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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
MOREReview of Requirements

L. Iess


With WVR

Dish deformations

not included


Proposed configuration of the onboard radio system
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


Plasma noise cancellation
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


Cancellation of plasma noise with a multifrequency link

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]


Cancellation of plasma noise cont
Cancellation of plasma noise (cont.)

Conclusion:

The Ka/Ka link provides the crucial observable and needs the highest accuracy.


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