Timothy Carrico (Analytical Graphics, Inc.), Travis Langster (Analytical Graphics, Inc.), John Carrico (Applied Defense Solutions), David Vallado (Center for Space Standards & Innovation), Mike Loucks (Space Exploration Engineering), Salvatore Alfano (Center for Space Standards & Innovation)
Keywords: SSA, Systems
Abstract:
The authors present several spacecraft rendezvous and close proximity maneuvering techniques modeled with a high-precision numerical integrator using full force models and closed loop control with a Fuzzy Logic intelligent controller to command the engines. The authors document and compare the maneuvers, fuel use, and other parameters. This paper presents an innovative application of an existing capability to design, simulate and analyze proximity maneuvers; already in use for operational satellites performing other maneuvers. The system has been extended to demonstrate the capability to develop closed loop control laws to maneuver spacecraft in close proximity to another, including stand-off, docking, lunar landing and other operations applicable to space situational awareness, space based surveillance, and operational satellite modeling. The fully integrated end-to-end trajectory ephemerides are available from the authors in electronic ASCII text by request.
The benefits of this system include:
A realistic physics-based simulation for the development and validation of control laws
A collaborative engineering environment for the design, development and tuning of spacecraft law parameters, sizing actuators (i.e., rocket engines), and sensor suite selection.
An accurate simulation and visualization to communicate the complexity, criticality, and risk of spacecraft operations.
A precise mathematical environment for research and development of future spacecraft maneuvering engineering tasks, operational planning and forensic analysis.
A closed loop, knowledge-based control example for proximity operations.
This proximity operations modeling and simulation environment will provide a valuable adjunct to programs in military space control, space situational awareness and civil space exploration engineering and decision making processes.
Date of Conference: September 10-14, 2006
Track: SSA Systems & Programs