施工升降机点式定位关键技术研究

摘要

研究施工升降机准确定位问题.由于施工升降机在工作过程中不稳定,使用超高频RFID标签识别技术时,一旦标签发送频率过高,在信道容量不变的情况下,很容易产生信道抢占.传统的时间轮转片的防标签冲突算法在施工升降机高频发送标签状态下,时间片需要变得极其微小才能满足要求,导致冲突调节效果不好,从而降低了定位的准确性.为了避免上述缺陷,提出了一种超高频RFID的施工升降机点式定位方法.利用标签时隙估计方法,对单位时间内信道中超高频RFID的标签数目进行估计,为信道中标签的防冲突运算奠定数据基础.利用标签搜索方法,计算信道中标签冲突的概率,从而实现超高频RFID标签防冲突运算,在信道中的标签不出现冲突的情况下,完成施工升降机的点式定位.实验结果表明,利用改进算法进行施工升降机点式定位,能够有效提高定位的准确性.%Approaches to the study of construction lifter accurate positioning. This paper put forward a construction lifter based on uhf RFID point positioning method. A labels time estimate method was used to estimate the number of uhf RFID tags in unit time channel and establish the data basis for label anti - conflict computing. A tag searching method was used to calculate the label conflict probability, so as to realize uhf RFID tag anti - collision algorithm , and the point positioning of construction lifter was completed under the condition of no tag coflict appears in the channel. The experimental results show that the algorithm can effectively improve the accuracy of point positioning.