ADS-B Horizontal Position Validation via Multi-Vehicle Time Difference
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Solution Overview
Problem
ADS-B messages lack authentication and validation, leading to risks of erroneous or misleading information due to errors or malicious spoofing, which can cause collisions and hazardous conditions in air travel.
Innovation Solution
A system where multiple time-synchronized vehicles receive and timestamp ADS-B messages, transmitting this data to a central station or another vehicle for validation by comparing timestamp differences and altitude information to determine the validity of the horizontal position information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If ADS-B messages are used for real-time tracking and situational awareness, then productivity and situational awareness are improved, but reliability deteriorates due to unauthenticated and unvalidated messages that can be erroneous or spoofed
Solution Approach 1:
The system implements feedback by having vehicles receive ADS-B messages, validate them against their own position data and timestamps, and then re-transmit validated messages. This feedback loop allows the system to correct and verify information continuously, improving reliability while maintaining real-time tracking capability.
Solution Approach 2:
The patent introduces an intermediary validation process where vehicles act as mediators between the original message source and the receiving vehicles. Each vehicle validates incoming messages against its own position and timestamp data before forwarding, creating a chain of verification that improves reliability without sacrificing real-time tracking.
2Reliability
If multiple vehicles validate ADS-B messages using timestamp differences and position data, then reliability is improved, but device complexity increases due to additional validation processing requirements
Solution Approach 1:
Each vehicle performs self-service validation by using its own position data and timestamp to verify incoming ADS-B messages. The validation logic is distributed across all vehicles rather than centralized, which improves reliability through multiple independent verification points while keeping individual device complexity manageable through standardized self-validation routines.
Solution Approach 2:
The system employs homogeneous validation logic across all vehicles, where each vehicle uses the same validation principles (timestamp comparison, position data matching) regardless of its specific identity or location. This homogeneity simplifies the overall system architecture by using uniform validation rules throughout the fleet rather than requiring complex heterogeneous validation systems.
Data Source
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AI summary
A method of validating ADS-B is described herein. The method includes receiving, from time synchronized vehicles, ADS-B data (identifier, horizontal position information, and altitude information for a first vehicle) with a timestamp (defining a time of reception of the ADS-B message). The method includes receiving, from each vehicle, a determined position at the time of reception of the ADS-B message. The method includes determining differences in time of arrival for the ADS-B message to each vehicle, extracting altitude information from the ADS-B data, and determining an estimated horizontal position of the first vehicle based on the differences in time of arrival, the determined positions received from each vehicle, and the extracted altitude information. The method includes determining whether the horizontal position information in the ADS-B message is valid based on a comparison of the estimated horizontal position of the first vehicle and the horizontal position information in the ADS-B message.