6ES7332-5HD01-0AB0
6ES7332-5HD01-0AB0
6ES7332-5HD01-0AB0
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速度就意味着生产量:生产量越高,资金和人力资源的使用效率就越高。由于无源标签从RFID阅读器获得它们正常工作所需的能量,多个阅读器可能导致标签试图对询问它的每一个阅读器都进行响应。在多阅读器情况下,为改善系统的吞吐量需要使用某种防冲突协议。最后,为最大化标签的读取范围,载波对噪声(carriertonoise)的要求应当最小化,但是这可能与通过最小化载波的不工作时间以防止标签耗尽能量的需要相冲突。这些优化措施对工程师和测量设备提出了挑战。
让我们看一个具体的例子——优化通信速度,也称为翻转时间TAT(以下简称TAT)。可用的RF能量、路径衰落和经过更改的符号速率能延长标签对阅读器查询的响应时间。响应越慢,读取多个标签所花费的时间就越长。快速测量TAT对优化RFID系统的速度是非常必要的。
使用RTSA可以很容易地测量TAT。首先,需要安装一个频率模板触发器以获取标签与阅读器之间的整个查询。RTSA的功率与时间关系视图使用户能够观看整个发射过程。习惯认为一个下行链路传输(由阅读器到标签)结束到下一个下行链路传输开始之间的时间就是半双工系统的TAT。将一个标记放在标签询问的结束点,第二个δ标记置于反向散射的结束点或下一次阅读器进行数据发射的开始点,就可以精确测量出TAT时间。在大范围下行链路的条件下维持最短的TAT将有助于系统吞吐量的最大化。
RTSA也能解调与标签查询相关的符号或比特。用户只需选择相应的RFID标准、调制类型和解码格式。分析仪能自动检测并显示链路的比特率。为进一步提高工程师的生产效率,对恢复出的数据符号进行了基于功能的颜色编码(color-coded)。RTSA能够自动识别前导符并将那些符号染成黄色。这易于识别实际的数据负荷并与已知值进行比较。
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