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... modeled with noise, static bias, misorientation, misleveling, scaling and quantization errors; and the sun sensor is modeled with noise and quantization errors. All sensors are sampled at 10 Hz. Spacecraft disturbance torques ... maximum possible value without leading to numerical instability. The large initial angular error causes GEOB to reach an angular error of almost 100 deg during the first eclipse. However, for the rest ...

... are doomed to rediscover event-by-event, case-by-case, inquiryby-inquiry, accident-by-accident, error-by-error, tragedy-by-tragedy, the same litany of causative factors, the same mistakes, the same ... Risk-informed SMA Management. NASA RMC, October, 2004. Petroski, H. Design Paradigms, Case Histories of Error and Judgment in Engineering. Cambridge University Press, 1994. Mosleh, A., Rasmusen, D. M. Guidelines on ...

... (II.12b), we have \hat \omega \ = \overset\sim \omega - \hat \beta and the estimation error of the angular velocity becomes \delta \omega \ = - (\delta\beta + \eta_\upsilon), where \delta\beta ... nominal quaternion. This implies that the state dimensionality is n = 6. The conversion from error GRPs to error quaternions is fairly simple and makes use of the sigma points computed in Eqs ...

... I don't know if I ever convinced him. "It was an error." No, it was not an error, because if we hadn't had the program in there to fix it, that would have been a bad error. Fortunately, they had actually experienced this problem…in Houston several weeks before the flight, and ... time I tell people that the Apollo computer never made a mistake, never made an error, they always bring this up, "Yes, it did." '''Wright:''' George Mueller said so. Laughter '''Battin ...

... distinct advantage. This approach enables improved access time while alleviating issues associated with Doppler induced error and variations in received signal strength. 2. Virtualized Ground Station Network (VGSN) 2.1 System ... an initial filter for the VGSN to remove packets with excessive errors. I-Gate nodes that receive packets with any errors, as the protocol is zero tolerant, do not relay them to ...

... account, but it wasn’t really simulated accurately. There was a lot of trial and error. In the early, early days, we started with using a spherical Earth, just a plain ... , with the schedule pressure that you had, it was very important to catch an error, any fundamental error, very early, so that you didn’t waste a lot of effort going down ... vulnerable we really were, and how we could make mistakes. The spacecraft was filled with errors and design flaws. The tragedy was a red flag emphasizing the importance of proper procedures ...

... to navigate to a certain position. 6.9.5 Sources of Error There are a variety of sources of error in this system, the largest of which is interference caused by the ... speed is slightly, yet continuously, changed and this alters our calculated position. Clock errors are another source of error, as is the configuration of the satellite constellation when the readings were taken ...

... . And on Apollo 11, we wound up five miles off target because of the navigation errors coming around the Moon, and we didn’t mathematically model the Moon all that well ... then after that, we went to Apollo 12, and I mentioned we had a navigational error. And we had a technique that the navigation folks said, “We can give you a ... ones that called that—I don’t know if you recall. They had an error display, an error out of the guidance system during the landing. They had actually simulated that in ...

... , see. And luck comes in, too . I mean, providing you don't do anything in error . But the Mercury was not designed very good from that aspect. It work ed … It ... mean, nothing wrong with the pilots, but the pilots are just human, and they make errors and they get the wrong notions and they get tired. They even want to commit ... allowed to be set up like that by the design center (JSC) . I think another error was to have the thing organized like it was organized. The Kennedy Space Center ought ...

... . There weren’t any manual backup procedures to ensure rendezvous if the automatic system had errors in it or did not work. After flying some of these simulators, I went to ... thruster on the Gemini's own system, which would allow you to null out large errors. So as a result of that we changed the delta-H, which was the altitude ... ’re SOL. So I eliminated that by proving to the powers that be that the error that we incurred by not aligning that platform during that thirty-minute period for rendezvous ...

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