MOLNIYA ORBIT SATELLITE SYSTEMS, APPARATUS, AND METHODS
First Claim
1. A system, comprising:
- a plurality of satellites, wherein each satellite of the plurality of satellites is adapted to receive uplink signals from at least one uplink hub, and to transmit downlink signals toward Earth in at least one directed beam, and wherein orbit paths of the plurality of satellites are Molniya orbits with an orbital period of about 12 hours and an angle of inclination of about 63.4 degrees, and wherein the plurality of satellites track along a common ground track, and wherein the plurality of satellites are phased in their orbits so that a first satellite enters an active orbit segment of the first satellite and initiates transmission of the downlink signals as a second satellite exits an active orbit segment of the second satellite and ceases transmission of the downlink signals, wherein an active orbit segment is centered about an apogee and has a duration of a sidereal day divided by a total number of satellites in the plurality of satellites.
1 Assignment
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Accused Products
Abstract
A system includes a satellite fleet (102, FIG. 1), in which each satellite receives uplink signals from an uplink hub (104), and transmits downlink signals in at least one directed beam (112). In an embodiment, downlink signals include television content, which is transmitted within a frequency range between about 3.7 and 4.2 Gigahertz. The satellites follow Molniya orbits (1001-1006, FIG. 10), orbit nodes are equally separated, and the satellite phasing is maintained to provide continuous communication within a coverage area. A system also includes user equipment systems (1300, FIG. 13), which include highly-directional, non-tracking antennas (1302) adapted to receive the downlink signals. In an embodiment, a method includes the satellites maintaining orbit phasings, with respect to other satellites, so that the satellite enters an active orbit segment and initiates transmission of downlink signals as a second satellite exits an active orbit segment and ceases transmission of the downlink signals.
84 Citations
18 Claims
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1. A system, comprising:
a plurality of satellites, wherein each satellite of the plurality of satellites is adapted to receive uplink signals from at least one uplink hub, and to transmit downlink signals toward Earth in at least one directed beam, and wherein orbit paths of the plurality of satellites are Molniya orbits with an orbital period of about 12 hours and an angle of inclination of about 63.4 degrees, and wherein the plurality of satellites track along a common ground track, and wherein the plurality of satellites are phased in their orbits so that a first satellite enters an active orbit segment of the first satellite and initiates transmission of the downlink signals as a second satellite exits an active orbit segment of the second satellite and ceases transmission of the downlink signals, wherein an active orbit segment is centered about an apogee and has a duration of a sidereal day divided by a total number of satellites in the plurality of satellites. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A satellite, comprising:
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at least one uplink antenna subsystem adapted to receive uplink signals from at least one uplink hub; at least one downlink antenna subsystem adapted to transmit downlink signals toward the Earth in at least one directed beam; and a stationkeeping subsystem adapted to maintain the satellite in a Molniya orbit with an orbital period of about 12 hours and an angle of inclination of about 63.4 degrees, and to maintain an orbit phasing of the satellite, with respect to other satellites within a satellite fleet, so that the satellite enters an active orbit segment of the satellite and initiates transmission of the downlink signals as a second satellite exits an active orbit segment of the second satellite and ceases transmission of the downlink signals, wherein an active orbit segment is centered about an apogee and has a duration of a sidereal day divided by a total number of satellites in the satellite fleet. - View Dependent Claims (9)
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10. A user equipment system comprising:
a highly-directional, non-tracking antenna, which is adapted to receive downlink signals transmitted by a satellite of a satellite fleet while the satellite is within an active orbit segment, wherein the active orbit segment is centered about an apogee having a duration of a sidereal day divided by a total number of satellites in the satellite fleet. - View Dependent Claims (11, 12)
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13. A method performed by a satellite, the method comprising:
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maintaining the satellite in a Molniya orbit with an orbital period of about 12 hours, an angle of inclination of about 63.4 degrees; maintaining an orbit phasing of the satellite, with respect to other satellites within a satellite fleet, so that the satellite enters an active orbit segment of the satellite and initiates transmission of downlink signals as a second satellite exits an active orbit segment of the second satellite and ceases transmission of the downlink signals, wherein an active orbit segment is centered about an apogee and has a duration of a sidereal day divided by a total number of satellites in the satellite fleet; receiving an uplink signal from at least one uplink hub; and transmitting the downlink signals toward Earth in at least one directed beam. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification