Sensor-network-based geomagnetic induction vehicle clock synchronization technology

Abstract

The invention provides a sensor-network-based geomagnetic induction vehicle clock synchronization technology. A mobile base station, the Internet, a gateway and a ZigBee sensor network are applied to the technology. The technology includes the steps that (1) geomagnetic sensors are deployed, wherein the geomagnetic sensors are deployed equidistantly on all lanes; (2) a topological structure is established at the stage; (3) synchronization is achieved; (4) speeds and lengths of passing vehicles are calculated. The technology has the advantages that by means of the synchronization technology, the speeds of the traveling vehicles can be measured, and information of the overspeed vehicles can be fed back to a foreground in time, so that intelligent control and management of the vehicles are facilitated; meanwhile, full preparation is made for subsequent work, for example, if an illegal vehicle needs to be photographed, related information can be transmitted to a corresponding node for processing, and therefore manual intervention is greatly relieved.

Description

technical field [0001] The invention relates to an intelligent control system, in particular to an intelligent street lamp control system based on a GPRS mobile network and a ZigBee wireless sensor network, which belongs to the fields of mobile networks, wireless networks and embedded systems. Background technique [0002] With the extensive application of wireless networks in various fields, wireless network technology has been promoted and applied to smart street lights. At home and abroad, there have been some research and development work on wireless vehicle detectors based on geomagnetic induction. For example, the research results of Su Donghai and others can realize whether a vehicle passes by, the direction of travel, and can estimate the speed of the vehicle, which has certain practicality. However, since the design scheme assumes that the speed of the vehicle passing the detector is constant (that is, a constant speed), and in the actual traffic scene, the vehicle ...

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Problems solved by technology

Another example, Hyunhak Kim's cluster-based synchronization algorithm, first divides the system into high-performance and low-performance nodes according to different performances, then builds spanning trees for different types of nodes, and then synchronizes the two types of spanning trees respectively , this method can certainly improve the accuracy of synchronization, but it is more difficult to achieve from a practical point of view

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