Application of DGPS for Collision Avoidance in Intelligent Transportation Systems In a Wireless Environment

Oloufa, Amr A.; Aty, Mohamed A. · 2001 · ROSA P / Florida. Department of Transportation

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Summary

This research evaluates the viability of using Differential Global Positioning System (DGPS) technology coupled with wireless communications for collision avoidance in Intelligent Transportation Systems. The study was motivated by the high frequency of traffic accidents caused by collisions and the limitations of existing detection technologies, such as ultrasonic, infrared, radar, and vision systems, which often suffer from short ranges, high costs, or reliance on line-of-sight conditions. GPS offers a distinct advantage by functioning independently of line-of-sight constraints and utilizing Geographic Information Systems to distinguish between theoretical collision courses and actual physical barriers, such highway medians. The experimental design involved a hardware architecture comprising a mobile rover subsystem and a central server subsystem. The rover, installed in a vehicle, utilized a differential GPS receiver, a laptop, and a radio to transmit position data formatted according to the $GPRMC sentence. This data was sent via 900 MHz wireless communications to a PC-based server. The server software, implemented in Visual Basic, calculated potential collision scenarios by determining the intersection points of vectors defined by the GPS positions and bearings of the roving vehicle and a simulated vehicle. The algorithm compared the distance to the potential collision point against the required braking distance for each vehicle. If the braking distance approached the collision distance within a specified tolerance, the server issued a cautionary message back to the rover. The system was tested extensively on the University of Central Florida campus. The results demonstrated that the wireless communication routines achieved extremely fast response times, and the entire system, including real-time map display and vehicle tracking, functioned effectively. The study proved the technical viability of using GPS for collision detection and avoidance. However, the researchers identified significant challenges regarding scalability and system architecture. Specifically, the study highlighted the need to determine whether collision calculations should be performed on a central server or within each vehicle to manage computational loads and latency. Additionally, the research noted that current systems rely on driver reaction to warnings, which may be insufficient; future integration with automated braking and control systems is recommended to execute evasive maneuvers without operator intervention.

Key finding

The implemented DGPS and wireless communication system successfully detected potential collisions with a simulated vehicle and transmitted cautionary messages with extremely fast response times.

Methodology

lab_experiment

Provenance

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Summary generated by qwen3.6-27b-prismaquant on 2026-06-10; verification: verified.

Topics

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• nav systems