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    • 4. 发明授权
    • Apparatus for measuring the frequency of microwave signals
    • 用于测量微波信号频率的装置
    • US4859934A
    • 1989-08-22
    • US108627
    • 1987-10-15
    • P. Michael GaleMyles McMillanAndre Gagnon
    • P. Michael GaleMyles McMillanAndre Gagnon
    • G01R23/02G01R23/12
    • G01R23/12G01R23/02
    • A microwave frequency detection receiver utilizing a prescaler comprised of one or a plurality of cascaded analog frequency dividers for down-converting received microwave signals to a predetermined compressed radio frequency bandwidth, connected to a combined frequency discriminator and quantizer processor. The frequency discriminator can be either a single or multiple delay line discriminator or a two-stage feed forward digital instantaneous frequency measurement device. The receiver is characterized by wide radio frequency input bandwidth as well as accurate frequency measurement capability on short single pulse signals. Delay line discriminators can operate with high data rates and in a dense signal environment with a high probability of accurate signal frequency detection and measurement, and are thus suitable for use in electronic warfare systems.
    • 一种微波频率检测接收机,其利用由一个或多个级联的模拟分频器组成的预分频器,用于将接收的微波信号下变频到预定的压缩射频带宽,连接到组合的鉴频器和量化器处理器。 鉴频器可以是单个或多个延迟线鉴频器或两级前馈数字瞬时频率测量装置。 接收机的特征在于宽的射频输入带宽以及短脉冲信号的精确的频率测量能力。 延迟线鉴别器可以以高数据速率和密集信号环境工作,具有准确的信号频率检测和测量概率,因此适用于电子战系统。
    • 6. 发明授权
    • Cable for use as a distributed antenna
    • 用作分布式天线的电缆
    • US5473336A
    • 1995-12-05
    • US158475
    • 1993-11-29
    • Robert K. HarmanAndre Gagnon
    • Robert K. HarmanAndre Gagnon
    • G08B13/24H01Q13/20
    • G08B13/2497H01Q13/203
    • A cable for use as a distributed antenna in intrusion detection systems comprises an internal open transmission line in parallel with a periodically loaded structure which supports an external transmission line mode of operation, specifically a surface wave, and is "driven" by the open transmission line. The periodically loaded structure may comprise transmission line segments for example cylindrical conductor elements intercoupled by serial inductive coupling. There are no fewer than three and no more than fifteen conductor elements in one wavelength (.lambda..sub.S) of the external transmission line modes. Preferably the length of each transmission line segment is about one quarter of the wavelength (.lambda..sub.S) of the external transmission line modes. The inductive coupling may be provided by resistance wires extending alongside the conductor elements. The open transmission line may comprise a two-wire line and the transmission line segments two arrays of conductor elements, associated with respective ones of the two wire. Alternatively, the open transmission line may be an open coaxial cable and the transmission line segments a series of cylinders surrounding the coaxial cable.
    • 用作入侵检测系统中的分布式天线的电缆包括与周期性加载的结构并联的内部开放传输线,其支持外部传输线操作模式,特别是表面波,并且由开放传输线“驱动” 。 周期性加载的结构可以包括传输线段,例如通过串联电感耦合相互耦合的圆柱形导体元件。 在外部传输线路模式的一个波长(λS)中,不少于三个,不超过十五个导体元件。 优选地,每个传输线段的长度约为外部传输线模式的波长(λS)的四分之一。 电感耦合可以由沿着导体元件延伸的电阻丝提供。 开放传输线可以包括双线线路,并且传输线分割与两条线中相应的导线元件相关联的两个导体元件阵列。 或者,开放式传输线可以是开放式同轴电缆,并且传输线分割围绕同轴电缆的一系列气缸。
    • 8. 发明授权
    • Apparatus for monitoring opening of sealed containers
    • 用于监测密封容器开口的装置
    • US5939982A
    • 1999-08-17
    • US92854
    • 1998-06-08
    • Andre GagnonChristian Tremblay
    • Andre GagnonChristian Tremblay
    • G08B13/06G08B13/14G08B21/18G08B1/08G01R27/28
    • G08B13/1427G08B13/06
    • Apparatus for monitoring opening of sealed enclosures, especially, but not exclusively, sealed containers containing goods-in-transit, such as goods vehicles, maritime containers or transport containers of the kind carried by tractor-trailers, ships, trains or aeroplanes comprises a radio receiver unit having at least one antenna for reception of radio signals. The receiver unit is housed within the enclosure and operates to scan a predetermined band of radio frequencies, periodically or continuously, and detect a sudden change in signal level. When it detects such a change in radio signal level, the receiver generates an alarm signal. Alternatively, the receiver may detect the difference between internal and external radio signal levels and determine the container to have been opened if the difference is less than a preset threshold. The receiver unit may be arranged to capture the FM frequency spectrum pertaining when the opening occurred and store it for later comparison with known FM frequency spectra of various cities to identify the location of the enclosure when opening occurred.
