Julian J. W. Wilson

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The liquid cloud and rain particles cannot produce the enhanced delay, because the precipitating clouds would have to be more than 21 km deep to account for the maximum observed delay of 64 mm. The observed features in the interferogram illustrate how localized areas with an increased water vapor content may give an indication for the occurrence and(More)
The location of the Opportunity landing site was determined to better than 10-m absolute accuracy from analyses of radio tracking data. We determined Rover locations during traverses with an error as small as several centimeters using engineering telemetry and overlapping images. Topographic profiles generated from rover data show that the plains are very(More)
The precise location and relative elevation of Spirit during its traverses from the Columbia Memorial station to Bonneville crater were determined with bundle-adjusted retrievals from rover wheel turns, suspension and tilt angles, and overlapping images. Physical properties experiments show a decrease of 0.2% per Mars solar day in solar cell output(More)
[1] The Mars Phoenix Lander was equipped with a 2.4 m Robotic Arm (RA) with an Icy Soil Acquisition Device capable of excavating trenches in soil deposits, grooming hard icy soil surfaces with a scraper blade, and acquiring icy soil samples using a rasp tool. A camera capable of imaging the scoop interior and a thermal and electrical conductivity probe were(More)
During the development programme, it was determined that the Advanced Scatterometer Radar, now embarked on METOP-A could not meet its stringent radiometric requirements without regular, accurate, calibration. It was not believed that the stability requirements of 0.2dB or better could be met by natural sources such as rain forest or simple corner(More)