Satellite system and method for global coverage
A satellite system and satellite technology, applied in the field of satellite systems, can solve problems such as coverage impact
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Embodiment 2
[0074] Example 2 uses the same orbital parameters as Example 1, except that three satellites are used instead of two in a single plane. Of course, the three satellites are scheduled to be 8 hours apart. As such, this embodiment provides continuous coverage north of 21° north latitude, with an elevation angle of 10°. This represents a coverage of only 32% of the Earth. The constellation is shown in the Figure 6A shown in , while Figure 6B A simulation of the coverage it provides is shown. Of course, turning the orbit around would place the apogee above the South Pole, yielding complete coverage south of 21°S, with an elevation angle of 10°.
Embodiment 3
[0075] Example 3 shows the effect of adding a fourth satellite to the single plane of Examples 1 and 2, otherwise using the same orbital parameters. These four satellites are very evenly spaced 6 hours apart from each other. The result is only a modest improvement in coverage relative to Example 2, providing continuous coverage north of 18°N latitude with an elevation angle of 10°. This represents a coverage of only 34% of the Earth. The constellation is shown in the Figure 7A shown in , while Figure 7B A simulation of the coverage it provides is shown. Of course, turning the orbit around would place the apogee above the South Pole, yielding continuous coverage south of 18° south latitude, with an elevation angle of 10°.
Embodiment 4
[0076] Embodiment 4 uses the same number of satellites as in Embodiment 3, but instead of placing four satellites on the same orbital path, two coplanar orbital paths are used, one with the apogee above the North Pole and the other with the apogee at above Antarctica. Two satellites are placed in each orbital path, spaced an average of 12 hours apart from each other. Compared with embodiment 3, the global coverage is significantly improved, providing continuous coverage of 57% of the earth, with an elevation angle of 10°. The constellation is shown in the Figure 8A shown in , while Figure 8B A simulation of the global coverage it provides is shown.
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