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公开(公告)号：US20100073237A1
公开(公告)日：2010-03-25
申请号：US12236598
申请日：2008-09-24
IPC分类号： H01Q1/38
摘要： In one embodiment, the present invention is a dual-polarized antenna array constructed from first and second instances of a planar antenna that are co-located and orthogonal to one another. The planar antenna comprises three conducting elements and a transmission line. The first conducting element comprises a straight segment and two arms of equal length. The proximal ends of the two arms are attached to opposite ends of the straight segment. The arms extend away from the second and third conducting elements and towards one another. The second and third conducting elements are separated by a gap and together form a mirror image of the first conducting element. The transmission line has first and second conductors that are coupled to the second and third conducting elements, respectively. In another embodiment, the present invention is a tri-polarized antenna array constructed from three orthogonal co-located instances of the planar antenna.
摘要翻译： 在一个实施例中，本发明是由彼此共同定位并且彼此正交的平面天线的第一和第二实例构成的双极化天线阵列。 平面天线包括三个导电元件和传输线。 第一导电元件包括直段和两臂等长。 两个臂的近端附接到直线段的相对端。 臂从第二和第三导电元件并且彼此朝向彼此延伸。 第二和第三导电元件被间隙隔开并一起形成第一导电元件的镜像。 传输线具有分别耦合到第二和第三导电元件的第一和第二导体。 在另一个实施例中，本发明是由平面天线的三个正交共位实例构成的三极化天线阵列。
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12.发明申请公开(公告)号：US20080056723A1
公开(公告)日：2008-03-06
申请号：US11199930
申请日：2005-08-09
IPC分类号： H04B10/00
CPC分类号： H04B10/118
摘要： An optical system may be configured as a receiving or as a transmitting system. As a receiving system, it is configured to receive at least one incident laser beam and project the beam into a spot on an array of actuable elements. The position of the spot is determined by the incident angular direction of the beam. The array is configured to track the position of the spot and at each tracked position of the spot to direct the beam onto an actual element. The actuable element tracks the spot so as to direct the beam onto a fixed path toward an optical receiver. As a transmitting system, it includes an actuable element configured to direct the light output from a laser into a spot on an array of actuable elements. The array is configured to track the position of the spot and at each tracked position of the spot to direct the light into a beam-forming system. The beam-forming system is configured to project the light in a transmitted beam having a variable angular direction. The beam angular direction is determined by the position of the spot on the array.
摘要翻译： 光学系统可以被配置为接收或发送系统。 作为接收系统，其被配置为接收至少一个入射激光束并将光束投射到可致动元件阵列上的点中。 光斑的位置由光束的入射角方向决定。 阵列被配置为跟踪点的位置和点的每个跟踪位置以将光束引导到实际元件上。 致动元件跟踪光点，以便将光束引导到朝向光接收器的固定路径上。 作为发射系统，它包括可致动元件，其被配置为将来自激光器的光输出引导到可致动元件阵列上的点中。 阵列被配置为跟踪点的位置和点的每个跟踪位置以将光引导到波束形成系统中。 波束形成系统被配置为将光投射在具有可变角度方向的透射光束中。 光束角方向由阵列上光斑的位置决定。
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公开(公告)号：US06868519B2
公开(公告)日：2005-03-15
申请号：US09839486
申请日：2001-04-23
IPC分类号： G06F11/10 , G06F12/02 , H03M13/15 , H03M13/27 , H04B10/10 , H04L1/00 , H03M13/00 , G06F11/00 , H03M13/03
CPC分类号： H04L1/0057 , H03M13/15 , H03M13/27 , H04B10/11 , H04L1/0071
摘要： A process and apparatus is described for recovering from optical transmission degradation due to scintillation effects in optical free space. A payload bit stream is encoded into Reed-Solomon codewords. These are fragmented and distributed as interleaved segments over a cell matrix of a SDRAM buffer store which is made large enough to correct a burst error occurring over 20 million consecutive bits. The rate imbalance between conventional read vs. write operations for SDRAM devices, which would otherwise obviate their use in this application by preventing real time operation, is overcome by an address remapping that avoids having to changing page addresses each time SDRAM memory is referenced. The remapping facilitates a more nearly equal allocation of READ overhead and WRITE overhead. An optical communications system employs at both the transmit and receive ends, substantially equivalent SDRAM buffer with address remapping capability.
