Authenticated RTK Positioning via Encrypted Channel Data
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Solution Overview
Problem
Existing Satellite Positioning Systems (SPS) face challenges in ensuring the accuracy and authenticity of position fixes, particularly due to issues like spoofing and jamming, and the limited availability of decryption key material for encrypted channels, which restricts widespread authentication of position fixes.
Innovation Solution
A method that integrates real-time kinematic (RTK) or differential SPS correction data with encrypted SPS channel authentication, allowing mobile terminals to receive authentication data without decrypting the encrypted channels, using either a trusted third-party server for decryption or snippet messages for correlation, ensuring the accuracy and authenticity of position fixes without compromising security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encrypted SPS channels are used for authentication, then position fix authenticity is improved, but device complexity increases due to decryption key requirements
Solution Approach 1:
The patent extracts only the necessary authentication data from the encrypted SPS channels without requiring full decryption capability at the mobile terminal. The authentication data is obtained through alternative means (trusted server or snippet messages), removing the complex decryption key requirement from the end-device while preserving authentication functionality.
Solution Approach 2:
The patent introduces an intermediary trusted server that holds the decryption key material and provides authentication data to mobile terminals. This mediator approach allows authentication without requiring the terminal to possess complex decryption capabilities, thus resolving the contradiction between reliability and device complexity.
2Measurement precision
If RTK/dSPS correction data is used, then position fix accuracy is improved, but vulnerability to spoofing and jamming increases
Solution Approach 1:
The patent merges RTK/dSPS correction data with encrypted channel authentication data to create a combined authentication mechanism. This integration ensures that both accuracy (from RTK/dSPS) and anti-spoofing protection (from encrypted channel verification) are achieved simultaneously, resolving the contradiction between precision and reliability.
Solution Approach 2:
The patent applies preliminary authentication verification of encrypted channels before accepting RTK/dSPS correction data. By pre-verifying the authenticity of the correction data source through encrypted channel authentication, the system prevents spoofing and jamming attacks before they can compromise positioning accuracy.
3Reliability
If full decryption of encrypted SPS channels is performed, then authentication capability is improved, but security is compromised due to key exposure
Solution Approach 1:
The patent extracts only the essential authentication information from the encrypted channels without performing full decryption at the mobile terminal. Authentication data is obtained through controlled means (trusted server or snippet messages) that do not require exposing decryption keys, thus maintaining security while achieving authentication capability.
Solution Approach 2:
The patent uses snippet messages that contain correlated portions of encrypted channel data, serving as authenticated copies that verify signal authenticity without requiring the mobile terminal to possess or expose the actual decryption keys. This copying approach enables authentication while preserving security.
Data Source
AI summary
Embodiments of the invention provide that when performing a position fix a user who makes use of RTK or dGNSS correction data from a RTK/dGNSS service to obtain more accurate position fixes also receives from that same service data derived from the encrypted GNSS channels that authenticates whether the position fix determined by the mobile terminal based on the RTK/dGNSS data can be relied upon. By providing such an integrated service the mobile user terminal is able to obtain an authenticated, highly accurate positional fix which it can be certain can be relied upon.