    • 用于监测密封外壳的打开的装置,特别是但不限于包含货物在内的密封容器,例如货车,海运集装箱或拖拉机,拖车,船舶,火车或飞机所携带的运输集装箱,包括无线电 接收器单元具有用于接收无线电信号的至少一个天线。 接收器单元被容纳在机壳内并且操作以周期性地或连续地扫描预定的射频频带,并且检测信号电平的突然变化。 当它检测到无线电信号电平的这种变化时,接收器产生报警信号。 或者,接收机可以检测内部和外部无线电信号电平之间的差异,并且如果差小于预设阈值,则确定容器已被打开。 接收器单元可以被布置成捕获在开始发生时属于的FM频谱,并且存储它以便稍后与各个城市的已知FM频谱进行比较,以便在开启发生时识别外壳的位置。
    • 9. 发明授权
    • Intrusion detection system
    • 入侵检测系统
    • US5510766A
    • 1996-04-23
    • US214007
    • 1994-03-16
    • Robert K. HarmanAndre Gagnon
    • Robert K. HarmanAndre Gagnon
    • G08B13/24G08B13/18
    • G08B13/2497
    • In an intrusion detection system comprising an open transmission line (10), for example a "leaky cable", and a receiver unit (12S,12T,14S,14T,16) for processing a radio frequency signal received by the line to detect perturbations caused by an intruder (28), problems of nonlinear sensitivity due to line attenuation are resolved by combining perturbation signals (R.sub.S, R.sub.T) from both ends of the open transmission line. A processor unit (18) computes logarithmic values of the perturbation signals from the opposite ends of the line and combines them to detect presence of an intruder. The sum of the logarithmic values may be used to determine presence of the intruder and the difference between them may be used to determine the location of the intruder relative to the end of the line. The processor may also use phase information from the two perturbation signals to facilitate detection in the presence of multipath effects. Reference signals (LO,IF.sub.T, RF) and power may be transmitted between receiver units (12S,14S, 12T,14T,16) by way of the open transmission line (10) itself. The system may employ several transmissions having different frequencies, in which case the processor (18) will sum perturbation signals for all transmission frequencies for each end of the line, combine the two sums, and compare the result with a predetermined threshold T.
    • 在包括开放传输线路(10)(例如“泄漏电缆”)的接入单元(12S,12T,14S,14T,16)中,用于处理由线路接收的射频信号以检测扰动 由入侵者(28)引起的线路衰减引起的非线性灵敏度问题通过组合开放传输线两端的扰动信号(RS,RT)来解决。 处理器单元(18)从线的相对端计算扰动信号的对数值,并将其组合以检测入侵者的存在。 可以使用对数值的总和来确定入侵者的存在,并且它们之间的差异可以用于确定入侵者相对于线路末端的位置。 处理器还可以使用来自两个扰动信号的相位信息来促进在存在多路径效应的情况下的检测。 参考信号(LO,IFT,RF)和功率可以通过开路传输线(10)本身在接收器单元(12S,14S,12T,14T,16)之间传输。 该系统可以采用具有不同频率的若干传输,在这种情况下,处理器(18)将针对线路的每一端的所有传输频率求和扰动信号,组合两个和,并将结果与​​预定阈值T进行比较。
    • 10. 发明授权
    • Method and apparatus for simultaneous instantaneous signal frequency
measurement
    • 用于同步瞬时信号频率测量的方法和装置
    • US4791360A
    • 1988-12-13
    • US37846
    • 1987-04-13
    • Andre GagnonMyles McMillanP. Michael Gale
    • Andre GagnonMyles McMillanP. Michael Gale
    • G01R23/00G01R23/165G01R23/175G01R33/20
    • G01R23/175G01R23/005G01R23/165
    • A method and apparatus for performing simultaneous instantaneous signal frequency measurement using a signal sorter in conjunction with a frequency measurement receiver. Simultaneous signals of similar amplitude are received and successively applied to a plurality of either frequency or time dependent signal modifying circuits, via switching circuitry. Respective ones of the received signals are separated with respect to frequency in one or both of amplitude and time from one another via the signal modifying circuits which can be, for instance low pass and high pass filters, or positive and negative dispersive delay lines. In addition, the received signals are applied to a straight-through signal path for transmitting the signals to the frequency measurement receiver unaltered. Signals output from the signal modifying circuits and the straight-through signal path are successively applied to the frequency measurement receiver for detecting the frequency of respective ones of the separated received signals.
    • 一种使用信号分类器与频率测量接收机一起执行同时瞬时信号频率测量的方法和装置。 经由开关电路接收并连续地将多个频率或时间相关的信号修正电路同时施加相同振幅的信号。 接收到的信号中的各个信号通过信号修正电路(例如低通滤波器,高通滤波器)或正和负色散延迟线路相互间的振幅和时间中的一个或两个中的频率分离。 此外,所接收的信号被施加到直通信号路径,用于将信号发送到频率测量接收机不变。 从信号修正电路和直通信号路径输出的信号被连续地施加到频率测量接收机,用于检测分离的接收信号中各个信号的频率。