Ground-based tracking of the Huygens Probe during the Titan descent

Details Ground-based tracking of the Huygens Probe during the Titan descent Ground-based tracking of the Huygens Probe during the Titan descent

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.544..191f&link_type=abstract

In: Proceedings of the International Workshop Planetary Probe Atmospheric Entry and Descent Trajectory Analysis and Science, 6-9

Computer Science

3

Titan Atmosphere, Entry Probes, Huygens

Scientific paper

The radio signal from the Huygens Probe will be received using radio tracking stations on Earth as it descends through the atmosphere of Titan. The recording will be used to determine the Doppler shift of the signal and hence the velocity of the Probe in the direction of Earth. These velocity measurements will be used to determine the Titan wind speed as a function of altitude, thereby complementing the Huygens signal measurements on the Cassini Orbiter (DWE - Doppler Wind Experiment), which yield a velocity measurement in a different direction. The combined measurements will provide confirmation of the basic wind profile and most probably allow a separation of the wind speed into its meridional and zonal components. The signal strength received at Earth from Huygens will be comparable to that from a similar experiment performed with the Galileo Probe at Jupiter, and will thus probably be too weak to detect in real time because of the modulation by the (then) unknown telemetry. Instead, wide-band recordings of the Probe signal will be made throughout the three-hour descent. After the Probe telemetry is relayed from Cassini to Earth, the recorded signal is processed against a telemetry template, enabling signal integration over several seconds for determining the Probe frequency. Technical aspects and some anticipated results of the Earth-based DWE are presented.

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