Satellite system and method for global coverage

A satellite system and satellite technology, which is applied in the field of satellite systems, can solve problems such as coverage impact and achieve the effect of graceful degradation

Active Publication Date: 2022-05-24
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
  • Satellite system and method for global coverage

Examples

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Effect test

Embodiment 2

[0074] Example 2 uses the same orbital parameters as Example 1, except three satellites are used in a single plane instead of two. Of course, the three satellites are scheduled to be spaced 8 hours apart. As such, this embodiment provides continuous coverage north of latitude 21°, with an elevation angle of 10°. This represents a coverage of only 32% of the Earth. The constellation is represented in Figure 6A shown in the Figure 6B A simulation of the coverage it provides is shown. Of course, turning the orbit around would put the apogee above the South Pole, yielding complete coverage south of 21°S latitude, 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. The 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 represented in Figure 7A shown in the Figure 7B A simulation of the coverage it provides is shown. Of course, turning the orbit around would put the apogee above the South Pole, producing continuous coverage south of 18° south latitude, with an elevation angle of 10°.

Embodiment 4

[0076] Example 4 uses the same number of satellites as Example 3, but instead of placing the 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 above the North Pole. above Antarctica. Two satellites are placed in each orbital path, evenly spaced 12 hours apart. Relative to Example 3, global coverage is significantly improved, providing continuous coverage of 57% of the Earth with an elevation angle of 10°. The constellation is represented in Figure 8A shown in the 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, the present invention relates to providing a global coverage, novel, non-geostationary satellite system and method for use in weather and climate monitoring, communication applications, scientific research, and the like Task. Contrary to what is taught in the art, it has been found that global coverage can be obtained using a constellation of six satellites in two orthogonal, 24 sidereal-hour orbits (geosynchronous) with orbits of 70° to 90° Slope and eccentricity of 0.275 to 0.45. Global coverage can be obtained by placing three of these satellites in a first orbit with apogee above the North Pole and three of these satellites in a second orthogonal orbit with apogee above the South Pole. At the same time, satellites in these orbits avoid 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 global coverage, novel, non-geostationary satellite system and method for use in weather and climate monitoring, communications applications, airborne 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 immobile in the sky, allowing the satellite to continuously observe a given area of ​​the Earth's surface. Unfortunately, such an orbit can only be obtained by placing the satellite directly above the Earth's equator (0° latitude), with a period equal to the Earth's rotation period, with an orbital eccentricity of almost zero, and an altitude of 35,789km. While such orbits are useful in many applications, they are very poor at cove...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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