Satellite television system ground station having wideband multi-channel LNB converter/transmitter architecture utilizing a frequency stabilized common oscillator
First Claim
1. An indoor unit of a satellite television ground system comprising:
- tuning circuitry operative to simultaneously tune a first satellite television signal from a first satellite and a second satellite television signal from a second satellite, said first satellite television signal and said second satellite television signal being received from an outdoor unit of the satellite television ground system via a communications line;
first processing circuitry in communication with the tuning circuitry and operative to obtain carrier frequency offset data of one of the first and second satellite television signals;
oscillator circuitry operative to generate an oscillator signal; and
second processing circuitry in communication with the first processing circuitry and the oscillator circuitry, the second processing circuitry operative to frequency stabilize the oscillator signal utilizing the obtained carrier frequency offset data, and provide the frequency stabilized oscillator signal via said communications line to uplink circuitry and downlink circuitry of the outdoor satellite television signal unit.
5 Assignments
0 Petitions
Accused Products
Abstract
A satellite television ground system, particularly for a make or break satellite television signal system, includes an outdoor unit and an indoor unit that are in communication with each other via a single coaxial cable and an optional separate single conductor for power. The satellite television ground system is operative to measure and reverse frequency conversion errors utilizing DSP techniques, allowing for more precise generation and transmission of uplink signals from the satellite television ground system. Control data for the system is sent via a low data rate connection on a power cable thereof, or by a narrowband signaling channel via a coax cable. The system also utilizes a single reference oscillator to drive the various frequency synthesizers and the like. The satellite television ground system utilizes related oscillators for the uplink and downlink sections.
27 Citations
18 Claims
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1. An indoor unit of a satellite television ground system comprising:
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tuning circuitry operative to simultaneously tune a first satellite television signal from a first satellite and a second satellite television signal from a second satellite, said first satellite television signal and said second satellite television signal being received from an outdoor unit of the satellite television ground system via a communications line; first processing circuitry in communication with the tuning circuitry and operative to obtain carrier frequency offset data of one of the first and second satellite television signals; oscillator circuitry operative to generate an oscillator signal; and second processing circuitry in communication with the first processing circuitry and the oscillator circuitry, the second processing circuitry operative to frequency stabilize the oscillator signal utilizing the obtained carrier frequency offset data, and provide the frequency stabilized oscillator signal via said communications line to uplink circuitry and downlink circuitry of the outdoor satellite television signal unit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An indoor unit of a satellite television ground system comprising:
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means for simultaneously tuning first and second satellite television signals received from an outdoor unit of the satellite television ground system via a communications line, said first satellite television signal being received from a first satellite and said second satellite television signal being received from a second satellite; means, in communication with the means for tuning first and second satellite television signals, for obtaining carrier frequency offset data of one of the first and second satellite signals; means, in communication with the means for obtaining carrier frequency offset data, for generating an oscillator signal; and means, in communication with the means for obtaining carrier frequency offset data and the means for generating an oscillator signal, for frequency stabilizing the oscillator signal and providing the frequency-stabilized oscillator signal via said communications line to uplink circuitry and downlink circuitry of the outdoor unit. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. In an indoor unit of a satellite television ground system, a method of frequency stabilizing an oscillator signal comprising the steps of:
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simultaneously receiving a first satellite television signal and a second television signal from an outdoor unit of the satellite television ground system, said first satellite television signal being received from a first satellite and said second satellite television signal being received from a second satellite; obtaining carrier frequency offset data of one of the first and second satellite television signals; generating an uplink signal; generating an oscillator signal utilizing the carrier frequency offset data; combining the generated uplink signal with the generated oscillator signal;
providing the combined uplink signal to the outdoor unit; andproviding the oscillator signal to uplink circuitry and downlink circuitry of the outdoor unit. - View Dependent Claims (16, 17, 18)
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Specification