Method for replacing failing satellites in a satellite communication system

摘要

In a constellation of orbiting satellites (12) in non-geostationary orbits, a failing satellite is replaced with a spare satellite from a spare orbit (53). The satellites (12) are in one of several orbital planes (14) that have an inclination angle with respect to the equator. An orbiting spare satellite located in a monitor orbit (55) is provided for each orbital plane (14). When a failing satellite in the operational orbit is detected, the spare satellite replaces the failing satellite by exchanging positions with the failing satellite. The failing satellite may remain in the monitor orbit to subsequently replace another failing ("sicker") satellite. Accordingly, the satellites that are the "healthiest" are maintained in operation. Cross-links (23) between satellites are maintained minimizing any disruption in communication service when a hole occurs in an orbital plane (14) as a result of a failure.