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An Augmentation of G-Guidance AlgorithmsThe original G-Guidance algorithm provided an autonomous guidance and control policy for small-body proximity operations that took into account uncertainty and dynamics disturbances. However, there was a lack of robustness in regards to object proximity while in autonomous mode. The modified GGuidance algorithm was augmented with a second operational mode that allows switching into a safety hover mode. This will cause a spacecraft to hover in place until a mission-planning algorithm can compute a safe new trajectory. No state or control constraints are violated. When a new, feasible state trajectory is calculated, the spacecraft will return to standard mode and maneuver toward the target. The main goal of this augmentation is to protect the spacecraft in the event that a landing surface or obstacle is closer or further than anticipated. The algorithm can be used for the mitigation of any unexpected trajectory or state changes that occur during standard mode operations
Document ID
20110003019
Acquisition Source
Jet Propulsion Laboratory
Document Type
Other - NASA Tech Brief
External Source(s)
http://www.techbriefs.com/component/content/article/9030
Authors
Carson, John M. III (California Inst. of Tech. Pasadena, CA, United States)
Acikmese, Behcet (California Inst. of Tech. Pasadena, CA, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2011
Publication Information
Publication: NASA Tech Briefs, January 2011
Subject Category
Man/System Technology And Life Support
Report/Patent Number
NPO-46452
Distribution Limits
Public
Copyright
Public Use Permitted.

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IDRelationTitle20110002982Collected WorksNASA Tech Briefs, January 2011
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