The Research On The Localization Technology Of RFID Sensor Networks

RFID Sensor Networks have great prospect in the applications of military affairs, circumstance observation, disaster relief operation, dangerous area domination, etc. One of the key qualifications for these applications is localization of the targets needed monitoring and the network node. And some routing scheme, information of network coverage, load balance, topology control, all of which depend on the location information of the nodes in networks. All these indicate that localization is a fundamental and critical issue for the application, operation and management of RFID Sensor Networks. The study for self-positioning of RFID Sensor Networks possesses great significance in the theory and practice, and it will become an important part in the research area.In the recent in: vestigation the location technology can be divided into two categories range-based approaches and range-free approaches. Range-based methods have better accuracy, but require additional hardware at the sensor nodes, which are not available on regular application fort of RFID Sensor Networks. Because of the hardware limitations of RFID Sensor Networks devices, solutions in range-free localization are being pursued as a cost-effective alternative to more expensive range-based approaches. The range-free algorithm makes no assumption about the availability or validity of range information. In allusion to the special self-organizing network RFID Sensor Networks, range-free will be abroad attented.Supported by the Research on key Technology of RFID Sensor Nteworks (The National Natural Science Foundation of China (No: 60673132)) , the Research on RFID Sensor Networks and its Application Technology (Guangdong Natural Science Foundation(No:07117421)), the dissertation explores RFID Sensor Networks, basic research on RFID Sensor Networks: Consist of RFID Sensor Networks and Architecture of RFID Sensor Networks. Primary reaearch: Range-free localization algorithm-Amorphous Algorithm. Based on Amorphous, DL-Amorphous and the Amorphous Algorithm of elimination three beacon nodes are put forward. The simulation results indicate that DL-Amorphous has good localization performance, high localization accuracy, high localization coverage. But DL-Amorphous Algorithm doesn't considerate that three beacon nodes in line , it can cause ambiguous location. The Amorphous Algorithm of elimination three beacon nodes in line solves the problem which the DL-Amorphous Algorithm of three beacon nodes, and the Amorphous Algorithm of elimination three beacon nodes has high localization coverage, high packets commucation cost.