RFID tag parameter determination using phase

The RFID tag reply phase measurements may be used to estimate tag position and motion. Phase measurements may be used to directly calculate tag position/motion or to generate correlation probabilities with candidate tags having different position/motion characteristics. An RFID reader system may make multiple phase measurements for a tag at different carrier frequencies within a single inventory round to ensure that the tag remains within the range of the reader system. RFID标签答复相位测量可用以估计标签位置和运动。相位测量可用以直接计算标签位置/运动或产生与具有不同位置/运动特性的候选标签的相关概率。RFID读取器系统可在单个盘存轮次内在不同载波频率下针对标签进行多个相位测量，以确保所述标签保持于所述读取器系统的范围内。