实时定位系统中的扩频RFID标签设计与实现

Design and implementation of spectrum-spreading RFID tag in TDOA positioning system

描述了1种运用扩频体制的RFID到达时间差实时定位系统的工程实现方案,设计了1种扩频RFID标签,使得标签的位置信息可以由本定位系统实时地计算出来。给出了标签的总体架构、工作原理以及关键元器件的外围电路和参数设置。标签以Z87200数字扩频调制解调芯片为扩频核心,使用MSP430F449超低功耗单片机进行控制,运用AD8346直接正交上变频器进行信号调制以使系统可以应用于ISM波段。此设计不仅可以应用于物流管理,也可以作为通用的扩频信号发送器。

The design of an engineering implementation of TDOA positioning system with spectrum-spreading function and one kind of spectrum-spreading RFID tag used in the system is put forward.In this system,the coordinate of tag can be figured out in real time.The architecture and principle of the tag are described;also the peripheral circuits and arguments setting of key components are presented.This tag mainly consists of Z87200 spread-spectrum transceiver as the spectrum-spreading core,MSP430F449 mixed signal microcontroller as the system controller,and AD8346 Quadrature Modulator which up-converts the signal to ISM band.This design can be applied not only in logistics management,but also as the general spectrum-spreading signal transmitter.