根据定向阅读器波瓣图的特征,使用步进电机以恒定的角速度驱动UHF-RFID阅读器进行旋转.阅读器扫描覆盖区域内所有的标签,通过计算每个标签的发现时间和失去标签的到达时间差,计算出标签和阅读器之间的到达角数据,推算出标签以阅读器为中心的直线方程；同时结合阅读器旋转的弧度推算出标签所在圆方程轨迹,估算出阅读器的位置坐标.定位系统中只使用两个定向阅读器和若干标签,降低了定位系统的成本和系统的复杂度,提高了定位的精度和效率.%An UHF-RFID directional reader is drived by a step motor to whirl with a constant angular, which depends on the lobe pattern for it's directional characteristic. And all tags in the area covered by the reader are scanned to obtaining the TDOA between found-time and loss-time, thus, AOA can be caculated to make the linear formulation between the tags and reader in axis. The coordiante of every tag can be estimated by using the trajectory of every tag in accordance with it's circle formulation and the radian that the reader has been whirled. In the location system, only two directional readers are in work with some tags, which reduces the complexity and enhances it's accuration and efficiency.
展开▼
