摘要
针对室内无线区域定位的需求,设计了基于有源RFID(Radio Frequency Identification)技术的无线定位系统。RFID读写器和标签系统均采用低功耗MCU芯片PIC16F877A作为核心控制单元,以低功耗无线射频收发器芯片CC2500为核心配合外围滤波器和天线等构成系统的通信单元。在读写器与标签进行数据通信的过程中,通过获取RSSI(Received Signal Strength Indicator,接收信号强度指示)信号推测出读写器与标签之间的距离,在获得来自于多个具有固定位置信息的标签的RSSI信号后,可以实现对读写器的无线定位。实验结果表明,该系统在室内环境中能够实现较高精度的无线区域定位。
Aming at the demand of indoor wireless area locating,a kind of wireless locating system based on active RFID technology was designed.The ultra-low power consumption MCU chip PIC16F877A was adopted as the core control unit for the reader and tag system,the communication unit consists of the core RF transceiver chip CC2500 which is ultra-low power consumption with the external filters and the antenna.RSSI（Received Signal Strength Indicator） can be obtained in the process of communication between reader and tags.According to the changes of RSSI during the reader moving,the distance between reader and tags can be predicted.When more signals of RSSI obtained from more fixed tags,the reader can be located by these wireless signals.Experiment result shows that the wireless locating system can get a fine locating precision in the common indoor environment.
出处
《电子设计工程》
2011年第15期50-53,共4页
Electronic Design Engineering
基金
上海海事大学科研基金项目资助(20110036)
上海市教育委员会重要学科建设项目资助(J50602)
上海市科委重点科技攻关专项资助(09511503400)
