Patent Application
20100214116
1. Field of the Invention
The present invention relates to a location method and a location system thereof, and more particularly to an RFID location method and an RFID location system thereof.
2. Description of the Related Art
Radio Frequency Identification (RFID) is also called electronic tag or wireless radio frequency identification. RFID is a communication technology, which can employ wireless signals to identify specific objects and read/write relational data without forming mechanical or optical contacts with the specific objects. RFID can be applied into various fields, and a main decisive factor is the economic effect of this technology in those corresponding fields. The fields where this technology is applied, include: the anti-counterfeiting technology of money or product, the identification of identity card, pass, gate ticket, electronic toll collection system (such as easy-card), domestic animal or wild animal, the patient identification, the electronic medical record, and the logistics management, etc. The RFID technology can perform the production, transport, warehouse, distribution and sale of the commodity design, the material purchase, the semi-finished product, and the finished product. Furthermore, the RFID technology also can real-time monitor all links of the supply chain, such as the goods returning management and the after-sale service, and accurately grasp the relational information of products, such as manufacturer, production time, place, color, size, quantity, destination and recipient, etc. In the whole electronic commerce field, the RFID technology is other trend except two trends of the internet and the mobile communication.
Real-time location system (RTLS) mainly includes a plurality of methods for calculating distances and positions according to characters of wireless signals. For example, the RTLS includes the angle of arrival (AOA) method, the time of arrival (TOA) method, the time difference of arrival (TDOA) method and the received signal strength (RSS) method. The RSS method is firstly forming an attenuation model of transmitting signals in the environment. When a measuring point detects the signals, the RSS method determines a distance between the measuring point and a corresponding signal-emitting source according to the corresponding model and the strength of the signals. The RSS method can employ an intersecting point of distance circles from three measuring points to determine the position of the signal-emitting source. The RSS method of the above four methods is suitable for the indoor environment. The other three methods are greatly influenced by a problem of having many routes in the indoor environment, and the RSS method is little influenced by the problem of having many routes. Therefore, the RSS method can predict the change of the strength of the signals in moving, thus it has a high measuring precision of the measured position.
Middleware provides a software configured for connecting a system software and an application software to communicate those software easily. The middleware may be Tomcat of the Apache company, WebSphere of the IBM company, and Apusic of the Kingdee company, etc.
Database management system is a computer software system for managing databases to control the classification of the databases, and the read of the data. An exemplary database management system may be Oracel, Microsoft SQL Server, Access, MySQL and PostgreSQL, etc. Managers can employ the database management system to establish a database system.
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However, the conventional RFID location method and the location system thereof have disadvantages, which is the readers must employ networks to transmit the information to a back-end system (the computer) and network lines must be provided at building positions of the readers. Thus it will greatly increase a building cost and a complexity thereof, and prolong a building time thereof.
The present invention relates to a RFID location method configured for accurately locating a coordinate position of a RFID tag, which can solve the problem of the conventional technology.
The present invention also relates to a RFID location system configured for accurately locating a coordinate position of a RFID tag, which can solve the problem of the conventional technology.
A RFID location method in accordance with an exemplary embodiment of the present invention is configured for determining a coordinate position of a RFID tag, and the RFID tag can emit an identification information. The RFID location method comprises: providing at least three relay routers to correspond to the RFID tag; receiving the identification information and generating relay identification information having RSSI values by the relay routers corresponding to the RFID tag; transmitting the relay identification information from the relay routers to a reader; transmitting the relay identification information from the reader to a computer; employing a location algorithm method to calculate the coordinate position of the RFID tag according to the RSSI values of the relay identification information by the computer.
A RFID identification system in accordance with another exemplary embodiment of the present invention is configured for determining a coordinate position of a RFID tag, and the RFID tag can emit an identification information. The RFID location system comprises: at least three relay routers located to correspond to the RFID tag and configured for receiving the identification information to generate relay identification information having RSSI values respectively; a reader operatedly coupled to the relay routers for the relay routers transmitting the relay identification information to the reader; and a computer electrically coupled to the reader for the reader transmitting the relay identification information to the computer. The computer employs a location algorithm method to calculate the coordinate position of the RFID tag according to the RSSI values of the relay identification information.
These and other features and advantages of the various embodiments disclosed herein will be better understood with respect to the following description and drawings, in which like numbers refer to like parts throughout, and in which:
Reference will now be made to the drawings to describe exemplary embodiments of the present RFID location method and the system thereof, in detail. The following description is given by way of example, and not limitation.
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The RFID location method of the present invention employs an combination application of the received signal strength (RSS) method generally applied into the real-time location system and the location algorithm method generally applied into the GPS. The relay routers developed from the mesh architecture, are located between the conventional RFID tag and the reader. The RFID location method employs the relay routers to receive the RSSI values, and then calculates the coordinate position of the RFID tag by the location algorithm method. Therefore, the RFID location method of the present invention can greatly reduce the building cost thereof, and can real-time and accurately estimate the actual coordinate position of the RFID tag. Thus the present invention has a better effect and a better precision than the conventional technology which only employs the readers to locate.
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The above description is given by way of example, and not limitation. Given the above disclosure, one skilled in the art could devise variations that are within the scope and spirit of the invention disclosed herein, including configurations ways of the recessed portions and materials and/or designs of the attaching structures. Further, the various features of the embodiments disclosed herein can be used alone, or in varying combinations with each other and are not intended to be limited to the specific combination described herein. Thus, the scope of the claims is not to be limited by the illustrated embodiments.
| Number | Date | Country | Kind |
|---|---|---|---|
| 098105621 | Feb 2009 | TW | national |
