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1. 发明授权

US06677852B1 System and method for automatically controlling or configuring a device, such as an RFID reader 有权
标题翻译：用于自动控制或配置设备（如RFID读取器）的系统和方法
公开(公告)号：US06677852B1
公开(公告)日：2004-01-13
申请号：US09401066
申请日：1999-09-22
申请人： Jeremy A. Landt
发明人： Jeremy A. Landt
IPC分类号： H04Q522
CPC分类号： G06K7/0008 , G06K2207/1017
摘要： The system and method for automatically controlling or configuring, a device, such as an RFID Reader, reads a master control tag to upload sets of instructions from the tag to memory resident in the reader. Thereafter, the reader may read a control tag to select one or more sets of instructions stored in memory. The reader may thus be readily programmed without the need for physically connecting the reader to a computer, and without employing expensive key pads and display screens.
摘要翻译：用于自动控制或配置RFID读取器等设备的系统和方法读取主控制标签，以将标签上的指令集上传到读取器中的存储器。此后，读取器可以读取控制标签以选择存储在存储器中的一组或多组指令。因此，读取器可以容易地编程，而不需要将读取器物理连接到计算机，并且不需要使用昂贵的键盘和显示屏幕。

2. 发明授权

US5504485A System for preventing reading of undesired RF signals 失效
标题翻译：防止读取不需要的RF信号的系统
公开(公告)号：US5504485A
公开(公告)日：1996-04-02
申请号：US278276
申请日：1994-07-21
申请人： Jeremy A. Landt , Alfred R. Koelle , Donald F. Speirs
发明人： Jeremy A. Landt , Alfred R. Koelle , Donald F. Speirs
IPC分类号： G01S13/75 , G06K7/00 , G01S13/76
CPC分类号： G06K7/0008 , G01S13/758
摘要： The invention provides a reader-transponder system that prevents reading of undesired transponder signals. The reader generates a low-frequency signal that is used to supply power to the transponder. The same low-frequency signal also is used to generate a clock signal for the transponder. The reader varies the frequency of the low-frequency power signal according to a code that is unique to the reader. Because the transponder clock signal is derived from the encoded low-frequency power signal, it also varies in accordance with the reader's code. The coded transponder clock signal is contained in the modulation of the RF signal produced by the transponder. When the reader receives and decodes the RF signal, it also extracts the transponder clock signal from the received RF signal and compares variations in the extracted transponder clock signal to the code that was applied to the low-frequency power signal transmitted by the reader. If the pattern of variations in the transponder clock signal matches the reader's code, then the reader senses that the RF signal it has received is from a transponder being powered by that reader and no other.
摘要翻译：本发明提供了一种读取器 - 应答器系统，其防止不期望的应答器信号的读取。读卡器产生用于向应答器供电的低频信号。同样的低频信号也用于产生应答器的时钟信号。读取器根据阅读器唯一的代码改变低频功率信号的频率。因为应答器时钟信号是从编码的低频功率信号导出的，所以它也根据读取器的代码而变化。编码的应答器时钟信号包含在由应答器产生的RF信号的调制中。当读取器接收和解码RF信号时，它还从接收到的RF信号中提取应答器时钟信号，并将提取的应答器时钟信号中的变化与应用于读取器发送的低频功率信号的代码进行比较。如果应答器时钟信号的变化模式与读取器的代码相匹配，则读取器感测到其已经接收到的RF信号来自由该读取器供电的应答器，而不是其他的。

