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22 条记录 (耗时 0.046 秒)

    Dual mode active aperture
    3.
    发明授权
    Dual mode active aperture 失效
    双模有效光圈

    公开(公告)号：US5155492A

    公开(公告)日：1992-10-13

    申请号：US706664

    申请日：1991-05-29

    申请人： Francis W. Hopwood ,  Jerry A. Kane ,  Thomas R. Turlington ,  David S. Oros

    发明人： Francis W. Hopwood ,  Jerry A. Kane ,  Thomas R. Turlington ,  David S. Oros

    IPC分类号： G01S7/03 ,  H01Q3/28 ,  H01Q23/00

    CPC分类号： H01Q3/28 ,  G01S7/03 ,  H01Q23/00

    摘要： A dual mode active aperture phased array system for pulsed radar and continuous wave applications. The system may be switched between the two modes without appreciable loss of average effective radiated power. Both the voltage and current of the biasing power to the amplifying transistors is varied to accommodate the difference in peak amplitude power while maintaining the optimum average effective radiated power. The DC power supply is a chopper.

    摘要翻译： 一种用于脉冲雷达和连续波应用的双模有源孔径相控阵。 系统可以在两种模式之间切换，而没有平均有效辐射功率的明显损失。 改变放大晶体管的偏置功率的电压和电流是变化的，以适应峰值功率的差异，同时保持最佳平均有效辐射功率。 直流电源是斩波器。

    Digitally controlled phase lock distillator system
    5.
    发明授权
    Digitally controlled phase lock distillator system 失效
    数字控制相锁系统

    公开(公告)号：US4318055A

    公开(公告)日：1982-03-02

    申请号：US70232

    申请日：1979-08-27

    申请人： Francis W. Hopwood ,  John P. Muhlbaier ,  Jeffrey T. Oakes ,  James T. Haynes

    发明人： Francis W. Hopwood ,  John P. Muhlbaier ,  Jeffrey T. Oakes ,  James T. Haynes

    IPC分类号： H03L7/08 ,  H03L7/16

    CPC分类号： H03L7/16 ,  H03L7/08

    摘要： A system for comparing the frequency of a voltage controlled oscillator to a stable reference oscillator to generate control signals which maintain the voltage controlled oscillator in phase lock with the reference oscillator. The circuit utilizes a digital frequency comparator to determine whether the output frequency of the voltage controlled oscillator is above or below the reference frequency. When the frequency of the oscillator is either above or below the desired value, pulses are generated which are integrated to produce a DC signal which changes the frequency of the oscillator to achieve the desired value. Additionally, a continuous electrical signal is generated when the output of the voltage controlled oscillator is in phase with the reference signal. When phase lock is achieved the output of the frequency determining circuit goes to zero and phase lock is maintained by the continuous electrical signal.

    摘要翻译： 用于将压控振荡器的频率与稳定的参考振荡器进行比较以产生控制信号的系统，该控制信号使压控振荡器与参考振荡器锁相。 电路利用数字频率比较器来确定压控振荡器的输出频率是否高于或低于参考频率。 当振荡器的频率高于或低于期望值时，产生脉冲，其被积分以产生改变振荡器频率以获得期望值的DC信号。 此外，当压控振荡器的输出与参考信号同相时，产生连续的电信号。 当实现锁相时，频率确定电路的输出变为零，并通过连续的电信号保持相位锁定。

    Optical radar with range and doppler measurement capability
    6.
    发明授权
    Optical radar with range and doppler measurement capability 有权
    具有范围和多普勒测量能力的光学雷达

    公开(公告)号：US06697148B1

    公开(公告)日：2004-02-24

    申请号：US10075365

    申请日：2002-02-15

    申请人： Francis W. Hopwood ,  John H. Glezen

    发明人： Francis W. Hopwood ,  John H. Glezen

    IPC分类号： G01C308

    CPC分类号： G01S17/58 ,  G01S7/484 ,  G01S17/10

    摘要： A laser radar system is disclosed. The laser radar system includes a transmitting means that transmits a signal. The transmitted signal is formed by an optical signal that is amplitude modulated with a source signal thereby forming a transmitted signal having light packets at a repetition rate of the source signal. A receiving means that receives the transmitted signal after it is reflected from an object. A Doppler processor determines the Doppler frequency shift of the source signal from signals derived from the reflected signal.

