Multi-Altitude Satellite Constellation Design for Collision Avoidance
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Solution Overview
Problem
Conventional satellite constellation designs face challenges in maintaining even spacing and collision avoidance as the number of satellites increases, particularly when all satellites are at the same altitude, leading to complex station-keeping requirements and potential collisions.
Innovation Solution
The configuration segregates satellites into planes with different altitudes, allowing for arbitrary spacing within each plane and reducing the need for precise alignment, thereby enhancing passive safety and collision avoidance while simplifying station-keeping and debris management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If all satellites are positioned at the same altitude in a constellation, then the coverage area of each satellite is maximized and the number of satellites required is minimized, but the complexity of collision avoidance and station-keeping increases significantly
Solution Approach 1:
The patent applies vertical stratification by dividing the constellation into multiple altitude layers. Satellites are distributed across different orbital altitudes rather than all occupying the same orbital plane, thereby adding a vertical dimension to the constellation architecture. This dimensional change reduces horizontal collision probability while maintaining overall coverage area, as satellites at different altitudes have reduced intersection points in their orbital paths.
Solution Approach 2:
The constellation is segmented into multiple independent altitude layers, each containing a subset of satellites. This segmentation allows independent station-keeping and collision avoidance strategies for each layer, reducing the overall system complexity. Each layer can be managed separately, and failure or collision in one layer does not directly impact other layers, thereby reducing the cumulative complexity of collision avoidance across the entire constellation.
2Reliability
If the number of satellites in a constellation is increased to improve temporal and spatial coverage, then the coverage quality is enhanced, but the complexity of maintaining even spacing and avoiding collisions increases
Solution Approach 1:
By introducing vertical altitude variation, the patent distributes satellites across multiple elevation layers rather than confining them to a single orbital plane. This dimensional approach allows for higher satellite densities while maintaining spatial separation through altitude differentiation. Satellites can be closely spaced in terms of orbital mechanics while remaining vertically separated, thus improving coverage quality without proportionally increasing station-keeping complexity.
Solution Approach 2:
Different altitude layers can have different satellite spacing configurations optimized for their specific operational requirements. Each layer can be independently configured with appropriate inter-satellite distances, allowing local optimization of coverage density without requiring uniform spacing across the entire constellation. This local quality approach reduces the overall complexity of maintaining even spacing.
3Stability of the object's composition
If all satellites maintain constant relative in-track position to prevent coverage gaps, then ground coverage continuity is ensured, but the flexibility in satellite insertion and removal is reduced
Solution Approach 1:
The constellation is divided into independent altitude layers, each capable of maintaining its own coverage continuity through local satellite positioning. This segmentation allows satellites to be inserted or removed from specific layers without requiring repositioning of satellites in other layers, thereby maintaining coverage continuity while increasing operational flexibility for satellite lifecycle management.
Solution Approach 2:
The patent enables dynamic reconfiguration of satellite positions within and between altitude layers. Satellites can be flexibly inserted, removed, or repositioned in response to operational requirements, payload failures, or mission changes. The multi-layer architecture provides dynamic adaptability while maintaining overall coverage continuity through coordinated adjustments across layers.
Data Source
AI summary
A configuration for a satellite constellation has a plurality of planes, each plane including a plurality of satellites therein, at least some of the planes situated at a different altitude than other of the planes. In some embodiments, all planes contain the same number of satellites; in some other embodiments, at least one plane includes a different number of satellites than the other planes in the constellation. In some embodiments, the satellites in each plane are evenly spaced.