The Stellar Reference Unit for the Europa Orbiter Mission
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Europa Orbiter Mission Stellar Reference Unit Tota↗
Engineering topics
Ratliff, J.
Publications and source records attributed to Ratliff, J..
The Stellar Reference Unit for the Europa Orbiter Mission
Star trackers are a reliable and accurate device used by almost all spacecraft in order to autonomously determine their orientation.
Europa Orbiter Star tracker↗
Clementine RRELAX SRAM Particle Spectrometer
The Clementine RRELAX radiation monitor chip consists of a p-FET total dose monitor and a 4-kbit SRAM particle spectrometer. Eight of these chips were included in the RRELAX and used to detect the passage of the Clementine (S/C) and the innerstage adapter (ISA) through the earth's radiation belts and the 21-Feb 1994 solar flare. This is the first space flight for this 1.2 micron rad-soft custom CMOS radiation monitor. This paper emphasizes results from the SRAM particle detector which showed that it a) has a detection range of five orders of magnitude relative to the 21-Feb solar flare, b) is not affected by electrons, and c) detected microflares occurring with a 26.5 day period.
Clementine↗