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    Methods and apparatus for randomly modulating radar altimeters
    2.
    发明授权
    Methods and apparatus for randomly modulating radar altimeters 失效
    随机调制雷达高度计的方法和装置

    公开(公告)号：US07064703B2

    公开(公告)日：2006-06-20

    申请号：US10780411

    申请日：2004-02-17

    申请人： Lavell Jordan ,  James R. Hager

    发明人： Lavell Jordan ,  James R. Hager

    IPC分类号： G01S13/08

    CPC分类号： G01S13/288 ,  G01S7/288 ,  G01S13/882

    摘要： A method for randomly phase modulating a radar altimeter is described. The method includes momentarily applying a signal from a random noise source to an amplifier, applying an output of the amplifier to a voltage controlled oscillator (VCO), applying an output of the VCO to a transmitter and mixer of the radar altimeter to modulate transmissions of the radar altimeter and to demodulate reflected radar transmissions received by the radar altimeter and holding the output of the amplifier constant from before a radar altimeter transmission until after reception of the reflected radar signals from that transmission by the radar altimeter. The method further includes repeating the applying steps and the holding step.

    摘要翻译： 描述了雷达高度计的随机相位调制方法。 该方法包括将随机噪声源的信号瞬时施加到放大器，将放大器的输出施加到压控振荡器（VCO），将VCO的输出施加到雷达高度计的发射机和混频器，以调制 并且对由雷达高度计接收到的反射雷达传输进行解调，并将雷达高度计传输之前的放大器的输出保持恒定，直到雷达高度计从该传输接收到反射的雷达信号为止。 该方法还包括重复施加步骤和保持步骤。

    Methods and apparatus for conversion of radar return data
    3.
    发明授权
    Methods and apparatus for conversion of radar return data 有权
    用于转换雷达回波数据的方法和装置

    公开(公告)号：US06734820B2

    公开(公告)日：2004-05-11

    申请号：US10144744

    申请日：2002-05-13

    申请人： James R. Hager ,  Jens M. Henrickson ,  Lavell Jordan ,  Curtis J. Petrich

    发明人： James R. Hager ,  Jens M. Henrickson ,  Lavell Jordan ,  Curtis J. Petrich

    IPC分类号： G01S1353

    CPC分类号： G01S13/524 ,  G01S3/48 ,  G01S7/292 ,  G01S13/18 ,  G01S13/20 ,  G01S13/288 ,  G01S13/42 ,  G01S13/70 ,  G01S13/882 ,  G01S13/94

    摘要： An in-phase/quadrature component (IQ) mixer is configured to reject returns from a negative doppler shift swath in order to mitigate corruption of returns of a positive doppler shift swath. The mixer includes a sample delay element which produces a quadrature component from the in-phase component of an input signal. Further included are a plurality of mixer elements, a plurality of low pass filters, a plurality of decimators, and a plurality of all pass filters which act upon both the in-phase and quadrature components of the input signal. Also, a subtraction element is included which is configured to subtract the filtered and down sampled quadrature component from the filtered and down sampled in-phase component.

    摘要翻译： 配置同相/正交分量（IQ）混频器以拒绝来自负多普勒频移帧的返回，以便减轻正多普勒频移帧的返回的损坏。 混频器包括采样延迟元件，其从输入信号的同相分量产生正交分量。 还包括多个混频器元件，多个低通滤波器，多个抽取器和多个全通滤波器，其对输入信号的同相和正交分量起作用。 此外，包括减法元件，其被配置为从滤波和下采样的同相分量中减去滤波和下采样的正交分量。

    Radar anti-fade systems and methods
    4.
    发明授权
    Radar anti-fade systems and methods 失效
    雷达防褪色系统和方法

    公开(公告)号：US06731234B1

    公开(公告)日：2004-05-04

    申请号：US10458943

    申请日：2003-06-11

    申请人： James R. Hager ,  Lavell Jordan

    发明人： James R. Hager ,  Lavell Jordan

    IPC分类号： G01S1318

    CPC分类号： G01S13/18 ,  G01S13/22 ,  G01S13/288 ,  G01S13/882

    摘要： A method for suppressing ground return radar fading in a radar altimeter is described. The method includes providing a radar gate width which corresponds to an area that is smaller than an antenna illumination area being impinged by transmissions of the radar altimeter, dithering the radar gate viewing area within the antenna illumination area being impinged by transmissions of the radar altimeter, and taking radar return samples with the radar altimeter.

    摘要翻译： 描述了用于抑制雷达高度计中的地面回波雷达衰落的方法。 该方法包括提供对应于小于被雷达高度计的传输所照射的天线照明区域的区域的雷达门宽度，使由雷达高度计的发射所照射的天线照明区域内的雷达门视野区域抖动， 并用雷达高度计拍摄雷达回波样本。

    Methods and apparatus for weighting radar return data
    6.
    发明授权
    Methods and apparatus for weighting radar return data 有权
    用于加权雷达回波数据的方法和装置

    公开(公告)号：US06738563B1

    公开(公告)日：2004-05-18

    申请号：US10459201

    申请日：2003-06-11

    申请人： James R. Hager ,  Lavell Jordan ,  Thomas W. Heidemann

    发明人： James R. Hager ,  Lavell Jordan ,  Thomas W. Heidemann

    IPC分类号： G01S740

    CPC分类号： G01S13/524 ,  G01S3/48 ,  G01S7/292 ,  G01S7/4004 ,  G01S13/18 ,  G01S13/70 ,  G01S13/882 ,  G01S13/94

    摘要： A method for reducing effects of terrain return fading due to summation of out of phase radar returns in determining locations of radar targets is described. The method comprises determining an interferometric angle, &PHgr;, to a radar target based on at least one radar return and filtering the interferometric angle, &PHgr;, by adjusting an effect of terrain features contributing to the interferometric angle, &PHgr;, proportionally to a degree of radar return fading resulting from the terrain features of the radar targets. A corrected interferometric angle, &PHgr;out., is then provided, based at least in part on the filtering.

