Abstract
This article develops and compares three wind models that are used
to simulate antenna servo errors. The first model represents wind
forces acting on the antenna dish, and it closely represents actual
wind action. The second model represents wind gusts as torque disturbances
applied to the antenna drives. The third model represents gusts acting
at the antenna rate input. A wind filter introduced in this article
makes the wind gusts of the third model equivalent to the gusts of
the second model. The third model is of recent interest, since it
is applicable to the currently developed models of the antenna closed-loop
systems. Simulink models of the 34-m and 70-m antennasâ closed-loop
systems were developed to simulate antenna servo errors in wind gusts.
The article shows that for the 34-m and 70-m antennas all three models
give similar results, and that the results are comparable to the
field measurements of the servo errors taken in wind.
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