Large microwave antennas have become increasingly important for radio astronomy and satellite tracking. A large antenna with
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where Ï = 0.707 and wn = 15. The transfer function of the power amplifier is approximately
where Ñ = 0.15 second.
(a) Determine the sensitivity of the system to a change of the parameter ka.
(b) The system is subjected to a disturbance Td(s) = 10/s. Determine the required magnitude of ka in order to maintain the steady-state error of the system less than 0.10° when the input R(s) is zero.
(c) Determine the error of the system when subjected to a disturbance Td(s) = 10/s when it is operating as an open-loop system (ks = 0) with R(s) = 0.
Figure P4.5
Antenna control system.
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