    摘要翻译： 描述了一种在确定雷达目标位置时，减少相位雷达回波相加的地形返回衰落影响的方法。 该方法包括：通过基于至少一个雷达返回来确定对雷达目标的干涉角度Phi，并且通过调整对干涉角度Phi的地形特征的影响，并将其与雷达的比例成比例地对干涉角Phi进行滤波 由雷达目标的地形特征返回衰落。 然后，至少部分地基于滤波来提供经校正的干涉角度Phiout。

    Methods and apparatus for optimizing interferometric radar altimeter cross track accuracy
    8.
    发明授权
    Methods and apparatus for optimizing interferometric radar altimeter cross track accuracy 有权
    用于优化干涉雷达高度计交叉轨道精度的方法和装置

    公开(公告)号：US06731236B1

    公开(公告)日：2004-05-04

    申请号：US10459137

    申请日：2003-06-11

    申请人： James R. Hager ,  Larry D. Almsted ,  Lavell Jordan

    发明人： James R. Hager ,  Larry D. Almsted ,  Lavell Jordan

    IPC分类号： G01S740

    CPC分类号： G01S7/4021 ,  G01S13/4454 ,  G01S13/882

    摘要： An apparatus for calibrating a radar altimeter is described. The altimeter provides an angle to a target based on radar energy received at right, left, and ambiguous antennas. The apparatus comprises a turntable on which the radar is mounted, a turntable controller which controls positioning of the radar altimeter, a radar energy source receiving transmit signals from the radar altimeter, a reflector, and a calibration unit. The reflector reflects and collimates radar energy from the radar source towards the radar altimeter. The calibration unit receives an angle from the controller indicative of a position of the radar altimeter with respect to the collimated radar energy and a measured angle from the radar altimeter. The calibration unit calculates a correction based on differences between the angle received from the turntable and the measured angle received from the altimeter and provides the calibration correction to the altimeter.

    摘要翻译： 描述了用于校准雷达高度计的装置。 高度计基于在右，左和不明确的天线处接收到的雷达能量提供与目标的角度。 该装置包括安装有雷达的转盘，控制雷达高度计的定位的转台控制器，接收来自雷达高度计的发射信号的雷达能量源，反射器和校准单元。 反射器将来自雷达源的雷达能量反射并准直到雷达高度计。 校准单元从控制器接收指示雷达高度计相对于准直雷达能量的位置的角度和来自雷达高度计的测量角度。 校准单元基于从转盘接收到的角度与从高度计接收的测量角度之间的差异来计算校正，并向高度计提供校准校正。

    Methods and apparatus for determining an interferometric angle to a target in body coordinates
    9.
    发明授权
    Methods and apparatus for determining an interferometric angle to a target in body coordinates 有权
    用于在身体坐标中确定与目标的干涉角度的方法和装置

    公开(公告)号：US06856279B2

    公开(公告)日：2005-02-15

    申请号：US10144873

    申请日：2002-05-13

    申请人： James R. Hager ,  Lavell Jordan ,  Todd R. Burlet

    发明人： James R. Hager ,  Lavell Jordan ,  Todd R. Burlet

    IPC分类号： G01S13/50 ,  G01S3/48 ,  G01S7/292 ,  G01S13/18 ,  G01S13/20 ,  G01S13/28 ,  G01S13/42 ,  G01S13/524 ,  G01S13/70 ,  G01S13/88 ,  G01S13/94

    CPC分类号： G01S13/524 ,  G01S3/48 ,  G01S7/292 ,  G01S13/18 ,  G01S13/20 ,  G01S13/288 ,  G01S13/42 ,  G01S13/70 ,  G01S13/882 ,  G01S13/94

    摘要： A method for processing radar return data to determine a physical angle, in aircraft body coordinates to a target, is disclosed. The radar return data includes a phase difference between radar return data received at an ambiguous radar channel and a left radar channel, a phase difference between radar return data received at a right radar channel and an ambiguous radar channel, and a phase difference between radar return data received at a right radar channel and a left radar channel. The method includes adjusting a phase bias for the three phase differences, resolving phase ambiguities between the three phase differences to provide a signal, and filtering the signal to provide a physical angle to the target in aircraft body coordinates.

    摘要翻译： 公开了一种用于处理雷达返回数据以确定飞行器对目标的身体坐标中的物理角度的方法。 雷达返回数据包括在不明确的雷达通道接收的雷达返回数据与左雷达通道之间的相位差，在右雷达通道接收的雷达返回数据与模糊雷达通道之间的相位差以及雷达回波之间的相位差 在右雷达通道和左雷达通道接收的数据。 该方法包括调整三相差的相位偏置，解决三相差之间的相位模糊度以提供信号，以及对信号进行滤波以在飞行器机体坐标中向目标提供物理角度。