信息技术.品项管理的射频识别.第64部分:860 MHz到960 MHzD型空中接口通信用参数

[中文适用范围]： 本部分ISO/IEC 18000定义了在860 MHz至960 MHz工业、科学和医疗（ISM）频段中用于物品管理的射频识别（RFID）设备的空中接口。它为可用于开发RFID应用标准的ISO委员会提供了RFID设备的通用技术规范。本部分ISO/IEC 18000旨在允许兼容性并鼓励国际市场上日益增长的RFID市场的互操作性。它定义了技术属性的前向和反向链路参数，包括但不限于：工作频率、工作信道精度、占用信道带宽、最大有效全向辐射功率（EIRP）、杂散发射、调制、占空比、数据编码、比特率、比特率精度、比特传输顺序，以及在适当情况下定义的工作信道、跳频速率、跳频序列、扩频序列和码片速率。它还定义了空中接口中使用的通信协议。本部分ISO/IEC 18000规定了无源后向散射、仅在被监听后发言（TOTAL）RFID系统的物理和逻辑要求。该系统由 interrogation 器（也称为阅读器）和标签（也称为标签）组成。Interrogator 向标签发射连续波（CW）射频信号；标签通过调制其天线的反射系数来响应，从而将信息信号后向散射回 Interrogator。该系统是 TOTAL 的，意味着标签在进入 Interrogator 场后，首先监听 Interrogator 调制以确定系统是否为 ITF，然后调制其天线反射系数以携带信息信号。详细而言，本部分ISO/IEC 18000包含 Type D。Type D 基于脉冲位置编码或 Miller M=2 编码的子载波的 TOTAL。本部分ISO/IEC 18000规定了：Interrogator 和标签之间的物理交互（通信链路的信令层）；Interrogator 和标签的操作程序；用于在多个标签环境中识别特定标签的冲突仲裁方案。 [外文原描述]： ISO/IEC 18000-64:2012 defines the air interface for radio frequency identification (RFID) devices operating in the 860 MHz to 960 MHz Industrial, Scientific, and Medical (ISM) band used in item management applications. It provides a common technical specification for RFID devices that can be used by ISO committees developing RFID application standards. It is intended to allow for compatibility and to encourage inter-operability of products for the growing RFID market in the international marketplace. It defines the forward and return link parameters for technical attributes including, but not limited to, operating frequency, operating channel accuracy, occupied channel bandwidth, maximum effective isotropic radiated power (EIRP), spurious emissions, modulation, duty cycle, data coding, bit rate, bit rate accuracy, bit transmission order, and, where appropriate, operating channels, frequency hop rate, hop sequence, spreading sequence, and chip rate. It further defines the communications protocol used in the air interface. ISO/IEC 18000-64:2012 specifies the physical and logical requirements for a passive-backscatter, Tag Only Talks After Listening (TOTAL) RFID system. The system comprises Interrogators, also known as readers, and tags, also known as labels. An Interrogator receives information from a tag by transmitting a continuous-wave (CW) RF signal to the tag; the tag responds by modulating the reflection coefficient of its antenna, thereby backscattering an information signal to the Interrogator. The system is TOTAL, meaning that a tag modulates its antenna reflection coefficient with an information signal upon entering an Interrogator's field after first listening for Interrogator modulation in order to determine if the system is ITF or not. ISO/IEC 18000-64:2012 contains Type D. Type D is TOTAL based on Pulse Position Encoding or Miller M=2 encoded subcarrier. ISO/IEC 18000-64:2012 specifies physical interactions (the signalling layer of the communication link) between Interrogators and tags, Interrogator and tag operating procedures, the collision arbitration scheme used to identify a specific tag in a multiple-tag environment.