Satellite Telecommunications Payload Multibeam Grouping
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Solution Overview
Problem
Current satellite telecommunications systems face complexity and cost issues in generating multibeam coverage due to the need for multiple reflectors and mismatched feed and reflector characteristics, leading to interference between beams of different sizes.
Innovation Solution
A method and payload system that generates composite beams by grouping elementary beams of identical or varying sizes, using identical feed antennas and reflectors, and managing polarization and frequency to minimize interference and optimize beam size flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple different reflectors are used to generate beams of very different sizes, then beam size flexibility is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent divides the coverage region into multiple zones, each served by dedicated feed antennas with specific characteristics. Each feed antenna generates a beam tailored to its zone's requirements, eliminating the need for multiple reflectors while achieving beam size diversity through feed antenna segmentation and assignment to different coverage zones
Solution Approach 2:
A single reflector is designed to work with multiple different feed antennas, each having different characteristics (aperture, focal distance, illumination). This universal reflector design allows the system to generate beams of various sizes using one reflector, thereby reducing device complexity while maintaining beam size flexibility
2Area of stationary object
If beams of large dimensions are used to cover low user density zones, then coverage area is improved, but transmission pattern slopes become less steep causing increased interference with smaller beams
Solution Approach 1:
The patent assigns different feed antenna characteristics to different coverage zones based on local requirements. Feed antennas are selected and positioned to provide appropriate beam sizes and intensity profiles for each zone, ensuring that beams have sufficient directionality and steep intensity slopes even in low-density areas, thereby minimizing interference while maintaining adequate coverage
Solution Approach 2:
The system varies feed antenna parameters (aperture size, focal distance, illumination characteristics) to control beam properties. By adjusting these parameters, the system maintains steep transmission pattern slopes across all beam sizes, preventing the progressive intensity decrease that causes interference in conventional large-coverage beams
3Productivity
If fine beams of minimal angular aperture are used in high user density zones, then transmission capacity is improved, but the number of required antennas increases
Solution Approach 1:
The coverage region is segmented into multiple zones with dedicated feed antennas. Each feed antenna is optimized for its specific zone, generating fine beams with minimal angular aperture where needed. This segmentation allows the system to achieve high transmission capacity in dense zones while using fewer total antennas compared to a uniform fine-beam approach across the entire coverage area
Data Source
AI summary
A method for multibeam coverage of a region of the surface of the Earth includes the generation, by a telecommunications payload embedded on a satellite, of a plurality of radiofrequency beams, called elementary beams; the formation of a plurality of radiofrequency beams, called composite beams, exhibiting footprints on the ground of different sizes, each the composite beam being obtained by the grouping of one or more elementary beams; and the transmission or the reception of data through the composite beams, identical data being transmitted or received through all the elementary beams forming one and the same composite beam.