    摘要翻译： 公开了一种激光雷达系统。 激光雷达系统包括发送信号的发送装置。 发送信号由用信号源进行幅度调制的光信号形成，从而以源信号的重复率形成具有光分组的发送信号。 一种在从物体反射之后接收发送信号的接收装置。 多普勒处理器根据来自反射信号的信号确定源信号的多普勒频移。

    Phased array antenna architecture and related method
    7.
    发明授权
    Phased array antenna architecture and related method 失效
    相控阵天线架构及相关方法

    公开(公告)号：US5079557A

    公开(公告)日：1992-01-07

    申请号：US632784

    申请日：1990-12-24

    申请人： Francis W. Hopwood ,  Peggy J. Sowell

    发明人： Francis W. Hopwood ,  Peggy J. Sowell

    IPC分类号： H01Q3/26 ,  H01Q21/00

    CPC分类号： H01Q3/26 ,  H01Q21/0025

    摘要： A phased array antenna having a first plurality of phase shifters each connected to a solid state transmit module power amplifier. Equal split power combiners, each having a pair of inputs and a pair of outputs, are connected to the power amplifiers and to each other in a corporated tree hierarchal configuration. One of the pair of inputs of each of the power combiners of each higher hierarchy is connected to one of the pair of outputs of the power combiners of a lower hierarchy. A subarray is connected to the other of the pair of outputs of each of the power combiners. A subarray is connected to both outputs of the highest hierarchy. A second plurality of individual phase shifter elements are associated with the individual elements of each subarray. The first plurality of phase shifter elements adjust the illumination and phase of the signal entering each subarray. The second plurality of phase shift elements steer the beam. The array architecture enables varying the aperture taper without incurring significant power loss; and the internal tapering of each subarray to control quantization effects.

    摘要翻译： 一种相控阵天线，具有各自连接到固态发射模块功率放大器的第一多个移相器。 每个具有一对输入和一对输出的等分功率组合器以公共树分级配置连接到功率放大器和彼此。 每个较高层级的每个功率组合器的一对输入中的一个连接到下层功率组合器的一对输出端。 子阵列连接到每个功率组合器的一对输出中的另一个。 子阵列连接到最高层次的两个输出。 第二多个单独的移相器元件与每个子阵列的各个元件相关联。 第一组多个移相器元件调节进入每个子阵列的信号的照明和相位。 第二组多个相移元件转向光束。 阵列结构使得能够改变孔径锥度而不会导致显着的功率损耗; 并且每个子阵列的内部逐渐变细以控制量化效应。

    Multi-mode radar exciter
    8.
    发明授权
    Multi-mode radar exciter 失效
    多模雷达激励器

    公开(公告)号：US6081226A

    公开(公告)日：2000-06-27

    申请号：US113210

    申请日：1998-07-10

    申请人： Stephen P. Caldwell ,  Francis W. Hopwood ,  Thomas K. Lisle, Jr. ,  Wayne Weigle

    发明人： Stephen P. Caldwell ,  Francis W. Hopwood ,  Thomas K. Lisle, Jr. ,  Wayne Weigle

    IPC分类号： G01S7/282 ,  G01S7/288 ,  G01S13/02 ,  G01S13/10

    CPC分类号： G01S13/106 ,  G01S7/282 ,  G01S7/288 ,  G01S2013/0272

    摘要： A radar exciter including a direct digital synthesis (DDS) wideband waveform generator which performs the frequency synthesis function heretofore performed by a direct analog synthesizer. This is achieved by deriving the DDS frequencies, the exciter RF frequencies, the radar synchronizer clock frequency and receiver analog/digital (A/D) converter clock frequency from a common signal source generating a master frequency. The present invention eliminates the direct analog synthesizer and relies solely on the digital generation of waveforms by a DDS wideband waveform generator which performs a discrete sampling process so as to provide coherent frequency and timing relationships.

