Time-Division Satellite Beam Switching for Interference Avoidance
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Solution Overview
Problem
Satellite communication systems face challenges in flexible capacity allocation without sacrificing capacity in adjacent beams, while adhering to constraints on satellite size, weight, power, and complexity.
Innovation Solution
Implementing time-based frequency reuse schemes that dynamically adapt capacity density across ground-based cells, eliminating the need for frequency partitioning and reducing antenna hardware complexity by using a single filter per polarization and applying time-based beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional frequency reuse patterns are used to avoid inter-beam interference, then interference between beams is minimized, but capacity allocation becomes rigid and satellite hardware complexity increases
Solution Approach 1:
The patent implements dynamic beam switching where amplifiers are sequentially connected to different beam feeds over time. The system transitions from static frequency reuse patterns to dynamic time-division multiplexing, allowing the same amplifier to serve multiple beams at different times. This dynamic approach enables flexible capacity allocation while maintaining interference avoidance through temporal separation.
Solution Approach 2:
The system employs periodic switching of amplifiers between different beam feeds according to predetermined switching patterns. Each amplifier cycles through serving different beams in a periodic manner, creating time-division multiplexed signal paths. This periodic action allows flexible capacity distribution while maintaining frequency reuse constraints through temporal separation.
2Reliability
If frequency partitioning is implemented to manage beam capacity, then inter-beam interference is controlled, but antenna hardware complexity and filter requirements increase
Solution Approach 1:
The patent makes amplifiers universal by enabling each amplifier to serve multiple different beam feeds through time-division switching. Instead of dedicating specific amplifiers to specific frequency partitions, any amplifier can service any beam feed at appropriate times. This multi-functionality reduces the number of amplifiers needed and simplifies antenna hardware while maintaining frequency reuse control through temporal separation.
Solution Approach 2:
The system extracts the frequency partitioning requirement from the hardware architecture and replaces it with time-division multiplexing. By removing the need for complex frequency-specific hardware partitions and filters, the system achieves frequency interference control through temporal separation instead, significantly reducing antenna hardware complexity.
3Weight of stationary object
If satellite size and weight constraints are adhered to, then power consumption is limited, but capacity allocation flexibility is reduced
Solution Approach 1:
The patent merges multiple beam feeds into shared amplifier paths through time-division switching. Multiple beams that would traditionally require separate amplifiers and frequency partitions are combined and served by the same amplifiers at different times. This consolidation reduces the total number of amplifiers, decreasing satellite weight and power consumption while maintaining capacity flexibility through dynamic switching.
Data Source
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AI summary
An RF communications transmitter system comprising a processor, a switch and a plurality of feedhorns. The switch is configured to receive a feed signal of a frequency bandwidth. The processor is configured to control the switch to provide the feed signal to each of at least two of the feedhorns for a respective time period. Each of the at least two feedhorns is configured to generate a beam during the respective time period that the feed signal is provided thereto, wherein the beam is formed based on the feed signal and is transmitted to cover a geographic area of the Earth. The formation and transmission of the beams by the feedhorns is controlled by the processor to provide a time-based allocation of bandwidth amongst the beams based on the time period that the feed signal is provided to each of the feedhorns and a respective frequency/polarization reuse scheme.