外文翻譯---基于無線傳感器網(wǎng)絡技術的運輸網(wǎng)絡智能引導及控制系統(tǒng)-文庫吧
2025-04-17 10:09 本頁面
【正文】 m. Section 3 describes the optimization algorithm for the traffic work. The simulation results and some discussions are presented in Section 4. Finally, Section 5 concludes this paper. 2. System Structure . WSN Module WSN module is a basic ponent in our traffic control system. As illustrated in Fig. 1, a WSN module prises of 3 main ponents, ., RF (Radio Frequency), MCU (Micro Control Unit) and Power Supply. The RF encodes, modulates and sends the signal. Also it receives, decodes and demodulates the signal as well. MCU integrates processor and memories, where the programs resides and executes. The Power Supply supplies the power to entire module. In the proposed system, WSN modules are widely distributed on vehicles, roadsides and intersections to collect, transfer and analyze the traffic information. See section for details. . Urban Traffic Network Several different facilities are installed in the urban traffic work to perform their specific functions. For example, the Signal Lights are installed in the road intersection to directly control the vehicle through the intersection。 the Variable Message Sign (VMS) is set up along the road side to help drivers to select the optimal route。 the Navigation system (electronicmap and satellitebased positioning system) is installed in the vehicle for vehicle locating and navigation. The target of an ITS is to optimize the traffic in a transportation work by controlling the signal lights in the intersections, by providing the accurate traffic information in the VMS, or by selecting the best route in the emap. To perform the traffic control, below, we shall first have a look at the configuration of the transportation work. Then, some parameters are introduced to describe traffic information in the work. By optimizing these parameters, the proposed optimization algorithm is expected to optimize the traffic in the transportation work. As a example of a reallife traffic work, Fig. 2 illustrates the road of Fukuyama city [11]. On the figure some parameters such as the link length, lane numbers, and legal speed are marked on it. In this paper, we consider the traffic system that contains 3 types of basic elements, ., intersection (N), Link (L) and Vehicle (V). An Intersection can be described by 2 parameters: 1) the phase type (the type of the vehicles on different lanes passing through the intersection simultaneously)。 2) the duration of every phase. A Link can be described by 4 parameters, ., the link length, lane numbers (include every turningdirection), mean speed, vehicle number. A Vehicle can be described by 5 parameters. They are: 1) the location of the vehicle, 2) the vehicle velocity, 3) the origin, 4) the destination, 5) the length of the route, 6) the total time and, 7) the average speed on the route. Among these parameters, 1) some are fixed, such as the lane numbers and link length。 2) some are measured by the surveillance subsystem, such as the mean speed, the number of the vehicles on a link。 3) some are set by an optimization algorithm, such as the intersection signal light and the next link selected by a vehicle. The vehicle velocity, direction, and the number of the vehicles are the basic variables of the whole system. It is the main task of our algorithm to optimize these parameters. . Data Collection and Transferring As illustrated in Fig. 3, there are 3 types of WSN nodes installed in our system, ., the vehicle unit on the individual vehicle。 the roadside unit along both sides of the road。 and the intersection unit on the intersection. The main function of intersection unit is to receive and analyze th
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