Digital automatic gain controller for satellite transponder
First Claim
1. A digital automatic gain controller for a satellite transponder, comprising:
- amplification means for amplifying a radio frequency signal detected by a detector diode of an output level controller by a difference between the detected radio frequency signal and a temperature compensation signal;
control means for inputting an output signal from said amplification means and outputting the inputted signal as a telemetry signal to an earth control station, said control means adjusting an output level of a radio frequency channel in response to a telecommand signal from said earth control station based on the telemetry signal; and
conversion means for converting the adjusted output level of the radio frequency channel from said control means into a drive current for driving a PIN diode attenuator of the output level controller, wherein an output of the PIN diode attenuator is amplified and inputted into the detector diode through a filter.
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Accused Products
Abstract
A digital automatic gain controller for a satellite transponder, comprising an amplification circuit for amplifying a radio frequency signal detected by a detector diode by a difference between the detected radio frequency signal and a temperature compensation signal, a microprocessor for inputting an output signal from the amplification circuit and outputting the inputted signal as a telemetry signal to the earth control station, the microprocessor adjusting an output level of a radio frequency channel in response to a telecommand signal from the earth control station based on the telemetry signal, and a conversion circuit for converting an output data signal from the microprocessor into a drive current for driving a PIN diode attenuator. According to the present invention, the digital automatic gain controller is capable of performing an automatic gain control operation flexibly and reliably on the basis of a program.
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Citations
6 Claims
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1. A digital automatic gain controller for a satellite transponder, comprising:
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amplification means for amplifying a radio frequency signal detected by a detector diode of an output level controller by a difference between the detected radio frequency signal and a temperature compensation signal; control means for inputting an output signal from said amplification means and outputting the inputted signal as a telemetry signal to an earth control station, said control means adjusting an output level of a radio frequency channel in response to a telecommand signal from said earth control station based on the telemetry signal; and conversion means for converting the adjusted output level of the radio frequency channel from said control means into a drive current for driving a PIN diode attenuator of the output level controller, wherein an output of the PIN diode attenuator is amplified and inputted into the detector diode through a filter. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification