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- W762604229 abstract "G-Guidance is a robust GC the addition of a fire-second approach helps to nullify velocity errors and hit desired final velocities much more precisely than the original Fire-first scheme developed in FY2005. The enhancement preserves the primary benefit of the algorithm, which is to ensure required thruster silent times during trajectory maneuvers. The fire-second scheme increases the versatility of the algorithm for missions employing G-Guidance. For instance, a landing sequence could employ the fire-second scheme to ensure a null final velocity at landing, whereas an ascent sequence could utilize a fire-first scheme to ensure there is no drift of the spacecraft toward the ground at the beginning of the maneuver. Examples are provided within to demonstrate a fire-first versus fire-second guidance scheme. As in the existing G-Guidance algorithm, the examples and schemes incorporate gravity models and thruster firing times into discrete dynamics that are solved as a optimal control problem to minimize fuel consumption or thruster energy expenditure." @default.
- W762604229 created "2016-06-24" @default.
- W762604229 creator A5016944988 @default.
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- W762604229 date "2006-08-03" @default.
- W762604229 modified "2023-09-27" @default.
- W762604229 title "Small Body GN&C Research Report: A G-Guidance Enhancement to Increase Mission Functionality" @default.
- W762604229 hasPublicationYear "2006" @default.
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