Distributed Antenna Phase Calibration for Solar Power Satellites
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Solution Overview
Problem
Conventional large unified solar power satellite structures face challenges in maintaining phase coherence, structural flexibility, and efficiency due to their enormous size, making it difficult to construct, maintain, and calibrate the antenna system effectively.
Innovation Solution
A novel antenna calibration technique using a remote sourced pilot phase and timing signals to synchronize clocks on each segment, establishing a temporal structure through a time reference surface, enabling phase coherence without structural unity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a very large unified antenna structure is used for solar power satellite, then the power transmission capability is improved, but the manufacturing precision and phase coherence maintenance become extremely difficult
Solution Approach 1:
The patent divides the large unified antenna structure into multiple smaller antenna segments that can be independently manufactured, positioned, and calibrated. Each segment operates autonomously but contributes to the overall power transmission beam, eliminating the need to maintain phase coherence across a single massive structure while achieving equivalent power transmission capability through coordinated operation of distributed segments.
2Illumination intensity
If a kilometer-wide antenna structure is used, then the illumination control on ground is improved, but the structural stability under environmental stressors deteriorates
Solution Approach 1:
The antenna system is segmented into multiple independent units distributed across the satellite platform. Each segment can be independently positioned and oriented to maintain precise illumination control on the ground target, while the distributed architecture eliminates the need for a single large rigid structure that would be vulnerable to environmental stressors.
Solution Approach 2:
The patent employs dynamic positioning and phase adjustment mechanisms that allow each antenna segment to independently adapt its orientation and transmission phase in real-time. This dynamic control system maintains precise ground illumination while accommodating structural flexibility and environmental variations, replacing the need for rigid structural stability.
3Device complexity
If a disarticulated architecture with remote clocks is used, then the device complexity is reduced, but the synchronization precision deteriorates
Solution Approach 1:
The patent introduces a master clock as an intermediary time reference that all distributed antenna segments reference. Each segment's local clock is synchronized to the master clock through signal exchange and time transfer protocols, enabling precise synchronization across the disarticulated architecture without requiring complex inter-segment communication infrastructure.
Solution Approach 2:
The system implements feedback mechanisms where each antenna segment continuously monitors its phase coherence relative to the master clock and adjusts its transmission timing accordingly. This closed-loop synchronization maintains precise temporal coordination across distributed segments while keeping the overall device architecture simple and modular.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Achieves two orders of magnitude improvement in synchronization accuracy, allowing efficient and safe power transmission from a dispersed constellation of small satellites, eliminating the need for structural unity and enabling precise phase alignment.
Implementation Method 1
a distant calibration source transmits electromagnetic pilot wave and time marking signal
Data Source
AI summary
This invention employs a novel method of phase calibrating a very large distributed antenna. The calibration technique makes possible a new, and more practical, architecture for Solar Power Satellites. Most previous solar power satellite concepts involve the construction of unified multi-kilometer sized structures. With this invention, rather than a large unified structure, the invention may employ a collection of small free flying satellites distributed over a volume several kilometers in diameter. The invention shows how to coherently phase conjugate a microwave signal transmitted from the ground up to the constellation of satellites so that the amplified return transmission is concentrated in a desired way within a highly restricted area on the ground. The invention solves the problem of achieving the required phase precision in the return microwave beam. The invention also provides a new way to more uniformly distribute the microwave beam over a large ground based rectenna.