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    • 4. 发明授权
    • Transmission signal direction finding apparatus and method
    • 传输信号测向装置及方法
    • US5099248A
    • 1992-03-24
    • US669839
    • 1991-03-15
    • Karl D. Brommer
    • Karl D. Brommer
    • G01S3/48
    • G01S3/48
    • An apparatus and method for determining the direction of origin of a received transmission signal using a spinning antenna pair generally provides the steps and apparatus for measuring the phase difference between signals simultaneously received, coarsely approximating the direction of origin of the transmission signal, reconstructing a phase difference signal using the measured phase differences and a calculated signal based upon the coarse approximation, correcting the reconstructed phase signal based upon the first derivatives of the reconstructed signal and the calculated signal, and determining the direction of origin based upon the corrected reconstructed phase signal.
    • 使用旋转天线对确定接收到的发送信号的原点方向的装置和方法通常提供了用于测量同时接收的信号之间的相位差的步骤和装置,粗略地近似于发送信号的原点方向,重建相位 使用所测量的相位差的差分信号和基于粗略近似的计算信号,基于重构信号和所计算的信号的一阶导数校正重建的相位信号,以及基于校正的重构相位信号确定原点方向。
    • 7. 发明授权
    • Optical velocimeter
    • US5000566A
    • 1991-03-19
    • US461348
    • 1990-01-05
    • John D. Kuppenheimer, Jr.Patrick E. Perkins
    • John D. Kuppenheimer, Jr.Patrick E. Perkins
    • G01P5/20G01P13/02
    • G01P5/20G01P13/02
    • This optical velocimeter may be installed in an aircraft to measure the true airspeed and the angles of attack and of sideslip of the aircraft. Alternatively, the velocimeter may be mounted in a wind tunnel to measure the velocity of the airstream passing through the wind tunnel. In either case, the points of reference for measurement are the large number of aerosol particles that are entrained in the air and are assumed to have the same velocity as the oxygen and nitrogen molecules of the air itself.The velocimeter comprises a plurality of optical transmitters and optical receivers. Each transmitter includes a laser operated in the continuous-wave mode and a laser operated in the pulsed mode. The laser operated in the continuous-wave mode generates a "precursor light sheet" at some distance from the aircraft whose velocity is to be measured or in the wind-tunnel airstream whose velocity is to be measured. When an aerosol particle intercepts the precursor light sheet, the laser operating in the pulsed mode, after a suitable time delay, generates a "first successor light sheet," which is in turn intercepted by the aerosol particle. The time of such interception is registered and initiates a delay period for passage of the aerosol particle to intercept "a second successor light sheet", also generated by the laser operated in the pulsed mode.The interception by the aerosol particle of the precursor light sheet and then in turn the two successor light sheets causes scintillations which propagate light back to the aforementioned receivers in the velocimeter. The receivers and their associated electronic circuitry record the time of passage of the aerosol particle between the two successor light sheets, as a first measure of the velocity of the aircraft with respect to the particles, or of the particles with respect to some fixed benchmark.By having a plurality of transmitters forming pairs of light sheets, such pairs being neither parallel nor orthogonal to one another, it is possible to resolve the components of motion of the respective aerosol particles and to recombine the resolved components to compute the vector components of the true velocity of the aircraft with respect to its own coordinate system. Certain other computations enable determination of the angle of attack and the angle of sideslip, if any, of the aircraft. Still further, this velocimeter calculates the Mach rate of the aircraft. These calculated outputs are then used as inputs to the control system for the aircraft, which may be inherently unstable and completely dependent upon such control inputs.
    • 8. 发明授权
    • Computed-interferometry radar system with coherent integration
    • 具有相干整合的计算干涉测量雷达系统
    • US4992796A
    • 1991-02-12
    • US482164
    • 1990-02-20
    • John T. Apostolos
    • John T. Apostolos
    • G01S7/40G01S13/02G01S13/48
    • G01S13/48G01S7/4004G01S2013/0227
    • In a radio-frequency radar system, a radar antenna (12) irradiates a region to be monitored, and antenna elements (14a-p) arrayed irregularly about a mobile platform (10) receive the resultant echo signal, which mixers (18 and 21) translate in frequency, coherently with the transmitted signal, to a lower frequency, at which a sample-and-hold circuit (24) can sample it. A beam-forming operation is performed on the sample signals by employing coefficients that have been computed from calibration readings taken by the elements mounted on the platform. The beam signals resulting from numerous successive transmitted pulses are then integrated coherently to produce an output.
    • 在射频雷达系统中,雷达天线(12)照射要监视的区域,并且围绕移动平台(10)不规则排列的天线元件(14a-p)接收所得到的回波信号,该混频器(18和21) )将频率与发射信号相干地转换到较低的频率,在该较低频率处采样和保持电路(24)可对其进行采样。 通过采用由安装在平台上的元件取得的校准读数计算出的系数,对采样信号进行波束形成操作。 然后,由许多连续发送的脉冲产生的波束信号被相干地整合以产生输出。