Satellite Beam Switching via Switch Matrix for Moving Platforms
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Solution Overview
Problem
Current satellite communication systems experience frequent connection losses and inefficiencies when moving platforms, such as aircraft, transition between satellite beams due to low power density and complex pre-planning requirements, leading to costly and inefficient spectrum usage.
Innovation Solution
A method and system for automated switching between satellite beams using a switch matrix and on-board processor to determine optimal beam shift timing and quality, ensuring continuous communication by examining connection quality before switching and reverting if it falls below a threshold, with components like demodulators and channelizers for synchronized uplink and downlink shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If wide beam satellites are used for continuous connection over large distances, then connection continuity is improved, but power density and sensitivity decrease making high data rates impossible
Solution Approach 1:
The satellite coverage area is divided into multiple spot beams instead of using a single wide beam. Each spot beam concentrates energy to provide high power density while the collection of beams covers the entire service area, enabling both continuous connection and high data rates.
Solution Approach 2:
The system dynamically switches between different spot beams as the moving platform transitions between beam coverage areas. This dynamic beam switching maintains continuous connection while utilizing the high power density of individual spot beams for high data rate communication.
2Power
If multi-spot beam satellites are used for high power density and high sensitivity, then power density is improved, but frequent beam switching is required causing connection losses
Solution Approach 1:
The system performs preliminary actions by pre-planning beam switch timing and coordinating frequency changes before the moving platform actually transitions between beams. This advance preparation ensures seamless beam switching without connection losses.
Solution Approach 2:
The system uses feedback from the moving platform's position and velocity to dynamically adjust beam switching timing and frequency allocation. This real-time feedback ensures reliable connection maintenance during beam transitions even when pre-planning is not feasible.
3Ease of operation
If pre-planning of beam shifts is performed before trips, then beam switching coordination is improved, but complexity increases due to flight delays and route changes
Solution Approach 1:
The system transitions from static pre-planned beam switching to dynamic real-time beam switching control. The satellite operator receives real-time position and velocity data from moving platforms and dynamically adjusts beam assignment and frequency allocation, eliminating the need for complex pre-planning while adapting to changing flight conditions.
4Ease of operation
If frequencies are reserved in particular beams through pre-planning, then beam switching coordination is improved, but spectrum efficiency decreases and service costs increase
Solution Approach 1:
The system implements dynamic frequency allocation where frequencies are assigned to beams in real-time based on actual demand and moving platform positions. This eliminates the need for long-term frequency reservations, improving spectrum efficiency while maintaining coordinated beam switching through real-time control.
Data Source
AI summary
A method for shifting communications of a terminal located on a moving platform from a first satellite beam to a second satellite beam comprises determining a time for initiation of a beam shift from the first satellite beam to the second satellite beam; executing a first beam shift from the first satellite beam to the second satellite beam; and executing a second beam shift from the first satellite beam to the second satellite beam, wherein the first and second beam shifts are performed using a switch matrix.