3. 发明申请

US20110187600A1 SYSTEM AND METHOD FOR MEASUREMENT OF DISTANCE TO A TAG BY A MODULATED BACKSCATTER RFID READER 有权
标题翻译：用于通过调制背板RFID读取器测量距离到标签的系统和方法
公开(公告)号：US20110187600A1
公开(公告)日：2011-08-04
申请号：US12840587
申请日：2010-07-21
申请人： Jeremy A. Landt
发明人： Jeremy A. Landt
IPC分类号： G01S3/02
CPC分类号： G01S3/02
摘要： Distance to a modulated backscatter tag is measured with a RFID reader that measures changes in phase with frequency of modulated backscattered RF signals. Measured distances are linked to a specific tag. The effects of other sources of reflected and interfering signals are mitigated. The techniques eliminate the need for high RF bandwidth used in time-of-flight methods, and may be used with linear, limiting or other types of amplifiers in the reader receiver. Unambiguous distance to a tag may be found using the derivative of phase with RF frequency of the modulated signal backscattered by a tag. The distance to a tag can be measured with an accuracy on the order of a centimeter. The techniques utilize the characteristics of cooperative backscatter tags (transponders, labels, etc.). New readers implement the techniques which may use unmodified tags.
摘要翻译：使用RFID读取器测量到调制反向散射标签的距离，RFID读取器测量调制后向散射RF信号的频率的相位变化。测量距离与特定标签相关联。反映和干扰信号的其他来源的影响得到缓解。该技术消除了在飞行时间方法中使用的高RF带宽的需要，并且可以与读取器接收器中的线性，限制或其他类型的放大器一起使用。可以使用由标签反向散射的调制信号的RF频率的相位导数来找到与标签的明确距离。与标签的距离可以以一厘米的数量级的精度进行测量。该技术利用了协作反向散射标签（转发器，标签等）的特性。新读者实现可能使用未修改标签的技术。

4. 发明授权

US4999636A Range limiting system 失效
标题翻译：范围限制系统
公开(公告)号：US4999636A
公开(公告)日：1991-03-12
申请号：US312617
申请日：1989-02-17
申请人： Jeremy A. Landt , Alfred R. Koelle , David A. Eckhardt
发明人： Jeremy A. Landt , Alfred R. Koelle , David A. Eckhardt
IPC分类号： G01S13/74 , G01S7/292 , G01S13/82
CPC分类号： G01S13/82
摘要： Briefly, the range limiting system of the invention is capable of differentiating desired received signals having an amplitude above a predetermined threshold level and at least one other recognizable predetermined characteristic, from other received signals below that predetermined threshold amplitude. The system has a means for combining the received signal, which is of unknown amplitude which may be above or below the predetermined threshold amplitude, with a known signal of the predetermined threshold amplitude having at least one other predetermined characteristic which is distinguishable from the other recognizable characteristic of the received signal. The output of the combining means passes to a signal processing means which produces an output signal whose other recognizable characteristic is determined by the received signal only when the received signal is above the predetermined threshold amplitude, and by the known signal when the received signal is below the predetermined threshold amplitude. The presence or absence of the desired signal is determined on the basis of analysis of the other predetermined characteristic of the output signal of the signal processing means.

5. 发明授权

US5030807A System for reading and writing data from and into remote tags 失效
标题翻译：用于从远程标签读取和写入数据的系统
公开(公告)号：US5030807A
公开(公告)日：1991-07-09
申请号：US465428
申请日：1990-01-16
申请人： Jeremy A. Landt , Alfred R. Koelle
发明人： Jeremy A. Landt , Alfred R. Koelle
IPC分类号： G01S13/74 , B61L25/04 , G05B13/02 , G05B23/02 , G06K7/00 , G06K17/00 , G07B15/06 , G08C17/00 , G08G1/017 , G08G1/09
CPC分类号： G07B15/063 , B61L25/048 , G06K7/0008 , G08G1/017
摘要： The subject invention relates to a system for identifying, for writing data into and reading data out of electronic tags which may be attached to moving and moveable objects. An interrogator sends an RF signal to a remote tag, the signal including data intended to be received and stored in the tag. The tag backscatter-modulates the received signal with data temporarily and permanently stored in the tag, including data indicating the identity of the object to which the tag is attached. The interrogator has the capability of (1) recognizing the identity of the tagged object from the returned backscatter-modulated signal and (2) transmitting data to the tag only if it has data to be transmitted to that particular tagged object. This permits data to be selectively transmitted to a tag and received and stored by that tag only after the tag has been identified as a correct one to receive that data. The tag, in addition, may have the capability of increasing its sensitivity to the receipt of transmitted data after receiving a signal from the interrogator of sufficient strength to be capable of transmitting data to that tag.

