Satellite broadcast communication method and system
First Claim
1. A method of broadcast communication from an earth-satellite comprising the steps of:
- providing a single antenna beam on said satellite to transmit or receive a single beam having the same signal transmitted to or received from an area on the earth'"'"'s surface, called a service area, having differing fixed margins over the service area because of average rain fade statistics;
providing said antenna with a fixed radiation pattern, said radiation pattern providing relatively increased radiation strength in areas of higher fixed margin and relatively decreased radiation strength in areas of lower fixed margin so that there is no excess fixed margin anywhere in the service area; and
transmitting or receiving said single beam signal from said fixed radiation pattern antenna to or from said service area.
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Abstract
The invention provides for the design of a single beam communication satellite system covering a single service area, either uplink, downlink or both, by which rain fade effects are totally compensated. The rain fades, characterized by fixed margins, are not exceeded for a certain percentages of time. The service area must be large enough so that the statistical rain fades (in decibels) vary significantly over the service area. The single beam antenna must be electrically large enough and must have a beam forming network capable of multiple component beams so that a gain profile can be established for the antenna which compensates for the fixed margins established over the service area. Since no subscriber has excess fixed margin this results in a minimum power system. Other significant effects such as differences in slant range and other systemic variations over the service area also can be compensated.
21 Citations
13 Claims
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1. A method of broadcast communication from an earth-satellite comprising the steps of:
providing a single antenna beam on said satellite to transmit or receive a single beam having the same signal transmitted to or received from an area on the earth'"'"'s surface, called a service area, having differing fixed margins over the service area because of average rain fade statistics;
providing said antenna with a fixed radiation pattern, said radiation pattern providing relatively increased radiation strength in areas of higher fixed margin and relatively decreased radiation strength in areas of lower fixed margin so that there is no excess fixed margin anywhere in the service area; and
transmitting or receiving said single beam signal from said fixed radiation pattern antenna to or from said service area.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of broadcast communication from an earth-satellite comprising the steps of:
- providing a single antenna beam on said satellite to transmit or receive a single beam having the same signal transmitted to or received from an area on the earth'"'"'s surface, called a service area, having differing fixed margins over the service area because of average rain fade statistics;
providing said antenna with a fixed radiation pattern based on said service area'"'"'s average rain fade statistics, said antenna radiation pattern providing relatively increased radiation strength in areas of higher fixed margin and relatively decreased radiation strength in areas of lower fixed margin so that there is no excess fixed margin anywhere in the service area; and
transmitting or receiving said single beam signal from said fixed radiation pattern antenna to or from said service area.
- providing a single antenna beam on said satellite to transmit or receive a single beam having the same signal transmitted to or received from an area on the earth'"'"'s surface, called a service area, having differing fixed margins over the service area because of average rain fade statistics;
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13. A method of broadcast communication from and to an earth-satellite, comprising the steps of:
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providing a single antenna beam on said satellite to transmit or receive a single beam having the same signal transmitted to or received from an area on the earth surface, called a surface area, having differing fixed margins over the service area in accordance with average rain fade statistics; providing said antenna with a fixed radiation pattern based on said surface areas average rain fade statistics, said antenna radiation pattern providing relatively increased radiation strength in areas of higher fixed margin and relatively decreased radiation strength in areas of lower fixed margin such that there is no excess fixed margin anywhere in the service area; transmitting or receiving a single beam signal from said fixed radiation pattern antenna to or from said service area; and arranging components forming the antenna beam forming network and components forming power amplifiers driving the antenna beam forming network such that they may be combined and arranged in more than one beam forming network signal path in order to reduce the power level of any device in the signal output paths thereby minimizing the possibility of voltage breakdown.
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Specification