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    • 92. 发明申请
    • METHOD OF PREVENTING DATA COLLOSIONS IN BEACON-ENABLED ZIGBEE SYSTEM HAVING TREE ROUTING SCHEME
    • 在具有树路由方案的BEACON-EIBBLED ZIGBEE系统中防止数据聚合的方法
    • US20100110888A1
    • 2010-05-06
    • US12532826
    • 2007-10-24
    • Jongjun ParkJong-Oh LeeHoon JeongSun-Joong KimCheol-Sig PyoJong-Suk Chae
    • Jongjun ParkJong-Oh LeeHoon JeongSun-Joong KimCheol-Sig PyoJong-Suk Chae
    • H04L1/00
    • H04W74/0816H04W84/18
    • Provided is a method of preventing a data collision that occurs when two or more child nodes simultaneously transmit data to a parent node in a ZigBee network having a tree routing scheme and operating in a beacon mode. In the ZigBee system having the tree routing scheme and operating in the beacon mode, data communication to the parent node is performed in a beacon frame of the parent node. Here, when several child nodes exist under a single parent node, the child nodes transmit data to the parent node at the moment of receiving the beacon of the parent node, so that the data collision may occur when the child nodes simultaneously transmit the data to the parent node in the beacon frame of the parent node. In the method of preventing a data collision, each of the two or more child nodes is set to wait for its guard time (delay time) when transmitting data to the parent node to induce a normal slotted carrier sense multiple access with collision avoidance (CSMA-CA) operation. Therefore, the data collision can be prevented.
    • 提供了一种防止当两个或多个子节点同时向具有树路由方案并且以信标模式操作的ZigBee网络中的父节点发送数据时发生的数据冲突的方法。 在具有树路由方案并在信标模式下操作的ZigBee系统中,在父节点的信标帧中执行到父节点的数据通信。 这里,当在单个父节点下存在几个子节点时,子节点在接收到父节点的信标的时刻向父节点发送数据,使得当子节点同时发送数据时可能发生数据冲突 父节点的信标帧中的父节点。 在防止数据冲突的方法中,将两个或多个子节点中的每一个设置为在向父节点发送数据时等待其保护时间(延迟时间),以引起具有防冲突的正常时隙载波侦听多路访问(CSMA -CA)操作。 因此,可以防止数据冲突。
    • 94. 发明申请
    • Apparatus and Method for Computing Location of a Moving Beacon Using Time Difference of Arrival and Multi-Frequencies
    • 使用到达和多频率的时差计算移动信标位置的装置和方法
    • US20080291089A1
    • 2008-11-27
    • US12096777
    • 2006-12-08
    • Nak-Seon SeongChoon-Sik LimCheol-Sig PyoJong-Suk Chae
    • Nak-Seon SeongChoon-Sik LimCheol-Sig PyoJong-Suk Chae
    • G01S1/02
    • G01S5/06G01S5/14H04W64/00
    • Provided is an apparatus and method for computing the location of a radio beacon by using Time Difference Of Arrival (TDOA) and multiple frequencies. The apparatus and method of the present invention compute the location of a radio beacon without limitation in distance by using multiple frequencies and time difference of arrival to resolve the problem of phase ambiguity. A radio beacon location computing system includes a plurality of base stations configured to receive signals of multiple frequencies transmitted from the radio beacon, and detect and output phase differences and arrival time; and a location computing server configured to receive the phase differences and the arrival time outputted from the respective base stations, acquire calculation distances based on the phase differences, remove phase ambiguity from the calculation distances based on the arrival time, and compute the location of the radio beacon.
    • 提供了一种通过使用到达时差(TDOA)和多个频率来计算无线电信标的位置的装置和方法。 本发明的装置和方法通过使用多个频率和到达时间差来计算无线电信标的位置,而不限于距离,以解决相位模糊问题。 无线电信标位置计算系统包括多个基站,被配置为接收从无线电信标发送的多个频率的信号,并且检测和输出相位差和到达时间; 以及位置计算服务器,被配置为接收从各个基站输出的相位差和到达时间,基于相位差获取计算距离,基于到达时间从计算距离中消除相位模糊度,并且计算 无线电信标。
    • 95. 发明申请
    • Dual polarization antenna and RFID reader employing the same
    • 采用双极化天线和RFID阅读器
    • US20060145926A1
    • 2006-07-06
    • US11297182
    • 2005-12-07
    • Won-Kyu ChoiNak-Seon SeongCheol-Sig PyoJong-Suk Chae
    • Won-Kyu ChoiNak-Seon SeongCheol-Sig PyoJong-Suk Chae
    • H01Q1/38
    • H01Q1/2216H01Q1/22H01Q9/0421H01Q21/065H01Q21/24
    • Provided is a dual polarization antenna realized by using four inverted F-type radiators and a Radio Frequency Identification (RFID) reader employing the dual polarization antenna. The dual polarization antenna includes a ground plate and four inverted F-type radiators set up on the ground plate. Currents of the same phase are fed to the first and second inverted F-type radiators each other. Currents of an inverted phase are fed to the third and fourth inverted F-type radiators each other. The four inverted F-type radiators form an angle of 90° with one another. The first and second inverted F-type radiators radiate electric wave of vertical polarization and the third and fourth inverted F-type radiators radiate electric wave of horizontal polarization. Since the dual polarization antenna has excellent orthogonal and isolation characteristics, the antenna can extend a transmission distance between the reader and the tag and improve a communication quality.
    • 提供了通过使用四个反相F型辐射器实现的双极化天线和采用双极化天线的射频识别(RFID)读取器。 双极化天线包括接地板和设置在接地板上的四个倒F型散热器。 相同相位的电流彼此馈送到第一和第二倒置的F型散热器。 反相的电流相互馈送到第三和第四倒置的F型散热器。 四个倒F型散热器彼此形成90°的角度。 第一和第二倒F型辐射器辐射垂直极化电波,第三和第四反相F型辐射器辐射水平极化电波。 由于双极化天线具有优异的正交和隔离特性,所以天线可以扩展读取器和标签之间的传输距离,并提高通信质量。