Rheinisches Institut für Umweltforschung RIU Abt. Planetare Forschung

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Presentation transcript:

Rheinisches Institut für Umweltforschung RIU Abt. Planetare Forschung Rosetta Radio Science Investigations (RSI) Martin Pätzold, Silvia Tellmann Rheinisches Institut für Umweltforschung RIU Abt. Planetare Forschung Universität zu Köln B. Häusler Institut für Raumfahrttechnik, Universität der Bundeswehr München, Germany

Team Status & Recent Activities No changes RSI activities since last SWT: PC9 09.02.2009 Purpose: check the stability of the USO

Reconstructed Transmitted USO Frequencies Switch OFF of USO

Passive Checkout 9

RSI PC9 Measurement Overview ONED-TCXO ONED-USO ONED-TCXO TWOD-X

RSI PC9 Measurement Overview ONED-USO ONED-TCXO TWOD-X

USO measurement: First part End of noisy measurement part Start of USO measurement

USO measurement: First part End of noisy measurement part Start of USO measurement

Noisy Measurement Part: Residual & AGC Signal Level (AGC)

Comparison with typical residual 35 Hz Residual Typical Residual 50 mHz

End of Noisy Measurement Part Residual 3dBm Signal Level (AGC) End of noisy measurement part

End of Noisy Measurement Part (Zoomed in) Residual Signal Level (AGC) End of noisy measurement part

Remaining USO Measurement: Residual Signal Level (AGC) 8dBm TM OFF

Summary Passive Checkout 9 First ~750 s of USO measurement show several frequency jumps Explanation: False Lock on Transponder 2

TM: Transponder 2 RX DC Current

TM: Transponder 2 RX DC Current

Summary Passive Checkout 9 First ~750 s of USO measurement show several frequency jumps Explanation: False Lock on Transponder 2 Happens at start of measurement Lasts for a few minutes Remaining USO measurement as expected! USO behaves quite well!