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    • 5. 发明授权
    • Coherent processing tunnel diode ultra wideband receiver
    • 相干处理隧道二极管超宽带接收机
    • US5337054A
    • 1994-08-09
    • US885300
    • 1992-05-18
    • Gerald F. RossRichard M. Mara
    • Gerald F. RossRichard M. Mara
    • G01S7/34
    • G01S7/34
    • A four-terminal network in tandem with a tunnel diode (TD) threshold receiver currently used in radar or communications improves its sensitivity. Previous inventors have shown that the temperature and sensitivity properties of a conventional TD threshold device used for detecting very short duration bursts of microwave energy would be enhanced by appropriately biasing the TD by a current derived from the thermal noise; the current sets the TD operating point. The magnitude of the current is determined by a constant false alarm rate (CFAR) feedback loop. The subject invention recognizes that a TD changes states (i.e., a detection event) when the area under the current vs. time curve or the charge passing through the device exceeds a prescribed number of picocoulombs. To maximize the charge and improve detection, a form of superheterodyne conversion is introduced to convert the oscillatory short pulse microwave signal received by an antenna to a monopolar baseband signal. This is done by mixing the incoming signal with a CW carrier whose frequency is precisely chosen so that the resulting beat frequency is one-half of an rf cycle for the given duration of the microwave burst. This maximizes the charge available to trigger the TD. Proper gain and filtering is provided in the adjunct four-terminal network to establish minimum noise figure and appropriate gain to drive the TD held in a CFAR loop. It is shown both mathematically and experimentally that the subject invention can increase the receiver sensitivity by a factor of 20 dB or greater over the prior art. Proper microwave gain is provided to establish the noise figure prior to mixing in the added four-terminal network and a bandpass filter is employed to discard frequency components and the gain of a wideband IF (e.g., 0-500 MGz) is selected to appropriately drive the TD.
    • 与目前在雷达或通信中使用的隧道二极管(TD)阈值接收机一起的四终端网络提高了其灵敏度。 先前的发明人已经表明,用于检测微波能量非常短的持续时间脉冲串的常规TD阈值装置的温度和灵敏度特性将通过从热噪声导出的电流适当地偏置TD来增强; 当前设置TD工作点。 电流的大小由恒定的误报率(CFAR)反馈回路决定。 本发明认识到,当电流对时间曲线下的面积或通过装置的电荷超过规定数量的皮巧克仑时,TD改变状态(即检测事件)。 为了最大化电荷并改善检测,引入了一种超外差转换形式,以将由天线接收的振荡短脉冲微波信号转换成单极性基带信号。 这通过将输入信号与频率被精确地选择的CW载波混合来完成,使得所得到的拍频是给定的微波脉冲的持续时间的rf周期的一半。 这样可以最大限度地提高触发TD的电荷。 在附加四端网络中提供适当的增益和滤波,以建立最小噪声系数和适当的增益来驱动在CFAR环路中保持的TD。 在现有技术中,本发明可以以数学和实验的方式显示接收机灵敏度提高20dB或更大的系数。 提供适当的微波增益以在添加的四端网络中混合之前建立噪声系数,并采用带通滤波器来丢弃频率分量,并选择宽带IF(例如,0-500MGz)的增益以适当地驱动 TD。
    • 7. 发明授权
    • Synchronization of very short pulse microwave signals for array
applications
    • 用于阵列应用的非常短的脉冲微波信号的同步
    • US5084706A
    • 1992-01-28
    • US451430
    • 1989-12-15
    • Gerald F. RossRichard M. Mara
    • Gerald F. RossRichard M. Mara
    • H01Q3/26
    • H01Q3/26
    • A transmitter array includes a number of individual transmitters, each contributing a series of short microwave pulses each consisting of only several cycles to make up an RF pulse in the far field. Apparatus for closed loop synchronizing the pulses from each transmitter in order to maximize the amplitude of the RF pulse includes a Voltage Control Oscillator which provides a continuous wave (CW) reference to each transmitter and includes apparatus for dividing the CW down to feed a series of timers in each transmitter, each timer having a means for setting the time and duration of firing and providing an output signal synchronously related to the CW. A dual polarity peak detector fine tunes the individual transmitters via closed loop feedback to compensate for any thermal drift. A novel time delay vs. voltage transducer is used to achieve closed loop synchronization. Short term pulse jitter is significantly reduced by overtriggering the avalanche transistor. Beam steering is accomplished by simply adjusting a regulated DC voltage at each radiating source in the array. The end result is a low cost means for forming a time steered array of short pulse microwave sources.
    • 发射机阵列包括多个单独的发射机,每个发射机各自提供一系列短微波脉冲,每个微波脉冲仅由几个周期组成,以构成远场中的RF脉冲。 用于闭环同步来自每个发射器的脉冲以使RF脉冲的振幅最大化的装置包括电压控制振荡器,其向每个发射器提供连续波(CW)参考,并且包括用于将CW向下划分以供给一系列 每个发射机中的定时器,每个定时器具有用于设置点火的时间和持续时间的装置,并提供与CW同步相关的输出信号。 双极性峰值检测器通过闭环反馈精细调谐各个发射器,以补偿任何热漂移。 用新颖的延时与电压传感器来实现闭环同步。 通过过度触发雪崩晶体管,短期脉冲抖动显着降低。 光束转向通过简单地调整阵列中每个辐射源处的稳压直流电压来实现。 最终结果是用于形成短脉冲微波源的时间转向阵列的低成本手段。
    • 9. 发明授权
    • Geothermal well pump performance sensing system and monitor therefor
    • 地热井泵性能感测系统及其监测
    • US4107987A
    • 1978-08-22
    • US810220
    • 1977-06-27
    • Kenneth W. RobbinsGerald F. Ross
    • Kenneth W. RobbinsGerald F. Ross
    • E21B43/12F03G4/04F03G7/04G01R31/00E21B47/06
    • F03G7/04E21B43/127G01R31/00Y02E10/10
    • The operating characteristics of deep well pumping equipment in a geothermal well power-generation system are observed by cooperating sensor and communication elements permanently associated with the geothermal well equipment itself. Bridge circuit sensors detect well water temperature and water pressure below and above the pump, while a further sensor detects pump rotational speed. The data is transmitted by a multiplexing acoustic communication link coupled to receiver and display means located at the earth's surface. An electrical generator driven at the pump speed serves as the rotational speed pick off and additionally supplies multiplexing and signal processor power for use at the down-well site. The signal processor includes novel diode circuits in each bridge sensor channel for monitoring the operation of the individual sensors and their common power source, thereby providing a surface display of the parameter being measured by a particular sensor channel and additionally providing a calibrating display of the operating status of that channel.
    • 通过与地热井设备本身永久相关的协作传感器和通讯元件观察地热井发电系统深井抽水设备的运行特性。 桥式电路传感器检测泵的井下水温和水压,而另一传感器检测泵转速。 数据通过耦合到位于地球表面的接收机和显示装置的多路复用声通信链路传输。 以泵速驱动的发电机用作转速拾取,并且另外提供在下井位置使用的复用和信号处理器功率。 信号处理器在每个桥接传感器通道中包括新颖的二极管电路,用于监视各个传感器及其公共电源的操作,从而提供由特定传感器通道测量的参数的表面显示,并且另外提供操作的校准显示 该通道的状态。