GNSS Navigation Data Authentication via Terrestrial Assistance
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Solution Overview
Problem
Global Navigation Satellite Systems (GNSS) receivers face performance gaps in urban areas and are vulnerable to spoofing due to the lack of signal authentication, which affects the reliability of location-based services.
Innovation Solution
The method involves obtaining and assembling navigation data from terrestrial apparatuses, including Galileo, to create a message authentication code that verifies the authenticity of the data, ensuring that only authentic navigation data is used for positioning, thereby preventing spoofing and enhancing the reliability of satellite navigation systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If GNSS receivers use open service signals from satellites, then accessibility and ease of operation are improved, but vulnerability to spoofing attacks increases
Solution Approach 1:
The patent introduces an intermediary authentication mechanism that verifies the legitimacy of GNSS signals before they are processed by the receiver. This mediator layer checks cryptographic authentication data and signal characteristics to distinguish genuine satellite signals from spoofed ones, thereby maintaining ease of operation while eliminating spoofing vulnerability
Solution Approach 2:
The patent implements preliminary authentication actions by pre-storing cryptographic keys and authentication data in the receiver. Before processing any GNSS signal, the system performs preliminary verification of signal authenticity using these pre-loaded credentials, preventing spoofed signals from being processed further
2Reliability
If GNSS receivers operate in urban areas with blockage, then positioning capability is reduced, but signal authentication becomes more challenging
Solution Approach 1:
The patent employs feedback mechanisms where the receiver continuously monitors signal characteristics, authentication data quality, and positioning accuracy. When signal conditions deteriorate in urban environments, the system adjusts authentication thresholds and requests additional verification data, maintaining reliable operation despite increased detection difficulty
Solution Approach 2:
The patent dynamically changes authentication parameters such as verification thresholds, data request frequencies, and cryptographic key selection based on signal quality metrics. In urban blockage conditions, the system adjusts these parameters to accommodate weaker signals while maintaining authentication security
3Reliability
If navigation data is transmitted via terrestrial systems instead of satellites, then signal reliability in urban areas is improved, but data authentication becomes necessary
Solution Approach 1:
The patent merges satellite-based authentication mechanisms with terrestrial transmission systems. The same cryptographic authentication protocols used for satellite signals are applied to terrestrial data transmissions, unifying the authentication process and avoiding additional complexity while improving urban reliability
Data Source
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AI summary
A system obtains navigation data for Galileo from at least one terrestrial apparatus. The obtained navigation data corresponds to navigation data transmitted by a Galileo satellite. The system assembles assistance data comprising navigation data for Galileo and further data in an interrelated manner such that MACs included for the navigation data for Galileo is usable for verifying authenticity of the further data as well. The system transmits the information to a device, which verifies the authenticity of the included navigation data for Galileo based on the MACs. Only in case the navigation data for Galileo in the assistance data is determined to be authentic, it considers the further data to be authentic.