V2X Path History Correction for GNSS Signal Loss
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Solution Overview
Problem
Vehicles equipped with V2X systems face inaccuracies in path history information due to loss of GNSS position fix, leading to incorrect prediction of roadway geometry and malfunctioning of local safety systems.
Innovation Solution
A method and system for broadcasting basic safety messages that involve storing and correcting path history entries based on the availability of a GNSS position fix, including deleting or modifying entries when a fix is unavailable, using a timer or distance thresholds, and generating BSM packets with accurate path history information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle continues to use path history entries when GNSS position fix is unavailable, then the system maintains continuous operation, but the path history information becomes inaccurate
Solution Approach 1:
The system performs preliminary actions by deleting inaccurate path history entries before they can contaminate future predictions. When GNSS position fix is lost, the system proactively removes outdated path history data rather than waiting for it to cause harm, thereby preventing inaccurate roadway geometry predictions while maintaining continuous operation.
Solution Approach 2:
The system discards inaccurate path history entries when GNSS position fix becomes unavailable, and recovers accurate data when the position fix is restored. This cyclic process of deletion and recovery ensures that only valid path history information is used for safety predictions, resolving the contradiction between continuous operation and measurement precision.
2Measurement precision
If the system deletes path history entries when GNSS position fix is unavailable, then path history accuracy is maintained, but the system complexity increases
Solution Approach 1:
The system implements feedback mechanisms by continuously monitoring GNSS position fix availability and automatically adjusting path history entry retention accordingly. When position fix is lost, the system feedback-driven deletion of inaccurate entries simplifies the data management process, avoiding the need for complex manual intervention while maintaining high measurement precision.
3Ease of operation
If the system waits for GNSS position fix to become available before deleting path history entries, then the operation is simpler, but the time delay increases
Solution Approach 1:
The system performs preliminary deletion of path history entries as soon as GNSS position fix becomes unavailable, rather than waiting for a future condition. This proactive approach eliminates time delays associated with waiting for position fix restoration, while the automated feedback mechanism keeps the operation simple by handling the entire process without manual intervention.
Data Source
AI summary
A method for broadcasting a basic safety message (BSM) packet from a host vehicle includes storing at least one path history entry of the host vehicle. The method includes determining whether a global navigation satellite system (GNSS) position fix is available. The method includes performing a corrective action on the at least one path history entry in response to the GNSS position fix not being available. The method includes, in response to the GNSS position fix being available, calculating a path history entry to be stored among the at least one path history entry based on the GNSS position fix. The method includes generating and broadcasting the BSM packet based on the at least one path history entry.