Movable Spot Beam Frequency Isolation in LEO-GEO Satellite Coverage
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Solution Overview
Problem
Existing methods for reducing frequency interference between low-orbit communication satellites and Geostationary Earth Orbit (GEO) satellites are inadequate, particularly when LEO satellites use larger beam coverage angles for global service, leading to increased interference and the need for more satellites to maintain continuous coverage.
Innovation Solution
Configure LEO satellites with movable spot beams assigned different sub-frequencies and adjust service areas dynamically to avoid areas where spatial isolation angles are insufficient, and assign different sub-frequencies to spot beams that do not meet minimum isolation angles to reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If LEO satellites use larger beam coverage angles to expand service range, then the number of satellites required is reduced, but frequency interference with GEO satellites increases
Solution Approach 1:
The patent applies beam bias adjustment as a dynamic parameter to control the spatial orientation of satellite beams. By dynamically adjusting the beam bias angle, the system can adaptively avoid GEO satellite coverage areas while maintaining LEO satellite service coverage, thus resolving the contradiction between expanding service area and reducing frequency interference
Solution Approach 2:
The patent changes the beam coverage parameters by introducing beam bias angles and adjusting beam pointing directions. This parameter adjustment allows LEO satellites to maintain large coverage areas while steering beams away from GEO satellite interference zones, effectively resolving the technical contradiction
2Object-affected harmful factors
If beam bias is used to reduce frequency interference, then interference with GEO satellites decreases, but the method is no longer applicable when LEO satellites use larger beam coverage angles for global service
Solution Approach 1:
The patent extends the traditional beam bias method by adding spatial dimension considerations. It determines whether LEO and GEO satellites serve the same ground area by comparing spatial coordinates in addition to beam angles, making the interference avoidance method applicable to both small and large beam coverage scenarios
Solution Approach 2:
The patent introduces a feedback mechanism that calculates spatial isolation angles and determines interference conditions based on satellite positions and beam coverage areas. This feedback loop allows the system to adaptively adjust beam configurations regardless of beam size, restoring method applicability to global service scenarios
Data Source
AI summary
A method for reducing frequency interference, and a communication satellite system. The method includes configuring the communication satellite system, determining 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, enabling the movable spot beams to not enter the areas, and when the movable spot beams of the transmitting and receiving user antennas of multiple adjacent LEO satellites provide services to a same area, calculating a spatial isolation angles between the movable spot beams of the transmitting and receiving user antennas of 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.