摘要翻译： 描述了由于光学自由空间中的闪烁效应而从光传输劣化中恢复的过程和装置。 有效载荷比特流被编码为Reed-Solomon码字。 它们被分段并分布成SDRAM缓冲存储器的单元矩阵上的交错分段，其被制成足够大以校正在2000万连续位上发生的突发错误。 通过地址重映射来克服SDRAM器件的常规读/写操作之间的速率不平衡，通过地址重映射，每当SDRAM存储器被引用时，地址重映射避免了改变页地址，从而克服了在SDRAM应用中通过防止实时操作来消除它们的使用。 重新映射有助于读取开销和写入开销更接近于相等的分配。 光通信系统在发射和接收端都采用基本上等效的具有地址重映射能力的SDRAM缓冲器。
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14.发明授权公开(公告)号：US06236315B1
公开(公告)日：2001-05-22
申请号：US09421867
申请日：1999-10-19
IPC分类号： G08B1314
CPC分类号： G08B13/2488 , G06K7/0008 , G08B13/2417 , G08B13/2462 , G08B13/2471 , H01Q21/29
摘要： A method for increasing the interrogation range of an RF Tag in a radio communication system using RF Tags with two reflecting antenna elements. The second reflecting antenna element is predeterminately positioned, and preferably aligned, with respect to the first reflecting antenna element in the direction of expected incident RF radiation and is spaced from the first reflecting antenna element at a predetermined fixed distance. The first and second reflecting antenna elements are alternately pulsed on and off such that while the first reflecting antenna element is in a signal reflecting operating state, the second reflecting antenna element is in a substantially non-reflecting state and vice versa. The alternate pulsing and predetermined fixed spacing between the first and second elements generates a known phase difference between the reflected signals of the first and second reflecting antenna elements. The phase difference is preferably 180 degrees which may be achieved by spacing the second reflecting antenna element from the first reflecting antenna element at a distance equivalent to ¼ of the wavelength of the interrogating signals.
摘要翻译： 一种在具有两个反射天线元件的RF标签的无线电通信系统中增加RF标签的询问范围的方法。 第二反射天线元件相对于第一反射天线元件在预期的入射RF辐射的方向上被预先定位并且优选地对准，并且以预定的固定距离与第一反射天线元件间隔开。 第一反射天线元件和第二反射天线元件交替脉冲地通过和关闭，使得当第一反射天线元件处于反映操作状态的信号时，第二反射天线元件处于基本上非反射状态，反之亦然。 第一和第二元件之间的交替脉冲和预定的固定间隔产生第一和第二反射天线元件的反射信号之间已知的相位差。 相位差优选为180度，这可以通过将第二反射天线元件与第一反射天线元件间隔在等于询问信号的波长的1/4的距离来实现。
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公开(公告)号：US6046683A
公开(公告)日：2000-04-04
申请号：US777643
申请日：1996-12-31
IPC分类号： G01S13/524 , G01S3/48 , G01S5/04 , G01S13/536 , G01S13/74 , G01S13/87 , G01S13/90 , G06K7/00 , H04B1/40 , H04B1/59
CPC分类号： H04B1/40 , G01S13/878 , G01S5/04 , G06K7/0008 , G01S13/536 , G01S13/9035 , G01S3/48
摘要： A radio communications system is that can determine the location of an RFID Tag. The radio communication system includes at least one Interrogator for generating and transmitting a modulated radio signal to one or more Tags. The Interrogator is at a known location, and is in motion with respect to the Tag at a known velocity. One or more Tags of the system receive and demodulate the modulated radio signal, which contains a first information signal which specifies which Tag or Tags should respond using Modulated Backscattering. The Tag generates a subcarrier signal, and backscatter modulates the reflection of the radio signal using the subcarrier signal, thereby forming a reflected signal. The Interrogator receives and demodulates the reflected signal. The Interrogator then determines the Tag's relative direction from the location and velocity of the Interrogator, and from the Doppler shift of the subcarrier signal. More than one of such measurements allow the location of the Tag to be determined.
摘要翻译： 无线电通信系统可以确定RFID标签的位置。 无线电通信系统包括至少一个询问器，用于生成并向一个或多个标签发射调制的无线电信号。 询问器位于已知位置，并以已知速度相对于标签运动。 该系统的一个或多个标签接收和解调调制的无线电信号，该无线电信号包含第一信息信号，该第一信息信号指定哪个标签或标签应使用调制后向散射来响应。 标签产生副载波信号，后向散射利用副载波信号调制无线电信号的反射，从而形成反射信号。 询问器接收并解调反射信号。 然后，询问器根据询问器的位置和速度以及从子载波信号的多普勒频移确定标签的相对方向。 多个这样的测量允许确定标签的位置。
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