... The tracking (i.e. unguided) performance of the United Kingdom Infra-Red Telescope (UKIRT) relies on the accuracy of its 24 bit absolute encoders. These have been long known to generate two systematic errors. The first is a periodic error resulting from the encoder deriving the last 8 resolution bits by interpolation between the rulings on its code disk. ... To estimate the measurement errors we introduce a periodic filter to model and a Kalman filter to model . ...

. Wright: Today is February 28th, 2006. This oral history session with Charles F. ?Chuck? Deiterich is being conducted in Bertram, Texas, for the NASA Johnson Space Center Oral History Project. Interviewer is Rebecca Wright, assisted by Jennifer Ross-Nazzal and Sandra Johnson. Thanks again for participating in this project and letting us come visit you when you?re home this afternoon. We?d like to start with you sharing with us what motivated you to apply for a position at the Manned Spacecraft Center in

... Reports on progress and error are always recorded in the log file of the program. ... UT date of the measurement finish in YYYY-MM-DD format UT time of the measurement finish in hh:mm:ss format Average flux in A aperture Average flux in B aperture Average flux in C aperture Average flux in D aperture Normalized variance of flux in A aperture Normalized variance of flux in B aperture Normalized variance of flux in C aperture Normalized variance of flux in D ...