Edward Wilson

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Previous research has established that clinical anxiety patients and nonclinical populations with high levels of anxiety vulnerability characteristically orient attention toward moderately threatening stimuli. In contrast, populations with low levels of anxiety vulnerability typically orient attention away from such stimuli. The differing experimental(More)
Spacecraft control, state estimation, and fault-detection-and-isolation systems are affected by unknown variations in the vehicle mass properties. It is often difficult to accurately measure inertia terms on the ground, and mass properties can change on-orbit as fuel is expended, the configuration changes, or payloads are added or removed. Recursive least(More)
When building smaller, less expensive spacecraft, there is a need for intelligent fault tolerance vs. increased hardware redundancy. If fault tolerance can be achieved using existing essential navigation sensors, cost and vehicle complexity can be reduced. A maximum-likelihood-based approach to thruster fault detection and identification (FDI) for(More)
An automatic fringe tracking system has been developed and implemented at the Infrared Optical Telescope Array (IOTA). In testing during May 2002, the system successfully minimized the optical path differences (OPDs) for all three baselines at IOTA. Based on sliding window discrete Fourier transform (DFT) calculations that were optimized for computational(More)
An automatic interferometer fringe tracking system has been developed, implemented, and tested at the Infrared Optical Telescope Array (IOTA) observatory at Mt. Hopkins, Arizona. The system can minimize the optical path differences (OPDs) for all three baselines of the Michelson stellar interferometer at IOTA. Based on sliding window discrete Fourier(More)
Many software development tasks centered on training and operations for spaceflight have common aspects. Software engineers and researchers working in these areas stand to benefit from a software framework that can provide frequently used components. Preliminary results from the development of such a framework are presented in this paper. It is hoped that(More)
A new algorithm, multiple concurrent recursive least squares (MCRLS) is developed for parameter estimation in a system having a set of governing equations describing its behavior that cannot be manipulated into a form allowing (direct) linear regression of the unknown parameters. In this algorithm, the single nonlinear problem is segmented into two or more(More)
This paper will present recent advances in algorithms developed to achieve accurate on-line ID. These algorithms use and reference the MCRLS ID algorithm [1]. Initial mass-property ID algorithms as developed for the X-38 v.201 spacecraft and Mini-AERCam [2] are updated and extended here. Experimental results validating a subset of these algorithms on the(More)
The Smart Systems Research Laboratory (SSRL) at the NASA Ames Research Center has developed an Intelligent Virtual Station (IVS) prototype for the International Space Station. The IVS addresses major challenges faced by astronauts, mission controllers, and engineers such as efficiently managing large amounts of information. It also targets certain(More)