The Dynamic Composition Technology Of Transportation Information Based On Situation Calculus

With the continuous improvement of informatization, and the development of the transportation information service, the users’ travel demand variety. In order to be better meet the demand of traffic information service for the users’ travel situation. The dynamic composition and distribution technology of transportation information based on situation calculus under the environment of car networking is studied in the paper.Firstly, in this paper, it analyzes the concept and characteristics of transportation information service coordination. Transportation information service coordination collects transportation information data that is distributed in different physical transportation equipment under network environment to coordinate, integrate and process information and equipment resource in transportation system, so as to reach the goal of providing comprehensive transportation information service for travelers, and trying to accomplish the high efficiency and good order in the entire process. In order to realize the data unification process, a service description language OWL-S is analyzed, which is used for the ontology modeling of transportation information service, so as to support and construct the knowledge base and situation base for the field of transportation information service.Secondly, several typical service combination methods are analyzed in the paper. Then a dynamic combination system that is based on situational calculus for transportation information system is designed based on the service-oriented mode. The system adopts the coordination mode of car networking for the transfer, match, combination and release of information. By query matching in the knowledge base of transportation information service to acquire the logic relation among services through inference e ngine according to the real- time situational transportation data, and then make combination of dynamic services and release the information. This kind of service mode that has context awareness can monitor the traveler, vehicles, transportation setting and environment information in real time, and use reasoning algorithm to provide individualized service support for the traveler.At the end of the paper, the knowledge base and situational base that are established can be used to support the dynamic updating of situational base. Establish the ontology model for transportation information service and design dynamic combination system for transportation information service and carry out simulation verification.In this paper, the combination and distribution technology of transportation information service has realized many functions, such as the description of transportation information service, context awareness, intelligent deduction and combination etc, which can ensure more accurate and prompt going-out experience of users and improve the quality transportation information service.