Method and apparatus for mitigating interference from terrestrial broadcasts sharing the same channel with satellite broadcasts using an antenna with posterior sidelobes
First Claim
1. A terrestrially-based transmission system, comprising:
- at least one terrestrial transmitter transmitting information on at least one frequency simultaneously usable by at least one geosynchronous satellite transmitting to a satellite receive antenna having a sensitivity characterizable by a primary sensitive axis directed substantially at the satellite; and
wherein the terrestrial transmitter has an azimuthal gain characteristic directed substantially away from the Equator.
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Accused Products
Abstract
An apparatus for simultaneously receiving a first signal from a non-terrestrial source and a second signal from a terrestrial source on the same or overlapping channels using a receive antenna with posteriorly-directed sidelobes is disclosed. The apparatus comprises at least one terrestrial transmitter transmitting information on at least one frequency simultaneously usable by at least one satellite transmitting to a satellite receive antenna having a sensitivity characterizable by a primary sensitive axis directed substantially at satellite. The terrestrial transmitter includes a azimuthal gain characteristic directed substantially away from the Earth'"'"'s Equator. In an alternative embodiment, the terrestrial transmitter is disposed at a location defining a vector angularly displaced from the primary sensitive axis by an angle of less than 90 degrees. A method of transmitting information is also disclosed. In this method the information is transmitted on at least one frequency simultaneously usable by at least one satellite transmitting to a satellite receive antenna having a sensitivity characterizable by a primary sensitive axis directed substantially at the satellite and a posterior secondary sensitive axis. The method is performed by transmitting the information from a terrestrially-based transmitter to a terrestrial receive antenna in a direction substantially away from the Equator.
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Citations
16 Claims
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1. A terrestrially-based transmission system, comprising:
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at least one terrestrial transmitter transmitting information on at least one frequency simultaneously usable by at least one geosynchronous satellite transmitting to a satellite receive antenna having a sensitivity characterizable by a primary sensitive axis directed substantially at the satellite; and wherein the terrestrial transmitter has an azimuthal gain characteristic directed substantially away from the Equator. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of transmitting information on at least one frequency simultaneously usable by at least one geosynchronous satellite transmitting to a satellite receive antenna having a sensitivity characterizable by a primary sensitive axis directed substantially at the satellite and a posterior secondary sensitive axis, comprising the step of:
transmitting the information from a terrestrially-based transmitter to a terrestrial receive antenna in a direction substantially away from the Equator. - View Dependent Claims (8, 9, 10, 11)
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12. A method of receiving information transmitted on at lease one frequency simultaneously usable by at least one geosynchronous satellite transmitting to a satellite receive antenna having a sensitivity characterizable by a primary sensitive axis directed substantially at the satellite and a posterior secondary sensitive axis, comprising the step of:
receiving the information with a terrestrial receive antenna from a terrestrially-based transmitter transmitting the information in a direction substantially any from the Equator. - View Dependent Claims (13, 14, 15, 16)
Specification