US 12,470,288 B2
Method for reducing frequency interference, and communication satellite system
Fenglong Hou, Beijing (CN); Feng Li, Beijing (CN); Xiaoxiong Lin, Beijing (CN); Yu Qi, Beijing (CN); Shengwei Pei, Beijing (CN); Dong Chen, Beijing (CN); Jie Xing, Beijing (CN); Hua Huang, Beijing (CN); Xingang Li, Beijing (CN); Jincheng Tong, Beijing (CN); Hengchao Sun, Beijing (CN); Shaoran Liu, Beijing (CN); and Zeyu Bao, Beijing (CN)
Assigned to Chinese Academy of Space Technology, Beijing (CN)
Appl. No. 18/547,553
Filed by CHINA ACADEMY OF SPACE TECHNOLOGY, Beijing (CN)
PCT Filed Sep. 30, 2021, PCT No. PCT/CN2021/122006
§ 371(c)(1), (2) Date Aug. 23, 2023,
PCT Pub. No. WO2022/179106, PCT Pub. Date Sep. 1, 2022.
Claims priority of application No. 202110220776.4 (CN), filed on Feb. 26, 2021.
Prior Publication US 2024/0137110 A1, Apr. 25, 2024
Prior Publication US 2024/0235661 A9, Jul. 11, 2024
Int. Cl. H04B 7/185 (2006.01)
CPC H04B 7/18519 (2013.01) 20 Claims
OG exemplary drawing
 
1. A method for reducing frequency interference between a communication satellite system and a Geostationary Earth Orbits (GEO) satellite and reducing frequency interference within the communication satellite system, comprising:
configuring the communication satellite system containing a plurality of Low Earth Orbit (LEO) satellites, wherein each LEO satellite is provided with a transmitting user antenna for providing a downlink business beam service for users and a receiving user antenna for providing an uplink business beam service for the users, wherein the transmitting user antenna and the receiving user antenna each comprises a plurality of movable spot beams, each movable spot beam is configured as a sub-beam assigned with a different sub-frequency as needed, and the movable spot beam is configured to realize a sub-satellite user gazing or tracking function of the LEO satellite by dynamically adjusting a service area;
determining, based on a current location of each LEO satellite, a first range of areas in which a spatial isolation angle between the LEO satellite and the GEO satellite does not satisfy a minimum spatial isolation angle within service areas of the movable spot beams of the transmitting and receiving user antennas, enabling the movable spot beams of the transmitting and receiving user antennas to not enter the areas in which the minimum spatial isolation angle is not satisfied, to reduce frequency interference between the movable spot beams of the transmitting and receiving user antennas of the LEO satellite and the GEO satellite; and
when the movable spot beams of the transmitting user antennas and the receiving user antennas of a plurality of adjacent LEO satellites provide services to a same area, calculating a spatial isolation angle between the movable spot beams of the transmitting user antennas of any two adjacent LEO satellites and a spatial isolation angle between the movable spot beams of the receiving user antennas of the any two adjacent LEO satellites, and in response to the spatial isolation angle not satisfying the minimum spatial isolation angle, assigning different sub-frequencies to the movable spot beams that do not satisfy the minimum spatial isolation angle, to reduce frequency interference within the communication satellite system.