Variable-Power Satellite Payload Amplifiers for Flexible RF Allocation
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Solution Overview
Problem
Current satellite communication payloads face challenges in accurately forecasting and matching satellite capacity demand across different regions, leading to inefficiencies in bandwidth and RF power allocation, due to limitations in the number and power of amplifiers, which restrict flexibility and revenue generation.
Innovation Solution
A digital payload subsystem that includes a digital channelizer and power amplifiers with commandably variable saturated power, controlled by a processor to dynamically adjust bandwidth and RF power allocation in finer increments, allowing for better matching of satellite resources to end-user demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If analog RF switches are used to route amplifier outputs to different beams, then bandwidth allocation flexibility is improved, but the number of amplifiers and their power ratings are limited by spacecraft resource constraints (volume, mass, thermal capacity)
Solution Approach 1:
The patent implements variable power amplifiers that can dynamically adjust their output power levels and saturation points through electronic control. This allows a fixed number of amplifiers to provide flexible bandwidth and power allocation by changing their operating characteristics rather than requiring additional hardware components to be added or reconfigured.
Solution Approach 2:
The invention changes the operating parameters of the power amplifiers, specifically the saturation power level, which can be electronically adjusted. By varying the saturation point and output impedance of amplifiers, the system can allocate bandwidth and power to different beams without needing to physically reconfigure the amplifier array or add more amplifiers.
2Adaptability or versatility
If fixed power amplifiers are used, then device complexity is reduced, but bandwidth and RF power allocation flexibility is limited
Solution Approach 1:
The variable power amplifiers are designed to perform multiple functions: they can operate at different power levels, adjust their saturation points, and serve multiple beam configurations. This multi-functionality allows a single amplifier to replace what would traditionally require multiple fixed-power amplifiers, reducing overall system complexity while increasing flexibility.
Solution Approach 2:
The patent replaces mechanical or hardware-based power allocation methods (such as physical switches and fixed amplifier configurations) with electronic control mechanisms. By using electronic adjustment of amplifier parameters rather than mechanical reconfiguration, the system achieves greater flexibility with reduced physical complexity.
3Adaptability or versatility
If amplifiers operate below rated power, then bandwidth allocation flexibility is improved, but DC power consumption efficiency decreases and heat dissipation increases
Solution Approach 1:
The variable power amplifiers can dynamically adjust their saturation power levels to match the actual bandwidth allocation requirements. When an amplifier operates near its adjusted saturation point rather than far below a fixed high power rating, it achieves higher efficiency and lower heat dissipation. This dynamic adaptation eliminates the waste associated with operating fixed-power amplifiers at low efficiency points.
Data Source
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AI summary
A spacecraft includes a payload subsystem including a plurality of transmit antenna feeds, a digital channelizer, and a power amplification arrangement including a plurality of power amplifiers. The power amplification arrangement has at least one input communicatively coupled with an output of the digital channelizer and at least one output communicatively coupled with at least one of the plurality of transmit antenna feeds. A processor is configured to control the digital channelizer, and to adjust a saturated output power of at least one power amplifier of the plurality of power amplifiers in the power amplification arrangement.