知搜-全球专利检索

  1. 登录
  2. 注册

搜索结果

170 条记录 (耗时 0.017 秒)

    Coherent pulse doppler altimeter
    1.
    发明授权
    Coherent pulse doppler altimeter 失效
    相干脉冲多普勒高度计

    公开(公告)号：US3739379A

    公开(公告)日：1973-06-12

    申请号：US3739379D

    申请日：1971-02-03

    申请人： HOFFMAN ELECTRONICS CORP

    发明人： DAVIS D

    IPC分类号： G01S13/18 ,  G01S13/53 ,  G01S13/70 ,  G01S13/88 ,  G01S9/10 ,  G01S9/16

    CPC分类号： G01S13/70 ,  G01S13/18 ,  G01S13/53 ,  G01S13/882

    摘要： A coherent pulse doppler altimeter system employing a single antenna wherein the transmit signal is a generated series of pulses the pulse width and repetition frequency of which are varied keeping the average power high although peak transmitter power can be low enough to permit utilization of all solid state components. The ground return pulse will have a doppler shift caused by the vertical component of the aircraft velocity and a doppler spread due to the horizontal velocity. The receiver is tuned to receive the first side band of the return signal. The receiver is range gated by a gate pulse which is varied as the pulse repetition frequency (PRF) is varied so that just the leading edge of a return pulse passes through the gate. Variations in PRF are controlled by the tracking of that leading edge by the range gate. The PRF is then counted to give altitude.

    摘要翻译： 使用单个天线的相干脉冲多普勒高度计系统，其中发射信号是脉冲宽度和重复频率变化的生成的脉冲序列，保持平均功率高，尽管峰值发射机功率可以足够低以允许利用所有固态 组件。 接地返回脉冲将由飞行器速度的垂直分量和由于水平速度的多普勒扩展引起的多普勒频移。 接收机被调谐以接收返回信号的第一边带。 接收机是由脉冲重复频率（PRF）变化而改变的栅极脉冲的范围，使得只有返回脉冲的前沿通过栅极。 PRF的变化通过范围门跟踪该前沿来控制。 然后计算PRF以提供高度。