Topological constraints based 3D localization method of RFID tags

The existing three-dimensional localization method for RFID took a large operation time complexity and collected amount of information.It impacted the efficeiency of location greatly and could not meet the requirements of RFID real-time location system.To solute this problem,this paper proposed a topological constraints based 3D localization method of RFID tags.Combined virtual landmarks with defined topological constraints to localize tags.Applied arelaxation parameter to reduce the impact of reading and writing errors,and increasing the positioning accuracy at the same time.Simulation results show that when the interval of static reader has being set 6 m with additional mobile readers,the positioning accuracy is within 0.4 m,about 12% of the interval for readers,while positioning accuracy of the system in traditional LANDMARC is about 50%,that means the algorithm accuracy has been improved more than 6 times.