CN116187357A - 一种rssi融合双rfid标签机场行李定序的方法 - Google Patents
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Abstract
本发明公开一种RSSI融合双RFID标签机场行李定序的方法,属于智能制造中的无线定位技术领域。本发明通过安装在机场行李提取转盘轨道上的超高频RFID阅读器,对经过的所有的贴有双RFID标签的行李进行定序,方便旅客对行李的提取,在本发明中双RFID标签贴在任意两个对立面上,这样能够避免单RFID标签因方向、遮挡等问题导致的漏读问题,此外,RFID阅读器通过分析行李两个RFID标签识别时的RSSI值的变化,分析出行李通过阅读器的时间,以此确定行李的在转盘上的顺序,本发明降低了标签漏读问题、提高了行李定序的准确度,这保护了旅客的公共利益。
Description
技术领域
本发明属于智能制造关键技术无线定位技术领域,特别是涉及一种RSSI融合双RFID标签机场行李定序的方法。。
背景技术
RFID技术是一种自动识别技术,可远距离、翻越障碍物识别物品,然而当距离过远或障碍物为高密度材料,RFID阅读器可能会丢失该物品。原有机场行李定序技术多采用单RFID标签方式,因为高密度材料(如金属等)遮挡等问题,物品上的RFID标签可能不会被识别,造成标签的丢失。此外由于单标签的摆放角度的因素,使得不同距离的RSSI值可能是相同的,这造成了定序的错误。
经现有文献检索发现,中国专利公开号CN111144517A,公开日2020年5月12日的专利申请公开了一种基于超高频RFID的物品定位方法及其装置,该技术基于单个UHF的RFID标签,这容易导致物品的漏识别现象,此外,该发明的RFID阅读器只对标签第一次被读入和最后一次被读取时的时间信息做分析,当传输带上的行李比较密集时,它的定位技术估计会出现不少错误。
发明内容
本发明的目的在于提供一种RSSI融合双RFID标签机场行李定序的方法包括,该方法通过给行李任意两个对立面贴上超高频RFID标签,避免行李RFID标签的漏读,此外,通过使用强RSSI值的RFID标签作为定序标签,使得机场行李定序的准确性大幅度提高。
为了实现上述发明目的,本发明采用以下技术方案:
一种RSSI融合双RFID标签机场行李定序的方法,包括如下步骤:
(S1)待定序的行李在任意两个对立面贴上UHF标签。可以是行李的左右面或前后面或者上下面。把这两个RFID标签和行李进行绑定。这样当其中一个面被高密度材料遮挡不能被识别时,它的对应面也可以被识别;
(S2)获取每个行李RSSI值的时间序列。当行李通过RFID阅读器时,记录下每个RFID标签被识别的时间、RSSI值和EPC号,这样在一段时间内可以获得一个时间序列,在该序列中,每个元素是个三元组(time,epc,rssi)。epc是RFID标签的电子标签号,time是epc被读取时的时间,rssi是epc被读取时的RSSI值。
(S3)优化每个行李RSSI值的时间序列。上一步骤中获得的行李时间三元组序列,每0.1秒作为一个时间段,每个时间段的三元组至多保留一个,这有3种情况,第一种情况,0.1秒内没有标签被识别,该0.1秒的三元组数据就为空;第二种情况,0.1秒内有一个行李标签被识别,保留该RFID标签的三元组;第三,0.1秒内有多个标签被识别,保留RSSI值较大的三元组,这样得到了一个优化了的行李RSSI值时间序列。优化的RSSI值时间序列是边识别边。
(S4)确定行李通过RFID阅读器的时间。当一个行李的两个标签被识别后3秒内没有被再次识别就可以认为该标签离开了RFID阅读器的信号区,此时,对该行李优化的RSSI值时间序列的时间和RSSI进行分析,这有两种情况,第一种情况,时间和RSSI的关系近似为“去底边的等腰三角形”,顶角所在顶点(RSSI最大值)对应的时间就是行李正好位于阅读器下方的时刻;第二种情况是时间和RSSI的关系近似为“去下底的等腰梯形”的关系,上底的中点就是行李正好位于阅读器下方的时刻。以此方法可以知道所有通过阅读器行李的顺序排列;
进一步地,所述步骤(S2)阅读器记录下每个RFID标签被识别的时间,时间精度需要精确到0.01秒,因为在本发明中,需要统计每隔0.1秒内RFID标签被识别的时间。
进一步地,所述步骤(S3)阅读器优化每个行李的RSSI值时间序列,每个行李拥有一个优化的RSSI值时间序列。
进一步地,所述步骤(S4)时间和RSSI关系分析中的两种关系“去底边的等腰三角形”和“去下底的等腰梯形”只是RSSI值在时间轴上的近似关系,即这些关系带有随机波动。
与现有技术相比,本发明的有益效果是:
1)现有的技术标签丢失的概率要大,本发明在行李两对立面贴上标签,几乎能达到0标签丢失率。
