Method for tracking and locating container by adopting label sensor network

Abstract

At present, an RFID (Radio Frequency Identification Device) technology is used in the container physical distribution process, however, the application of the RFID technology in the field of container physical distribution tracking and locating is limited due to defects and limitations of an RFID per se. The invention provides a method for tracking and locating a container by adopting a label sensor network, and in the method, the sensor network is fused with an RFID network, so that transmitting various types of radio frequency label data is realized by a ZigBee network through gateway level design, hardware module design, protocol fusion and the like. By using the label sensor network, the transmission radius of the traditional RFID network is increased, and a series of problems such as incapability of sensing object states, poor an-interference performance and the like of the RFID are solved. Positional information of the container is calculated through a subtriangular inner pointer testing algorithm. Relevant information such as a position, a safety condition, humidity and temperature change and the like of the container can be gotten by a shipper or manager through a computer and a mobile phone, and once unforeseen circumstances such as container damage, transportation line change or delay and the like happen, alarm information can be received in time.

Description

technical field [0001] The invention relates to radio frequency identification technology and wireless sensor network technology. By combining them organically to form a label sensor network under the Internet of Things environment, and based on this, a container logistics tracking and positioning method is realized, which belongs to wireless sensing and radio frequency technology and The intersection of modern logistics management technology. Background technique [0002] With the further acceleration of economic globalization and the rapid development of international trade, container transportation has become an important form of transportation modernization due to its high efficiency, convenience and safety. 90% of international freight is completed through container transportation. Since the container itself does not carry information in the current container logistics process, the flow direction, circulation and identification of containers are basically still in a man...

AI Technical Summary

Problems solved by technology

Although the container logistics information transmission network has been generally realized at present, there are still many problems, mainly as follows: First, the cargo owner, freight forwarder, and shipping agent only know that the container is currently "on the road or on the ship" during the logistics transportation process. It is difficult to obtain the status information and location information of the container; in the container monitoring system based on RFID technology, the radio frequency electronic tag can only store some basic information of the object itself, and the system cannot obtain the change information between the object state and its environment through the tag; The second is that the active RFID network used for long-distance identification has certain requirements for the direction and position of the RFID tag and the direction of the reader antenna during the installation process, and the existing RFID reader network is generally established on the basis of a wired network , these all limit the flexibility of the system; third, in large objects that need to move frequently, RFID technology has the problem of reading and writing distance, only by increasing the transmission power, not only the cost is increased, but also when the transmission frequency When it is too large, it may cause harm to the human body

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