Communication satellite system
Abstract
Abstract SUN-DEPENDENT SERVICE INTERRUPTIONS PLAGUING GEOSTATIONARY COMMUNICATION SATELLITE SYSTEMS ARE AVOIDED THROUGHOUT THE YEAR BY A SYSTEM UTILIZING SUN-SYNCHRONIZED SPACE DIVERSITY SATELLITES IN NEAR-GEOSTATIONARY ORBITS STABILIZED WITH RESPECT TO THE STARS. TWO SATELLITES ARE PLACED IN PRECISELY ORIENTED INCLINED EARTH-SYNCHRONOUS CIRCULAR ORBITS AND A PRESCRIBED SEPARATION OF THE MEAN LONGITUDES OF THE RESULTANT SIDEREAL FIGURE 8 PATTERNS COMBINED WITH A PRECISE OPPOSITE PHASING OF THE SATELLITES IN THEIR RESPECTIVE ORBITS RESULTS IN A SYSTEM IN WHICH THE TWO SATELLITES EXHIBIT NEITHER CONCURRENT NOR SERIAL OUTAGES OVER THE PARTICULAR GEOGRAPHIC ZONE TO BE SERVICED. EARTH TERMINALS REQUIRE ONLY 24-HOUR SIDEREAL CYCLIC CAM DRIVES FOR PROPER ANTENNA POINTING AND SLOW DIVERSITY SWITCHING AT INFREQUENT NONCRITICAL TIMES.
Inventors
- 👤 Carl William Lundgren Jr
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |