B = B vector or B plane B R = vertical axis of the B plane B T = horizontal axis of the B plane C3 = excess velocity or characteristic energy G x;y = grid point value on the contour plot for an approach maneuver, m=s G x;y;c = grid point value on the contour plot for a cleanup maneuver, m=s i = leg index J x;y = V calculation of a B plane grid point for an approach maneuver, m=s J x;y;c = V calculation of a B plane grid point for a cleanup maneuver, m=s K = K matrix, a maneuver capability matrix M = the B plane mapping R = R vector of the B plane r o = nominal trajectory apoapsis maneuver location S = the incoming asymptote T = T vector of the B plane T n = nth encounter of Titan V1 = the magnitude of the velocity for a cleanup maneuver, m=s V2 = the velocity magnitude for an apoapsis maneuver, m=s B A = asymptote change B plane state vector B RT = grid variation vector B xy = the variations in the B plane with a perturbed trajectory B R y = y component of grid points in the B plane B T x = x component of grid points in the B plane r = difference in the apoapsis maneuver location for a perturbed trajectory V = change in velocity, m=s V REF = change in velocity given in the reference trajectory, m=s

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The Cassini/Huygens Navigation Ground Data System: Design, Implementation, and Operations

Beswick

2019

Space Operations: Inspiring Humankind's Future

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Orbit Control Operations for the Cassini-Huygens Mission

Cited by 13 publications

References 6 publications

Orbit Determination Processes for the Navigation of the Cassini-Huygens Mission

Orbit Determination Processes for the Navigation of the Cassini-Huygens Mission

Flyby Error Analysis Based on Contour Plots for Cassini Tour

The Cassini/Huygens Navigation Ground Data System: Design, Implementation, and Operations

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