Download VEX design report - TOC

Ref
: VEX-T.ASTR-TCN.00349
Issue : 2
Date
: 06/02/2004
Page :
Error source
VEX simulation results
STR degradation (radiations)
STR spatial noise
STR-Payload alignment
TOTAL
X axis
0.0114
0.0014
0.0075
0.0337
0.0367
Y axis
0.0027
0.0014
0.0017
0.0337
0.0342
Rev. : 0
13.10
Z axis
0.0039
0.0014
0.0075
0.0337
0.0351
Table 13.5/1: Attitude Estimation Error budget during Nadir observation (deg, 3σ).
Error source
Attitude Pointing (VEx simulation results)
STR degradation (radiations)
STR spatial noise
STR-Payload alignment
Aspera scan mechanism
Guidance
TOTAL
X axis
0.0252
0.0014
0.0075
0.0337
0.0001
0.005
0.043
Y axis
0.0205
0.0014
0.0017
0.0337
0.0001
0.005
0.040
Z axis
0.0282
0.0014
0.0075
0.0337
0.0001
0.005
0.045
Requirement
0.0612
0.0612
0.0612
Table 13.5/2 : Pointing Error budget during Nadir observation (deg, 3σ).
Error source
Attitude estimation (VEx simulation results)
Attitude control (Vex simulations results)
STR degradation (radiations)
STR spatial noise
STR HGA alignment
Guidance
Occultation
TOTAL
No occultation
0.018
0.031
0.002
0.007
0.077
0.055
0
0.101
Occultation in GSEP
0.018
0.031
0.002
0.007
0.077
0.055
0.134
0.168
Table 13.5/3 : Pointing Error budget during Earth pointing phases (deg, 3σ).