MORE Review of Requirements

1
MOREReview of Requirements
L. Iess
2
With WVR
Dish deformations not included
3
Proposed configuration of the onboard radio system
XTWTA
DST
8.4 GHz
7.2 GHz
KaTWTA
32.5 GHz
MORE
KATSSA
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-frequency radio link (two-way)
Target accuracy Df/f 10-14 at 103-104s Dr
10 cm
?y10-14 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
XSSA
DST
8.4 GHz
7.2 GHz
KAT
KaTWTA
34.3 GHz
32.5 GHz
Original configuration MORE EID-B
5
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.