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• W2187188934 abstract "Abstract This thesis investigates the use ofCarrier-phase DifferentialGPS (CDGPS)in relativenavigation filters for formation flying spacecraft. This work analyzes the relationshipbetween the Extended Kalman Filter (EKF) design parameters and the resultingestimation accuracies, and in particular, the effect of the process and measurementnoises on the semimajor axis error. This analysis clearly demonstrates that CDGPS-based relative navigation Kalman filters yield good estimation performance withoutsatisfying the strong correlation property that previous work had associated with“good” navigation filters. Several examples are presented to show that the Kalmanfilter can be forced to create solutions with stronger correlations, but these alwaysresult in larger semimajor axis errors. These linear and nonlinear simulations alsodemonstrated the crucial role of the process noise in determining the semimajor axisknowledge. More sophisticated nonlinear models were included to reduce the propa-gation error in the estimator, but for long time steps and large separations, the EKF,which only uses a linearized covariance propagation, yielded very poor performance.In contrast, the CDGPS-based Unscented Kalman relative navigation Filter (UKF)handled the dynamic and measurement nonlinearities much better and yielded farsuperior performance than the EKF. The UKF produced good estimates for scenar-ios with long baselines and time steps for which the EKF would diverge rapidly. Ahardware-in-the-loop testbed that is compatible with the Spirent Simulator at NASAGSFC was developed to provide a very flexible and robust capability for demonstrat-ing CDGPS technologies in closed-loop. This extended previous work to implementthe decentralized relative navigation algorithms in real time.Thesis Supervisor: Jonathan P. HowTitle: Associate Professor3" @default.
• W2187188934 created "2016-06-24" @default.
• W2187188934 creator A5011665886 @default.
• W2187188934 date "2004-01-01" @default.
• W2187188934 modified "2023-09-27" @default.
• W2187188934 title "ORION-II: A True Formation Flying Mission in LEO NASA-Goddard Award #NCC5-704 Final Report" @default.
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• W2187188934 hasPublicationYear "2004" @default.
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