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The Huygens Doppler Wind Experiment is designed to determine the velocity of Titan's zonal winds. The wind is measured over a height range from 0 - 160 km from its Doppler signature on the Probe's radio relay signal to the Cassini Orbiter. The stringent frequency stability required for the DWE measurement is assured by (a) generating the transmitted signal with a externally supplied ultrastable oscillator (TUSO), and (b) providing the receiver with an identical ultrastable external oscillator (RUSO). Information on probe dynamics (spin rate, spin phase, parachute swing) and large-scale turbulence in the Titan atmosphere are secondary objectives of the investigation. The reconstructed probe trajectory using DWE data provides the best estimate of Huygens' final place of rest on Titan.


This paper presents results of a research project partially funded by the Deutsche Agentur für Raumfahrtangelegenheiten (DARA) GmbH under contract 50 OH 9207. The responsibility for the contents is assumed by the authors.


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