CubeSat Clock Synchronization for Resilient GPS Networks
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Solution Overview
Problem
Current space-based assets, such as the GPS satellite network, are vulnerable to attacks and lack robustness, necessitating a modern, accurate, and resilient system for Assured Position, Navigation, and Timing (A-PNT) capabilities.
Innovation Solution
A network of CubeSats is used to provide a secure and cost-effective alternative for the GPS network, with clock synchronization methods that identify and utilize the most accurate satellite clock as the grand master clock to generate GPS signals, employing algorithms like Q-input harmonization and Enhanced Best Master Algorithm for selection and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS satellites are replaced with CubeSats to reduce costs and improve resilience, then system robustness and cost-effectiveness improve, but clock synchronization accuracy deteriorates
Solution Approach 1:
The patent divides the satellite constellation into multiple independent CubeSats, each with its own clock device. This segmentation allows the system to replace expensive traditional satellites with cheaper CubeSats while maintaining overall system functionality through the collective contribution of multiple units.
Solution Approach 2:
The patent combines multiple CubeSats into a unified constellation that works together to provide GPS services. By merging the capabilities of numerous low-cost CubeSats, the system achieves reliability and coverage comparable to traditional satellite networks.
Solution Approach 3:
The patent introduces an intermediary clock synchronization system that mediates between individual CubeSat clocks and the overall GPS timing requirement. This intermediary layer coordinates clock data from multiple CubeSats to achieve accurate synchronization without requiring each individual CubeSat to have high-precision atomic clocks.
2Reliability
If multiple CubeSats are deployed to create a resilient network, then system redundancy and security improve, but device complexity increases
Solution Approach 1:
The patent segments the clock synchronization function into independent modules that operate on each CubeSat. This modular approach allows each satellite to function autonomously while contributing to the overall network, simplifying individual unit design despite increased system-scale complexity.
Solution Approach 2:
The patent changes the operational parameters of the CubeSats, specifically their orbital characteristics and communication protocols, to optimize the synchronization process. By adjusting these parameters, the system manages complexity while maintaining resilience through redundant configurations.
3Ease of manufacture
If CubeSats are used instead of traditional GPS satellites, then deployment cost decreases, but manufacturing precision requirements increase
Solution Approach 1:
The patent employs multiple low-cost CubeSats that can be manufactured and deployed more economically than traditional satellites. The system is designed to tolerate individual unit failures, replacing the need for expensive, long-lived satellites with numerous affordable, shorter-lived CubeSats.
Solution Approach 2:
The patent combines the timing data from multiple CubeSats to achieve synchronization accuracy that exceeds what any single low-cost CubeSat could provide alone. This merging of resources allows the use of less precise individual clock devices while maintaining overall system accuracy.
Data Source
AI summary
The present disclosure provides methods and systems for improving the time synchronization of global positioning system (GPS) satellite systems and related methods of using such systems. In some aspects, the GPS satellite systems comprise a swarm of CubeSat or other small form factor satellites.