Dynamic Satellite Beam Assignment for Drift Compensation
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Solution Overview
Problem
Geostationary satellite communications systems face challenges in maintaining reliable service due to spot beam coverage area drifts caused by satellite reflector deflections and attitude changes, which can degrade signal quality for ground terminals, especially with smaller spot beams, and conventional solutions often increase fuel consumption, cost, and complexity.
Innovation Solution
A dynamic spot beam assignment system where a ground processing node monitors beam drift and reassigns ground terminals to other spot beams to maintain signal quality, using link measurement data to detect beam drift and compute updated beam assignment maps that account for load balancing and other factors, ensuring stateful communications without interrupting services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If smaller spot beams are used to increase capacity, then service capacity is improved, but beam drift impact on signal quality worsens
Solution Approach 1:
The patent implements dynamic beam assignment where ground terminals are reassigned to different spot beams based on real-time drift conditions. The system monitors beam drift and dynamically updates the beam assignment map to maintain signal quality while preserving the high-capacity small spot beam configuration.
2Measurement precision
If active on-board attitude control is used to improve pointing accuracy, then beam pointing accuracy is improved, but fuel consumption increases
Solution Approach 1:
The patent replaces mechanical attitude control with a software-based solution. Instead of using fuel-consuming mechanical actuators to adjust satellite pointing, the system uses ground processing to compute dynamic beam assignments that compensate for drift, substituting mechanical action with information processing.
3Stability of the object's composition
If mechanical beam steering or digital beamforming is used to maintain beam pointing, then beam pointing stability is improved, but satellite cost and complexity increase
Solution Approach 1:
The patent extracts the beam steering function from the satellite platform and relocates it to the ground segment. By removing complex mechanical or digital beamforming hardware from the satellite, the system achieves beam pointing stability through ground-based computation of dynamic assignments, reducing satellite complexity while maintaining service quality.
Data Source
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AI summary
Embodiments provide techniques for dynamic spot beam assignment in a geostationary satellite communications network. For example, a ground processing node in the geostationary satellite network can monitor spot beam coverage area location and can detect a beam drift trigger indicating present drifting of one or more coverage areas. Ground terminals can be identified as serviced by spot beams associated with the drifting coverage area(s) and as experiencing a signal quality impact from the drifting. The ground terminal node can compute an update to a beam assignment map having a reassignment of the identified user terminals from their presently servicing spot beams to another of the spot beams in a manner that seeks to address at least some of the signal quality impact identified as associated with the drifting. Some embodiments further account for load balancing, and/or other factors, and/or can maintain stateful communications between the reassigned user terminals and the geostationary satellite.