Rubidium Ultra-Stable Oscillators at Titan: The Huygens Doppler Wind Experiment

Details Rubidium Ultra-Stable Oscillators at Titan: The Huygens Doppler Wind Experiment Rubidium Ultra-Stable Oscillators at Titan: The Huygens Doppler Wind Experiment

Aug 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997sacs.work..211b&link_type=abstract

Proceedings of the Workshop on the Scientific Applications of Clocks in Space, p. 211

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Applications

Rubidium, Oscillators, Stability, Titan, Doppler Effect, Ultrahigh Frequencies, Space Probes, Mariner Mark 2 Spacecraft, Launching, Huygens Probe, Extraction, European Space Agency, Descent, Cassini Mission

Scientific paper

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.

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