提出了一种基于PIC16F877A微控制器和CC2500射频收发器芯片的低功耗、低成本RFID（Radio Frequency Identification，无线射频识别）局域定位系统设计方法，介绍了系统的定位工作原理、主要硬件电路模块及定位算法的设计和实现。采用基于序列号对时隙数运算的排序算法有效解决了多标签识别碰撞的问题，基于射频辐射强度（Received Signal Strength Indication，RSSI）和圆周定位算法实现了基于RFID多标签系统的平面定位。实验测试表明，这种射频定位方法能够实现一定精度下的无线局域定位的功能。%A lower power consumption and cost RFID （Radio Frequency Identification） regional positioning system based on microcontroller PIC16F877A and transceiver cc2500 was proposed in this paper. The operational principle of positioning, main hardware modules and positioning algorithm are all introduced. The method of sorting algorithm based on operations of serial number to the number of time slots can solve the problem of communication collision of muhi-tags effectively. Plane positioning of multi-tags of RFID system was achieved by Received Signal Strength Indication （RSSI） and the circle positioning algorithm. The experiment illustrates that this kind of radio frequency positioning method can be well applied to wireless regional positioning under a certain accuracy.
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