6. 发明授权

US4888591A Signal discrimination system 失效
标题翻译：信号辨别系统
公开(公告)号：US4888591A
公开(公告)日：1989-12-19
申请号：US254254
申请日：1988-10-06
申请人： Jeremy A. Landt , Alfred R. Koelle , David A. Eckhardt
发明人： Jeremy A. Landt , Alfred R. Koelle , David A. Eckhardt
IPC分类号： G01S7/292 , G01S13/26 , G01S13/82 , G01S13/91
CPC分类号： G01S13/82
摘要： The invention provides a system for discriminating between modulated backscattered signals based upon transmission-to-reception time delay. The system employs a carrier, phase-modulated with a modulating signal, having characteristics which provide unity output when correlated with itself with zero time shift and a substantially lower output level when correlated with itself with a significant time shift. The system works with a backscatter-modulator located a finite distance from the transmitter for receiving and modulating the backscatter of the carrier. A receiver/detector receives and detects the modulated backscattered phase-modulated signal, the detector being phase-sensitive and having as a reference signal the transmitted phase-modulating carrier signal, and having as an input signal the phase modulated backscattered carrier. The detector provides an output signal whose averaged amplitude is substantially dependent upon the degree of phase correlation between the phase of the modulation returned input signal and the reference signal. Finally, the output signal from the detector is selectively processed only when its averaged amplitude is above a threshold level. In a preferred embodiment, the transmitted signal is a spread spectrum signal.

7. 发明授权

US4782345A Transponder antenna 失效
标题翻译：发射机天线
公开(公告)号：US4782345A
公开(公告)日：1988-11-01
申请号：US891226
申请日：1986-07-29
申请人： Jeremy A. Landt
发明人： Jeremy A. Landt
IPC分类号： G01S13/75 , G01S7/02 , G01S7/03 , G01S13/76 , G01S13/79 , H01Q5/00 , H01Q5/357 , H01Q9/06 , H01Q13/10 , H04B1/59 , H01Q1/40
CPC分类号： H01Q13/106 , H01Q5/357 , H01Q9/065
摘要： A dielectric member may be thin and planar and may have first and second opposite surfaces. An electrically conductive material is disposed on the first surface at one end of the first surface and an electrically conductive material is disposed on the second surface at the opposite end of the second surface. The conductive materials in the first and second surfaces define a first antenna operative at a first frequency. Slots are provided in the conductive material in the first surface. The slots define a second antenna operative at a second frequency greater than the first frequency. The slots include first and second slots extending in a direction transverse to the relative direction of the conductive materials on the first and second surfaces. The first and second slots may have substantially equal lengths and may be aligned with each other. The slots also include third and fourth slots extending in such relative direction and respectively communicating with the first and second slots. The third and fourth slots are in spaced and parallel relationship to define a conductive portion. The lengths of the first and second slots define the frequency of the signals from the second antenna and the lengths of the third and fourth slots define the impedance of the second antenna. Additional conductive material is disposed on the first surface of the dielectric member in electrical communication with the conductive portion. The additional conductive material is disposed opposite the conductive material on the second surface and is provided with a length defining the impedance of the first antenna.
摘要翻译：电介质构件可以是薄且平坦的并且可以具有第一和第二相对表面。导电材料设置在第一表面的一端的第一表面上，导电材料设置在第二表面的相对端的第二表面上。第一和第二表面中的导电材料限定以第一频率工作的第一天线。插槽设置在第一表面的导电材料中。这些槽定义了在大于第一频率的第二频率下工作的第二天线。槽包括在横向于第一和第二表面上的导电材料的相对方向的方向上延伸的第一和第二槽。第一和第二槽可以具有基本相等的长度并且可以彼此对准。狭槽还包括在这样的相对方向上延伸并分别与第一和第二狭槽连通的第三和第四狭槽。第三和第四槽是间隔和平行的关系，以限定导电部分。第一和第二槽的长度限定来自第二天线的信号的频率，并且第三和第四槽的长度限定第二天线的阻抗。另外的导电材料设置在电介质构件的与导电部分电连通的第一表面上。另外的导电材料与第二表面上的导电材料相对设置，并且具有限定第一天线的阻抗的长度。

