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MORE Review of Requirements

MORE Review of Requirements. L. Iess. With WVR. Dish deformations not included. Proposed configuration of the onboard radio system. DST. XTWTA. 8.4 GHz. 7.2 GHz. KaTWTA. 32.5 GHz. MORE. KAT+SSA. 34.3 GHz. 32.5 GHz. X Ka. X Ka.

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MORE Review of Requirements

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  1. MOREReview of Requirements L. Iess

  2. With WVR Dish deformations not included

  3. Proposed configuration of the onboard radio system DST XTWTA 8.4 GHz 7.2 GHz KaTWTA 32.5 GHz MORE KAT+SSA 34.3 GHz 32.5 GHz X Ka X Ka • No intermodulation, larger output power, larger data rate • Simpler testing procedures • Onboard range delay calibration • Simpler interfaces Target accuracy: Df/f = 10-14 at 103-104s Dr= 10 cm y(1000s)=10-141.5 micron/s 1.5 mm in 1000 s

  4. Plasma noise cancellation Multi-frequencyradio link (two-way) Target accuracy: Df/f = 10-14 at 103-104s Dr= 10 cm y=10-14 is equivalent to a one-way range rate of 1.5 micron/s The corresponding one-way displacement in 1000 s is 1.5 mm X Ka X Ka DST XSSA 8.4 GHz 7.2 GHz KAT KaTWTA 34.3 GHz 32.5 GHz Original configuration – MORE EID-B

  5. X/X Doppler/range observable X/Ka Doppler/range observable Ka/Ka Doppler/range observable • Three unknown quantities: • non-dispersive term ( ) • uplink plasma ( ) • downlink plasma ( ) Cancellation of plasma noise with a multifrequency link [Bertotti, Comoretto, Iess, 1993]

  6. Cancellation of plasma noise (cont.) Conclusion: The Ka/Ka link provides the crucial observable and needs the highest accuracy.

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