Trajectory Authentication via Rotational Profile Comparison
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Solution Overview
Problem
Current satellite navigation systems are vulnerable to decoy devices that emit falsified radiolocation signals, allowing users to fraudulently obtain false geographical position coordinates, which undermines the business model of commercial services relying on navigation data authenticity, particularly in fields like road tolls and maritime fleets.
Innovation Solution
A method and device that calculate and compare rotational movement profiles from both radiolocation signals and independent sensors to authenticate the trajectory, detecting discrepancies that indicate the use of decoy devices, thereby preventing fraud.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If decoy devices emit falsified radiolocation signals, then false geographical position coordinates are obtained, but navigation data authenticity is compromised
Solution Approach 1:
The patent introduces an intermediary verification system that compares independently calculated trajectory data (from ephemeris and signal measurements) with provided trajectory data. This intermediary comparison mechanism detects discrepancies caused by decoy devices without directly interfering with the radiolocation signals themselves, thereby maintaining navigation data authenticity while countering decoy interference.
Solution Approach 2:
The system implements feedback by continuously monitoring and comparing trajectory calculations. The independent calculation of trajectory from ephemeris and signal measurements provides a feedback reference against which provided trajectory data is validated. This feedback loop enables real-time detection of decoy device interference and allows the system to reject fraudulent navigation data.
2Reliability
If ephemeris data is protected, then origin and content are guaranteed, but signal protection complexity increases
Solution Approach 1:
The patent segments the navigation data verification process into distinct components: ephemeris data protection (maintained as before), signal measurement, and independent trajectory calculation. By separating these functions, the system protects ephemeris data integrity through existing mechanisms while adding a relatively simple independent verification path that does not require complex modifications to the core protection system.
Solution Approach 2:
The system creates a copy of the trajectory calculation process using independent inputs (ephemeris and signal measurements) to generate an expected trajectory. This copied calculation serves as a reference for validation without requiring complex protection mechanisms, as it simply replicates the mathematical computation using trusted input data.
3Reliability
If trajectory authentication is implemented, then fraud is prevented, but processing complexity increases
Solution Approach 1:
The authentication system leverages existing multi-functional components: the receiver processes both positioning signals and authentication verification, the ephemeris data serves both navigation and verification purposes, and the trajectory calculation serves both route determination and fraud detection. This universality reduces processing complexity by avoiding dedicated separate systems for each function.
Data Source
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AI summary
The method involves calculating a rotational movement profile movable around a movable reference axis from data of radiolocation signal processing. Another rotational movement profile movable around the same reference axis is calculated from movement data of measuring units independent of radiolocation signals. The movable rotational movement profiles are compared, where the movable rotational movement profiles are profiles representing evolution of movable course over time. An independent claim is also included for a device for authenticating a displacement trajectory calculated from radiolocation signals received by a receiver embarked in a traveling object.