8. 发明授权

US4739328A System for identifying particular objects 失效
标题翻译：用于识别特定对象的系统
公开(公告)号：US4739328A
公开(公告)日：1988-04-19
申请号：US885248
申请日：1986-07-14
申请人： Alfred R. Koelle , Jeremy A. Landt
发明人： Alfred R. Koelle , Jeremy A. Landt
IPC分类号： G01S13/74 , B61L25/04 , G01S13/75 , G01S13/76 , G06K7/00 , G06Q10/08 , G07C9/00 , H04L27/26
CPC分类号： H04L27/26 , B61L25/04 , B61L25/045 , G01S13/758 , G06K7/0008 , G06Q10/087 , G07C9/00111 , G07C2009/0092
摘要： A reader interrogates an object. The object has a tag with a data source such as a read-only memory (ROM) which produces an identifying sequence of binary 1's and 0's in an individual pattern and transmits these signals to the reader. Each "1" or "0" is converted to a plurality of signal cycles at first and second harmonic frequencies. For example, a "1" may be identified by two signal cycles at the second frequency (e.g. 40 kHz) and then one signal cycle at the first frequency (e.g. 20 kHz) and a "0" may be identified by a signal cycle at the first frequency and then two signal cycles at the second frequency. The transponder also produces a plurality of signal cycles in an individual code (different from any combination of "1's" and "0's") to indicate the end of the transmission of the signal cycles identifying the object and the start of another transmission. The reader receives the signal cycles identifying the object and delays these signal cycles by (a) a first time such as 1/4 period of a cycle at the second frequency, (b) a second time such as 1/2 of such period and (c) a third time corresponding to such period. The reader compares the received signals and the first delayed signals to produce first phase-locked signals. The reader compares the received signals and the second delayed signals to produce additional phase-locked signals at the times that the first phase-locked signals are not produced. The reader then produces clock signals from the first and additional phase-locked signals. The reader produces information signals from a comparison of the received signals and the third delayed signals. The reader synchronizes the information signals with the lock signals to identify the object.

9. 发明授权

US08188908B2 System and method for measurement of distance to a tag by a modulated backscatter RFID reader 有权
标题翻译：用于通过调制的反向散射RFID读取器测量与标签的距离的系统和方法
公开(公告)号：US08188908B2
公开(公告)日：2012-05-29
申请号：US12840587
申请日：2010-07-21
申请人： Jeremy A. Landt
发明人： Jeremy A. Landt
IPC分类号： G01S13/08
CPC分类号： G01S3/02
摘要： Distance to a modulated backscatter tag is measured with a RFID reader that measures changes in phase with frequency of modulated backscattered RF signals. Measured distances are linked to a specific tag. The effects of other sources of reflected and interfering signals are mitigated. The techniques eliminate the need for high RF bandwidth used in time-of-flight methods, and may be used with linear, limiting or other types of amplifiers in the reader receiver. Unambiguous distance to a tag may be found using the derivative of phase with RF frequency of the modulated signal backscattered by a tag. The distance to a tag can be measured with an accuracy on the order of a centimeter. The techniques utilize the characteristics of cooperative backscatter tags (transponders, labels, etc.). New readers implement the techniques which may use unmodified tags.
摘要翻译：使用RFID读取器测量到调制反向散射标签的距离，RFID读取器测量调制后向散射RF信号的频率的相位变化。测量距离与特定标签相关联。反映和干扰信号的其他来源的影响得到缓解。该技术消除了在飞行时间方法中使用的高RF带宽的需要，并且可以与读取器接收器中的线性，限制或其他类型的放大器一起使用。可以使用由标签反向散射的调制信号的RF频率的相位导数来找到与标签的明确距离。与标签的距离可以以一厘米的数量级的精度进行测量。该技术利用了协作反向散射标签（转发器，标签等）的特性。新读者实现可能使用未修改标签的技术。

10. 发明授权

US06600443B2 Method and apparatus to determine the direction to a transponder in a modulated backscatter communication system 有权
公开(公告)号：US06600443B2
公开(公告)日：2003-07-29
申请号：US10273159
申请日：2002-10-18
申请人： Jeremy A. Landt
发明人： Jeremy A. Landt
IPC分类号： G01S1382
CPC分类号： G01S3/48 , G01S3/043 , G01S3/38 , G06K19/0723
摘要： Methods and systems for determining the direction to a transponder are disclosed. The methods and systems include transmitting a first signal to an area where communications with a transponder is desired; producing a second signal desired from the first signal; receiving the second signal via a first and second antenna forming a difference signal from the second signal received via the first and second antennas; forming a third signal by adding the second signal received via the first antenna and the second signal received via the third antenna; delaying the difference signal; and comparing a fist polarity of the delayed difference signal with a second polarity of the third signal.

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