SMOV Morning Meeting
Pointing Control System
May 27, 2009
May 27, 2009
P. 1
PCS Performance
•
Evaluation of vehicle jitter continues
− Investigation closing in on G3
− 16.5 Hz frequency appears to be cause of increased jitter
» 6 mas observed, 2-3 mas expected
•
s
Ops Request #18454 executed to dcollect 2 intervals of PN format data
n
o
− High rate data for all 6 gyros, as opposed
to 3 in HN
•
Looking forward, initial thoughts
− Gyro Calibration
» No impact
− VDT #3
c
e
s
- 7
c
r
a
- 6
i
l
l 5
i
m
» If G3 confirmed, prefer to remove
it from control law prior to VDT
,
» Masks other structural modes
r
e
near 16 Hz
t
» Lower jitter expected without it
t
− Vendor assessment
− Long term mitigation
i
J
60 Second RMS Jitter, Actual and 14 Hz Pass Filtered
Actual
High Pass
Low Pass
4
3
2
» May be possible with notch filter
1
May 27, 2009
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Time, seconds since 2009.146 17:50:00.009
1200
P. 2