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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

Active Publication Date: 2018-08-21
ТЕЛЕСАТ КАНАДА
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the constellation described in US Patent 4,809,935 requires four satellites in different orbital planes, meaning that all four satellites would have to be launched individually, and the failure of one satellite would have a significant impact on coverage
Also, because US Patent 4,809,935 requires the use of an orbital period of 72 hours, the apogee of the satellite would have to be so high that it is impractical (ie, around 150,000km)
Also, although US Patent 4,854,527 describes a system that provides global coverage, it only provides a minimum elevation angle of 2°, which is useless in either communication or earth observation applications

Method used

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  • Satellite system and method for global coverage
  • Satellite system and method for global coverage

Examples

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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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Abstract

The present invention relates to satellite systems and more particularly, to the provision of a novel, non-geostationary satellite system and method for weather and climate monitoring, communicationsapplications, scientific research and similar tasks, with global coverage. Contrary to the teachings in the art it has been discovered that global coverage may be obtained using a constellation of sixsatellites in two orthogonal, 24 sidereal hour orbits (geosynchronous) with inclinations of 70 to 90degrees, and eccentricities of 0.275 - 0.45. By placing three of the satellites in a first orbit with an apogee over the north pole, and three of the satellites in a second, orthogonal orbit with an apogee over the south pole, global coverage may be obtained. As well, the satellites in these orbitsavoid most of the Van Allen Belts.

Description

technical field [0001] The present invention relates to satellite systems, and more particularly, the present invention relates to providing a novel, non-geostationary (non-geostationary) satellite system and method with global coverage for weather and climate monitoring, communication applications, aerial Traffic management (ATM), scientific research, and similar tasks. Background technique [0002] Weather monitoring satellites and communication satellites are usually located in Geostationary Orbit (GEO) or Low Earth Orbit (LEO). GEO satellites appear to be stationary in space, allowing the satellite to continuously observe a given area of ​​the Earth's surface. Unfortunately, to obtain such an orbit, the satellite can only be placed directly above the Earth's equator (0°latitude), with a period equal to the Earth's rotation period, with almost zero orbital eccentricity, and an altitude of 35,789km. While such orbits are useful for many applications, they are very poor a...

Claims

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Application Information

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IPC IPC(8): B64G1/10G01W1/08H04B7/185
CPCB64G1/242B64G1/1085B64G1/002B64G1/1007B64G1/1021B64G1/105B64G1/1042B64G1/643
Inventor 安德烈·E·比格斯彼得·迈耶杰克·里格利阿里雷扎·侯赛因保罗·吴苏里德·辛格
Owner ТЕЛЕСАТ КАНАДА
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