United States Department of Transportation
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TRIS Online Accession Number:01649671
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Edition:Final Report
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Abstract:Vehicle convoys (platoons) hold a promise for significant efficiency improvements of freight and passenger transportation through better system integration. Through the use of advanced driver assistance, vehicles in a convoy can keep shorter distances from each other, thus decreasing energy consumption and traffic jams. However, reliable and low-latency communications are a vital prerequisite for such systems. The standard for Vehicle-to-Vehicle (V2V) wireless communications is IEEE 802.11p, and its performance for communication between passenger cars has been widely explored. However, there are hardly any results about the performance of such systems when both trucks and passenger cars are present. In order to remedy this situation this research conducted extensive measurement campaigns of the propagation channel between cars and trucks, and between cars whose connection is blocked by trucks. These scenarios are clearly of great importance for mixed-traffic convoys, yet have not yet been explored or measured in the open literature. For that purpose antenna arrays were constructed in order to characterize the double directional characteristics of the underlying propagation channel, as well as a wide band and directional channel sounder with high precision synchronization based on software defined radio platforms. The measured data are then used as the inputs of a IEEE 802.11p communication system simulator, which tells us not only the probability of successful communication between vehicles but also helps to analyze robust methods such as multi-hop to resolve the situations where direct communications are not successful. Its outputs constitute an important input for the design of convoy policies, enhanced automated driver assistance, and even self-driving cars.
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