2)原有的技术没有采用双标签技术,行李定序的错误的概率较高,而采用本发明可以大幅度降低行李定序错误的概率。
附图说明
图1行李通过RFID阅读器期间的时间和RSSI关系图。
具体实施方式
下面将结合本发明的附图,对本发明的技术方案进行清楚完整地描述。
一种RSSI融合双RFID标签机场行李定序的方法,包括如下步骤:
(S1)待定序的行李在任意两个对立面贴上UHF标签。在图1的行李1上,两个RFID标签贴在行李的上下面;行李2上,两个RFID标签贴在行李的左右面;行李3上,两个RFID标签贴在行李的前后面;由此可以看出,行李上的两个RFID标签至少有一个在经过阅读器时能够有效接收到阅读器的电磁波,这样能有效避免了RFID标签的漏读。
(S2)获取每个行李RSSI值的时间序列。当行李通过RFID阅读器时,记录下每个RFID标签被识别的时间、RSSI值和EPC号,这样在一段时间内可以获得一个时间序列,在该序列中,每个元素是个三元组(time,epc,rssi)。epc是RFID标签的电子标签号,time是epc被读取时的时间,rssi是epc被读取时的RSSI值。
(S3)优化每个行李RSSI值的时间序列。上一步骤中获得的行李时间三元组序列,每0.1秒作为一个时间段,每个时间段的三元组至多保留一个,这有3种情况,第一种情况,0.1秒内没有标签被识别,该0.1秒的三元组数据就为空;第二种情况,0.1秒内有一个行李标签被识别,保留该RFID标签的三元组;第三,0.1秒内有多个标签被识别,保留RSSI值较大的三元组,这样得到了一个优化了的行李RSSI值时间序列。优化的RSSI值时间序列是边识别边。
(S4)确定行李通过RFID阅读器的时间。当一个行李的两个标签被识别后3秒内没有被再次识别就可以认为该标签离开了RFID阅读器的信号区,此时,对该行李优化的RSSI值时间序列的时间和RSSI进行分析,这有两种情况,第一种情况,时间和RSSI的关系近似为“去底边的等腰三角形”,顶角所在顶点(RSSI最大值)对应的时间就是行李正好位于阅读器下方的时刻,这种情况如图1的行李1和行李3,它们经过阅读器正下方的时间就是RSSI值最大的时刻;第二种情况是时间和RSSI的关系近似为“去下底的等腰梯形”的关系,上底的中点就是行李正好位于阅读器下方的时刻,这种情况如图1的行李2,它经过阅读器正下方的时间是去下底等腰梯形上底的中间位置。以此方法可以知道所有通过阅读器行李的顺序排列。
以上所述仅为本发明的较佳实施例,并不用以限制本发明,凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。
Claims (3)
1.一种RSSI融合双RFID标签机场行李定序的方法包括:
(S1)待定序的行李在任意两个对立面贴上UHF标签,把这两个RFID标签和行李进行绑定。这样当其中一个面被高密度材料遮挡,它的对应面也可以被识别。
(S2)获取每个行李RSSI值的时间序列。当行李通过RFID阅读器时,阅读器会多次记录下每次RFID标签被识别的时间、RSSI值(接收信号的强度指示)和epc号,这样每个标签被识别后将得到一个三元组(time,epc,rssi),其中,time是RFID识别的时间,epc是RFID标签的电子标签号,rssi是RFID标签的接收信号的强度指示,因为每个行李贴有两个RFID标签,因此每个行李可以得到含两个RFID标签的时间三元组序列。
(S3)优化行李RSSI值的时间序列。上一步骤中获得的行李时间三元组序列,每0.1秒作为一个时间段,每个时间段的三元组至多保留一个,这有3种情况,第一种情况,0.1秒内没有标签被识别,该0.1秒的三元组数据就为空;第二种情况,0.1秒内有一个行李标签被识别,保留该RFID标签的三元组;第三,0.1秒内有多个标签被识别,保留RSSI值较大的三元组,这样得到了一个优化了的行李RSSI值时间序列。
(S4)确定行李通过RFID阅读器的时间。当一个行李刚离开阅读器信号区后,对该行李优化的RSSI值时间序列的时间和RSSI值进行分析,这有两种情况,第一种情况,时间和RSSI的关系近似为“去底等腰三角形”,则顶角所在的顶点(RSSI最大值)对应的时间就是行李正好位于阅读器下方的时刻;第二种情况,时间和RSSI的关系近似为“去下底的等腰梯形”,上底的中点就是行李正好位于阅读器下方的时刻。以此方法可以知道所有行李的顺序排列。
2.如权利要求1所述的一种RSSI融合双RFID标签机场行李定序的方法,其特征在于行李必须贴有2个UHF的RFID标签,这能有效避免行李丢失的问题。
3.如权利要求1所述的一种RSSI融合双RFID标签机场行李定序的方法,其特征在于行李刚离开阅读器信号区后是通过该行李两个RFID标签最后一次被识别后3秒内不再被识别来判断的。
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