January 3, 2006
ALMA Prototype Antenna Evaluation OverviewEvaluation Overview
22
Pointing Performance Summary
Offset
Absolute
Offset
Absolute
0.94±0.26 (spread) ±0.05 (extrapolation) ±0.20 (wind)
É
0.50±0.13 (spread) ±0.02 (extrapolation) ±0.11 (wind)
É
Accelerometer (15 min)
0.58±0.15 (spread) ±0.08 (wind)
É
0.29±0.09 (spread) ±0.05 (wind)
É
Accelerometer (10 sec)
<0.9
<4
<0.5
<4
Radiometric
0.3-1.1
1.3-1.8
0.3-0.8
2.0-2.6
Optical
VertexRSI (arcsec)
AEC (arcsec)
System/Technique
Spread = measurement spread, Extrapolation = wind power spectrum extrapolation uncertainty, Wind = Wind power spectrum uncertainty.