Steve Rawson

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Twenty-six subsurface samples were collected from a borehole at depths of 173.3 to 196.8 m in the saturated zone at the Hanford Site in south-central Washington State. The sampling was performed throughout strata that included fine-grained lacustrine (lake) sediments, a paleosol (buried soil) sequence, and coarse-grained fluvial (river) sediments. A(More)
Space communications between distant spacecraft and the Earth are mainly based on large reflector antennas, such as the 35-m Deep-Space Antennas of the European Space Agency. These provide the required G T and EIRP to existing missions, such as, for example, Rosetta, Mars Express, and Venus Express. However, future missions to Mars and to outer planets(More)
This paper presents the results of an architectural study into future ESA Deep-Space ground stations. The objective of the project is to investigate solutions for building ground stations for future Deep Space missions for exploration of the outer reaches of the solar system. The study addresses not only the engineering challenges associated with various(More)
This paper presents the preliminary studies and results for ground stations to be used to control multi-satellite missions, such as the next generation of METEOSAT satellites, without any kind of mechanical or electric beam steering. The most important draft specifications driving the design of these ground stations will be discussed in detail, highlighting(More)
Receivers for radio-astronomical applications, in particular for very long baseline interferometry techniques, where a metal feed is often used to illuminate a reflector antenna, usually operates over wide bandwidths and cooled to low temperatures. In particular, the possibility of cooling not only the low noise amplifier, but also the entire feed is(More)
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