Antenna pointing systematic error model derivations
Abstract
The pointing model used to represent and correct systematic errors for the Deep Space Network (DSN) antennas is presented. Analytical expressions are given in both azimuthelevation (azel) and hour angledeclination (hadec) mounts for RF axis collimation error, encoder offset, nonorthogonality of axes, axis plane tilt, and structural flexure due to gravity loading. While the residual pointing errors (rms) after correction appear to be within the ten percent of the halfpower beamwidth criterion commonly set for good pointing accuracy, the DSN has embarked on an extensive pointing improvement and modeling program aiming toward an order of magnitude higher pointing precision.
 Publication:

The Telecommunications and Data Acquisition Report
 Pub Date:
 February 1987
 Bibcode:
 1987tdar.nasa...36G
 Keywords:

 Antennas;
 Deep Space Network;
 Errors;
 Mathematical Models;
 Pointing Control Systems;
 Flexing;
 Fourier Analysis;
 Gravitational Effects;
 Predictions;
 Skewness;
 Stochastic Processes;
 Communications and Radar