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1. 发明授权

US4697184A Intrusion detection radar system with amplitude and frequency carrier modulation to eliminate targets at short and long ranges 失效
标题翻译：入侵检测雷达系统具有幅度和频率载波调制，可消除短距离和远距离目标
公开(公告)号：US4697184A
公开(公告)日：1987-09-29
申请号：US578539
申请日：1984-02-09
申请人： James Cheal , James R. Fitzsimmons , Edward J. Foley
发明人： James Cheal , James R. Fitzsimmons , Edward J. Foley
IPC分类号： G01S13/56 , G01S13/38 , G08B13/24
CPC分类号： G01S13/56
摘要： An outdoor microwave transceiver area intrusion detection system includes circuitry for both amplitude and frequency modulation of the microwave carrier signal pulses, which are transmitted at approximately a 50% duty cycle pulses, from a radar antenna to a target. The return signal is mixed with a portion of the transmitted signal to produce first and second doppler frequency signals which are amplified and sampled during a narrow gating pulse. The two resulting sampled doppler frequency signals are alternately switched, in synchronization with the amplitude and frequency modulation signals, into first and second sample/hold circuits to reconstruct the first and second doppler frequency signals. The reconstructed signals are coupled to a differential amplifier to obtain a "range signal" which is proportional to the phase difference between the first and second doppler signals. The range signal is amplified and used to set an alarm circuit if its amplitude exceeds a certain threshold level for a certain interval of time. Signals from "close in" targets, due to rain on the radome surface and the like, are eliminated by the low value of the range signal. Signals from distant targets are cut off by the narrow gating pulse.
摘要翻译：室外微波收发机区域入侵检测系统包括用于从雷达天线到目标以大约50％占空比脉冲传输的微波载波信号脉冲的幅度和频率调制的电路。返回信号与发射信号的一部分混合，以产生第一和第二多普勒频率信号，其在窄选通脉冲期间被放大和采样。将两个产生的采样多普勒频率信号与幅度和频率调制信号同步地交替地切换到第一和第二采样/保持电路中以重构第一和第二多普勒频率信号。重构的信号被耦合到差分放大器以获得与第一和第二多普勒信号之间的相位差成比例的“范围信号”。范围信号被放大并用于设置报警电路，如果其幅度在一定时间间隔超过某个阈值电平。 “靠近”目标的信号由于雷达罩表面上的雨等而被消除，因为距离信号的低值。来自远处目标的信号被狭窄的门控脉冲切断。

2. 发明授权

US4358764A Coupling unit for coaxial cable including means for radiating wave energy 失效
标题翻译：用于同轴电缆的耦合单元，包括用于辐射波能量的装置
公开(公告)号：US4358764A
公开(公告)日：1982-11-09
申请号：US173009
申请日：1980-07-28
申请人： James Cheal , Vincent J. McHenry
发明人： James Cheal , Vincent J. McHenry
IPC分类号： G01S7/03 , H01P5/12 , G01S13/56 , G08B13/24
CPC分类号： G01S7/03 , H01P5/12
摘要： An optimum coupling unit for joining adjacent sections of coaxial cable and a coupled radiating antenna includes different diameters of the dielectric material, different diameters of central conductor and different values of the dielectric constant material in order to provide impedance matching at any section of the coupler including the coupled antenna to the impedance of the coaxial cable. The coupling unit is combined with the antenna as an integral unit. The antenna may be a dipole whose elements are coupled to the coupling unit through a parallel plate transmission line. Impedance matches are maintained at each coupling point.
摘要翻译：包括用于连接同轴电缆的相邻部分和耦合的辐射天线的最佳耦合单元包括介电材料的不同直径，不同直径的中心导体和不同的介电常数材料的值，以便在耦合器的任何部分提供阻抗匹配，包括耦合天线到同轴电缆的阻抗。耦合单元与天线组合成一体的单元。天线可以是偶极子，其偶极通过平行板传输线耦合到耦合单元。阻抗匹配保持在每个耦合点。

3. 发明授权

US4328487A Intrusion detector system 失效
标题翻译：入侵检测系统
公开(公告)号：US4328487A
公开(公告)日：1982-05-04
申请号：US172944
申请日：1980-07-28
申请人： James Cheal
发明人： James Cheal
IPC分类号： G08B13/12 , G08B13/24
CPC分类号： G08B13/122 , G08B13/2497
摘要： An intrusion detection system includes a transmitter of wave energy at one end of a transmission line or coaxial cable, for example, and a receiver connected directly to the transmission line or a cable at the other end together with a series or discrete antennas uniformly spaced along the transmission line and relatively loosely coupled thereto. The coupling between the antennas and the transmission line or coaxial cable is determined to be of an optimum value and in such a system the sensitivity to an intrusion is the same along the length of the coaxial cable or transmission line for the same distance from the transmission line.
摘要翻译：入侵检测系统包括例如在传输线或同轴电缆的一端处的波能发射器，以及直接连接到传输线的接收器或另一端的电缆以及沿着均匀间隔的串联或离散天线传输线并且相对松动地耦合到其上。天线和传输线或同轴电缆之间的耦合被确定为最佳值，并且在这样的系统中，对于与传输相同距离的同轴电缆或传输线的长度，入侵的灵敏度是相同的线。

4. 发明授权

US4536752A Intrusion detection system and method 失效
标题翻译：入侵检测系统和方法
公开(公告)号：US4536752A
公开(公告)日：1985-08-20
申请号：US454444
申请日：1982-12-29
申请人： James Cheal , James R. Fitzsimons
发明人： James Cheal , James R. Fitzsimons
IPC分类号： G08B13/24 , G08B13/18
CPC分类号： G08B13/24
摘要： An intrusion detection system includes a transmitter coupled to one end of a coaxial cable, a plurality of antennas spaced along and loosely coupled to the cable, and a receiver circuit coupled to the opposite end of the cable, the antennas being aimed at a protected region. The transmitter transmits microwave energy along the cable. A portion of the energy is transmitted by each antenna into the protected region and is reflected by a moving intruder or target back to one of the antennas. The receiver circuit imposes a low frequency square wave signal on the center conductor of the cable. A diode is attached across the two radiating elements of each antenna. The square wave on the center conductor forward biases the diode and thereby shorts each antenna for half of each low frequency cycle, resulting in chopping of the received signals from each antenna. Noise signals on the cable and the chopped received energy signals are filtered and mixed to produce a low frequency chopped doppler signal superimposed on the noise low frequency chopped doppler signal. The signal is amplified to a predetermined level, and adjacent maximums and minimums thereof are synchronously sampled by a doppler amplifier to produce a signal representative of the amplitude of the doppler signal.
摘要翻译：入侵检测系统包括耦合到同轴电缆的一端的发射器，与电缆间隔开并松耦合的多个天线以及耦合到电缆的相对端的接收器电路，天线瞄准保护区域。发射机沿着电缆传输微波能量。能量的一部分由每个天线传输到受保护区域，并被移动的入侵者或目标物反射回其中一个天线。接收器电路在电缆的中心导体上施加低频方波信号。在每个天线的两个辐射元件之间安装一个二极管。中心导体上的方波向前偏置二极管，从而将每个天线短路到每个低频周期的一半，导致从每个天线斩波接收的信号。电缆上的噪声信号和斩波的接收能量信号被滤波和混合，以产生叠加在噪声低频斩波多普勒信号上的低频斩波多普勒信号。信号被放大到预定电平，并且其相邻的最大值和最小值由多普勒放大器同步采样，以产生表示多普勒信号幅度的信号。

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