For any two-axis “gimbal” mount, the basic a priori model consists of seven terms: two encoder index errors, two non-perpendicularities, two azimuth-axis tilt components, and Hooke’s Law ﬂexure.
Evaluation of the ALMA Prototype Antennas
The mean radiometrically-inferred (solid black) and mean azimuth (cyan dashed) and elevation (purple dashed) encoder pointing errors as a function of time since the start of the 1.5 deg fast switching slew are shown.
Evaluation of the ALMA Prototype Antennas
Azimuth encoder errors were converted to cross-elevation errors through multiplication with the cosine of the elevation.
Study of the Dynamics of Large Reflector Antennas with Accelerometers
For analysis of the antenna pointing and the understanding of the pointing model it is useful to know which part of the azimuth axis pointing error is due to the azimuth bearing.
Mechanical Measurements of the ALMA Prototype Antennas
In the speciﬁc example of the observation of the disk around AB Aur by AEOS telescope (Oppenheimer et al. 2008), Jang-Condell and Kuchner (2010) estimate that the error is typically at the level of ∼ 20% by ﬁtting the intrinsic azimuthal variation by a certain ﬁtting function and by calculating the rms deviation.
The Structure of a Self-Gravitating Protoplanetary Disk and its Implications to Direct Imaging Observations
Although the initial phase when the error induced by GLS rises more steeply than that of ODE87 is also present, it turns over very quickly and for l & 5 × 103 (≈ 50 azimuthal revolutions) the GLS turns out to be more accurate.
Transition from regular to chaotic motion in black hole magnetospheres
For a long time the anisotropic ﬂow measurements suffered large systematic errors related to the so called “non-ﬂow” contribution, the contribution due to the azimuthal correlations not related to the orientation of the reaction plane.
Anisotropic flow
Figure 9: Statistical error on the determination of the azimuthal angle ∆φ, as explained in the text, for H → W W and H → Z Z .
Physics at a gamma gamma, e gamma and e-e- Option for a Linear Collider
The shown error bars in ﬁgs.5, 6 and 7 refer to the special case of Sivers asymmetry, however they are the same for any kind of left/right asymmetry with respect to a CollinsSoper azimuthal angle φ.
Cross sections, error bars and event distributions in simulated Drell-Yan azimuthal asymmetry measurements
It is vital to carefully investigate the systematic errors, in particular due to non-perfect azimuthal acceptance, as well as to review the applicability of different methods in this respect.
Effects of non-uniform acceptance in anisotropic flow measurement
A2 Tracking errors Tracking errors in PhoSim are modeled by a Gaussian random walk of the telescope pointing in each of the three directions: azimuth, elevation and rotation, where a step is taken every 0.1 second throughout the exposure.
Spurious Shear in Weak Lensing with LSST
The effect of the tracking error integrated over 15 seconds is to yield a root-mean-squared (RMS) error of ∼ 0.02" in the azimuth and elevation directions, and ∼ 1" in rotation.
Spurious Shear in Weak Lensing with LSST
To improve the statistical error, and to reduce certain systematic errors, the detector is arranged to cover all or most of the range in azimuthal angle.
Parity Violation and the Nucleon-Nucleon System
FIGURE 9: Azimuthally averaged PSF obtained with a 0.5 mm mercury layer for the complete mirror, the mirror with a diaphragm that excludes the outer 12% of the radius, as well as the complete mirror with a 0.41" leveling error.
Optical Tests of a 2.5-m diameter Liquid Mirror: Behavior under External Perturbations and Scattered Light Measurements
For the same set of parameters, we have also found (results not shown) that the errors are slowly varying function of the azimuthal angle φ.
Optical response of supported particles
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