This paper mainly researched the application of TDR and FDR techniques in the intelligent maintenance of communication line. The detection and localization of communication line based on TDR and FDR techniques were detailed analyzed when disconnection fault, short-circuit fault, line bridges and other anomalies happened. Then TDR and FDR techniques were compared for user to select. After actual verification, TDR and FDR techniques can well satisfy the needs of field application. They have great application value.
To prolong network lifetime, lifetime maximization routing based on genetic algorithm (GALMR) for wireless sensor networks is proposed. Energy consumption model and node transmission probability are used to calculate the total energy consumption of nodes in a data gathering cycle. Then, lifetime maximization routing is formulated as maximization optimization problem. The select, crosss, and mutation operations in genetic algorithm are used to find the optimal network lifetime and node transmission probability. Simulation results show that GALMR algorithm are convergence and can prolong network lifetime. Under certain conditions, GALMR outperforms PEDAP-PA, LET, Sum-w and Ratio-w algorithms.
Currently, the algorithms for wireless sensor networks which are applied in the field of intelligent transportation use NS2, Matlab software to simulate. The theoretical research results remain a certain distance from their applications in practical system. In order to solve the problem, the simulation platform in city traffic environment based on TinyOS for wireless sensor networks is researched. The structural framework of simulation platform in city traffic environment which is composed of vehicle nodes, relay nodes and sink nodes is proposed. Four design steps of application program and five simulation steps which are composed of simulation compile, network configuration, python simulation, data statistics and simulation result analysis are proposed. CTP protocol and three different movement scenes are used to test and verify the platform. Experimental results show that the algorithm performances with different parameters are obtained, and the simulation platform can verify the algorithms of wireless sensor networks in city traffic environment. The simulation platform combines theory simulation and practical application. It provides a simulation platform for the research on intelligent traffic algorithms, and shortens the algorithm development time.
Amount of cars in China increase rapidly with the fast development of social economy. Traffic jam and accidents have been social problems. Vehicle networking technology is born at the right moment for improving traffic situation and realizing city traffic intellectualization. Wireless access technology has become research hotspot in recent years under the vehicle networking environment. It is of great importance for wide use of vehicle networking to study rational and feasible safety information transmission plan. How to lower time delay of information and data redundancy is a big problem that has to be solved. This paper studied the multi-channel transfer of safety information in MAC layer to opti mize time delay and reliability of information transfer, which have certain value on the development of multi-channel transfer technology of vehicle networking safety information.
Vehicle networking is an important part of intelligent traffic system. It combines wireless sensor network and mobile autonomous network, which is better for drivers to obtain road condition information to ensure driving safety. This paper focuses on the analysis of subtractive clustering and proposed clustering routing algorithm based on subtractive clustering in order to reduce communication of wireless sensor network and redundant flooding and routing expanse. In the algorithm, cluster head selection adopts subtractive clustering to produce cluster node in node intensive place. Cluster forms by adopting current non cluster head node mechanism which reduced energy consumption. Then the maintenance method of cluster is proposed. At last, it introduces routing protocol of cluster which is easier for clustering structure to manage and synchronize network.
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