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    Rubidium Ultra-Stable Oscillators at Titan: The Huygens Doppler Wind Experiment (1997)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The Doppler Wind Experiment (DWE) is one of six investigations to be performed during the Titan atmospheric descent of the ESA Huygens Probe. The primary scientific objective is to measure the direction and strength of Titan's zonal winds with an accuracy better than 1 m/s. The Probe's wind-induced horizontal motion will be derived from the residual Doppler shift of its S-band radio link to the Cassini Orbiter, corrected for all known orbit and propagation effects, from the beginning of the mission (altitude: approx. 160 km) down to impact on the surface. The DWE Instrumentation consists of Rb-based Ultra-Stable Oscillators used to: (1) generate the transmitted signal from the Probe and (2) extract the frequency of the received signal on the Orbiter. The capabilities of these USOs under the rugged experimental conditions on Titan and some results from the DWE pre-launch test program are described.
    Keywords: Lunar and Planetary Exploration
    Type: Proceedings of the Workshop on the Scientific Applications of Clocks in Space; 211-220; NASA/CR-97-112594
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Mars Dynamics from Earth-Based Tracking of the Mars Pathfinder Lander (1997)
    In:  Other Sources
    Details
    Publication Date: 2019-08-17
    Description: Measurements of Mars' rotational variations can be conducted via Earth-based radio tracking observations of the Mars Pathfinder lander during an extended mission. Two-way range measurements between an Earth tracking station and the lander will enable precise monitoring of the planet's orientation, allowing details of Mars' internal structure and global surface/atmosphere interactions to be determined. An analysis has been performed to investigate the accuracy with which key physical parameters of Mars can be determined using the Earth-based radio tracking measurements. Acquisition of such measurements over one Martian year should enable determination of Mars' polar moment of inertia to 1% or better, providing a strong constraint on radial density profiles (and hence on the iron content of the core and mantle) and on long-term variations of the obliquity, which influences the climate. Variations in Mars length of day and polar motion should also be detectable, and will yield information on the seasonal cycling of carbon dioxide between the atmosphere and the surface.
    Keywords: Lunar and Planetary Exploration
    Type: Paper 96JE02125 , Journal of Geophysical Research (ISSN 0148-0227); 102; E2; 4057-4064
    Format: text
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    NASA TECHNICAL REPORTS
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