A Global Single Coverage and Frequency Reuse Algorithm for LEO Satellite Constellation

Abstract

The invention relates to the technical field of satellite communication, in particular to a low-orbit satellite constellation global single-coverage and frequency multiplexing algorithm; aiming at the same-frequency interference problem caused by the extremely complex orbit and beam projection position of the low-orbit satellite constellation, the The idea of ​​discretization of the coverage area introduces technologies such as antenna pattern, satellite orbit position calculation, and repulsion drift model to discretize the ground coverage area into several sampling points; based on the calculation results of the beam position and the satellite position, the decision of the sampling point is introduced. The method makes statistics on the beams where each sampling point is located, and then repeatedly judges the sampling points and iteratively gives the global beam single coverage result, and divides the beam frequency on this basis; after repeated iterations, it is finally achieved that all sampling points do not exist As a result of co-channel interference, the utilization rate of the frequency band of the low-orbit satellite constellation has been improved to the greatest extent on the premise of ensuring global coverage without co-channel interference.

Description

technical field [0001] The invention relates to the technical field of satellite communication, in particular to a low-orbit satellite constellation global single coverage and frequency multiplexing algorithm. Background technique [0002] The low-orbit Internet satellite constellation has the advantages of low delay, large capacity, and global coverage. While bringing these advantages, due to the high-speed movement of the satellite relative to the ground, and the satellite coverage itself will be divided into several beams, so the satellite’s The coverage of geostationary satellites is much more complicated than that of geostationary satellites. When the orbital inclination is close to 90°, satellite orbits densely converge over the North and South Poles to form multiple coverages. In addition, due to the existence of reverse slots in the constellation orbit, the relative motion of the satellites on both sides will also cause frequent staggering of satellite beams. In th...

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Problems solved by technology

[0003] With the development of satellite communications, spectrum resources are becoming more and more scarce, while the demand for data transmission is increasing day by day, which requires satellite communications to achieve high-speed data transmission within a limited bandwidth; currently existing low-orbit satellite constellations such as Iridium Satellite constellation, the method for co-channel interference caused by multiple coverage is: when the satellite approaches the high latitude area near the North Pole, turn off the satellite beam on the odd orbit plane, and when the satellite approaches the high latitude area near the South Pole, turn off the satellite beam on the even orbit plane. On this basis, the beam frequency division is used to avoid the problem of co-channel interference. The problem is that the high latitude and reverse seam areas are still in the state of multiple coverage

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