Continuously Visible Satellite Constellations
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
The results of this study show that a minimum of six satellites is required in a controlled-orbit constellation to have at least one satellite continuously visible from all points on the earths surface. The study also examined the number of required satellites for different heights and various minimum elevation angles. To have two satellites visible at all times it is sufficient to double the number required for a single-satellite condition to have three satellites simultaneously visible it is sufficient to triple the number required for a single-satellite condition. A constellation that is to have at least one visible satellite every place on the earth results in approximately twice the coverage of the earths surface, but to date no easy method has been found for assuming that this duplication can be used to reduce the number required for having two, or three, mutually visible satellites at one time.
- Active and Passive Radar Detection and Equipment
- Spacecraft Trajectories and Reentry
- Ground Support Systems and Facilities for Space Vehicles