    摘要翻译： 包括直接数字合成（DDS）宽带波形发生器的雷达激励器，其执行由直接模拟合成器执行的频率合成功能。 这是通过从产生主频率的公共信号源导出DDS频率，激励器RF频率，雷达同步器时钟频率和接收器模拟/数字（A / D）转换器时钟频率来实现的。 本发明消除了直接模拟合成器，并且仅依赖于执行离散采样处理以提供相干频率和时序关系的DDS宽带波形发生器的数字生成波形。

    Coordinate system transformation apparatus for a high resolution radar
    9.
    发明授权
    Coordinate system transformation apparatus for a high resolution radar 失效
    用于高分辨率雷达的坐标系变换装置

    公开(公告)号：US4847624A

    公开(公告)日：1989-07-11

    申请号：US139512

    申请日：1987-12-30

    申请人： Francis W. Hopwood ,  Jerry A. Kane ,  George A. Ioannidis ,  Martin J. Decker

    发明人： Francis W. Hopwood ,  Jerry A. Kane ,  George A. Ioannidis ,  Martin J. Decker

    IPC分类号： G01S13/28 ,  G01S13/90

    CPC分类号： G01S13/90 ,  G01S13/282

    摘要： The present invention includes an apparatus that prebiases a transmitted radar signal. The prebiasing of the transmit signal automatically aligns the return signals in one dimension or dimensionally transforms the return signals thereby removing the need for one of the dimensional processing operations of a conventinal two dimensional return signal interpolator. A map function generator produces small frequency (phase) changes in the transmitted signal during each pulse over the entire integration or exposure period. The map function generator produces a parabolic frequency change control signal applied during the integration period. The control signal is divided into segments where each segment controls a single transmit pulse. The control signal modifies a linear frequency modulation control signal. conventionally produced by high resolution radar systems.

    摘要翻译： 本发明包括一种预发射雷达信号的装置。 发射信号的预偏置自动地将返回信号对准一维，或者对返回信号进行尺寸变换，从而消除对传统二维返回信号内插器的维度处理操作之一的需要。 地图函数发生器在整个整合或曝光期间的每个脉冲期间产生发射信号的小频率（相位）变化。 地图函数发生器产生在积分期间施加的抛物线频率变化控制信号。 控制信号被分成段，每个段控制单个发射脉冲。 控制信号修改线性调频控制信号。 通常由高分辨率雷达系统生产。

    Phase lock loop for a voltage controlled oscillator
    10.
    发明授权
    Phase lock loop for a voltage controlled oscillator 失效
    压控振荡器的锁相环

    公开(公告)号：US4009448A

    公开(公告)日：1977-02-22

    申请号：US646800

    申请日：1976-01-06

    申请人： Francis W. Hopwood ,  Lester K. Staley

    发明人： Francis W. Hopwood ,  Lester K. Staley

    IPC分类号： H03L7/12 ,  H03B3/04

    CPC分类号： H03L7/12 ,  H03L2207/14

    摘要： A phase lock loop configuration having a voltage controlled oscillator utilized, for example, in radar systems wherein false locking is prevented and loop bandwidth is maintained substantially constant. The voltage controlled oscillator includes a cavity resonator within which is located two tuning varactor diodes, one of which is heavily coupled to the resonator and comprises a coarse tuning port and one of which is lightly coupled and comprises the fine tuning port. The configuration is such that when the loop is locked, following a sweep mode of the coarse tuning voltage, the fine tune voltage is held constant at a predetermined DC level thereby making the fine tuning sensitivity essentially constant as the coarse tuning voltage changes the frequency over the band of interest.

    摘要翻译： 一种具有压控振荡器的锁相环配置，例如在雷达系统中被利用，其中防止假锁定并且保持环路带宽基本恒定。 压控振荡器包括空腔谐振器，在谐振腔内设置有两个调谐变容二极管，其中一个与谐振器重耦合，并包括一个粗调谐端口，其中一个微调耦合并包括微调端口。 该配置使得当环路被锁定时，在粗调谐电压的扫描模式之后，微调电压保持恒定在预定的DC电平，从而使得微调电压基本上恒定，因为粗调谐电压改变频率 感兴趣的乐队。