Method of characterization of an overflown ground from a FM/CW radio altimeter signal
    21.
    发明授权
    Method of characterization of an overflown ground from a FM/CW radio altimeter signal 失效
    从FM / CW无线电高度计信号表征溢出的方法

    公开(公告)号:US06255982B1

    公开(公告)日:2001-07-03

    申请号:US07789371

    申请日:1991-10-28

    申请人: Serge Hethuin

    发明人: Serge Hethuin

    IPC分类号: G01S1332

    CPC分类号: G01S7/412 G01S13/34 G01S13/94

    摘要: The invention proposes a novel method for using the signals provided by an airborne FM/CW radio altimeter, allowing to perform an analysis of the ground overflown by an aircraft for the purpose of, for example, identifying it, or alternatively of recognizing it. The method of the invention consists in analyzing, in the frequency domain, the shape of the spectrum of the beat signal generated by said radio altimeter to characterize said ground so as to extract from it information relating to the reflectivity of said ground.

    摘要翻译: 本发明提出了一种用于使用由空中FM / CW无线电高度计提供的信号的新颖方法,允许为了例如识别飞行器而对飞机的地面溢出进行分析,或者可以识别它。 本发明的方法在于,在频域中分析由所述无线电高度计产生的拍频信号的频谱的形状以表征所述地面,从而从其中提取与所述地面的反射率有关的信息。

    Method of receiving pulses of the M.L.S. type and system for
implementing this method
    22.
    发明授权
    Method of receiving pulses of the M.L.S. type and system for implementing this method 失效
    接收M.L.S.的脉冲的方法 用于实现此方法的类型和系统

    公开(公告)号:US5032840A

    公开(公告)日:1991-07-16

    申请号:US543597

    申请日:1990-06-25

    申请人: Serge Hethuin

    发明人: Serge Hethuin

    IPC分类号: G01S1/54 G01R19/30 G01S1/56

    CPC分类号: G01R19/30 G01S1/56

    摘要: A method of receiving pulses of the M.L.S. type and a system for implementing this method. The method comprises a dividing stage for dividing the received pulse into zones (Z1, . . . Z8). A mean value is determined of the samples within each zone in order to obtain the points PI(1) . . . PI(8). The straight line DR at best passing through these points provides the instant (tMAX) which is the "time" of the pulse.

    摘要翻译: 接收M.L.S的脉冲的方法 类型和实现该方法的系统。 该方法包括用于将接收的脉冲分成区域(Z1,...,Z8)的分割级。 为了获得点PI(1),确定每个区域内的样本的平均值。 。 。 PI(8)。 最好通过这些点的直线DR提供作为脉冲“时间”的时刻(tMAX)。

    Auto-correlation arrangement
    23.
    发明授权
    Auto-correlation arrangement 失效
    自相关布置

    公开(公告)号:US4791599A

    公开(公告)日:1988-12-13

    申请号:US895967

    申请日:1986-08-12

    IPC分类号: G06F17/15 G06F15/20 G06F7/38

    CPC分类号: G06F17/15

    摘要: An auto-correlation apparatus for producing N auto-correlation values R(k), (k=0, . . . N-1) of an auto-correlation function of a sequence of digital samples x(n), (n=-.infin. . . . 0, . . . p) of an input signal, each sample being encoded as words of "b" binary bits, each value R(k) being defined by the formula: ##EQU1## wherein M is the number of digital samples. The apparatus comprises a random access memory for storing at respective addresses therein words (X,R) each of which is a concatenation of a word representing the value of a signal sample (X) and a word representing an auto-correlation value (R). A multiplier cooperating with an adder performs multiplying and summing operations on the M most recent signal sample words in accordance with the formula for R(k). A memory addressing and sequencing member supplies an addressing cycle to the memory for each received signal sample words, and controls the operations of the multiplier and adder.

    摘要翻译: 一种用于产生数字样本序列x(n)的自相关函数的N个自相关值R(k),(k = 0,...,N-1)的自相关装置,(n = INFINITY ... 0,...,p),每个样本被编码为“b”个二进制位的字,每个值R(k)由下式定义:其中M是 数字样品。 该装置包括一个随机存取存储器,用于在其各个地址处存储单词(X,R),每个单词是表示信号样本(X)的值和代表自相关值(R)的单词的级联, 。 与加法器配合的乘法器根据R(k)的公式对M个最新信号采样字执行乘法和求和操作。 存储器寻址和排序成员为每个接收信号采样字向存储器提供寻址周期,并且控制乘法器和加法器的操作。

    Radar device for measuring the distance of the device to a surface
    24.
    发明授权
    Radar device for measuring the distance of the device to a surface 失效
    用于测量设备到表面的距离的雷达设备

    公开(公告)号:US4766436A

    公开(公告)日:1988-08-23

    申请号:US065535

    申请日:1987-06-23

    IPC分类号: G01S7/35 G01S13/34 G01S13/26

    CPC分类号: G01S13/34 G01S13/343

    摘要: This radar device for measuring the distance h of the device to a surface (2) includes transmission means (5) for transmitting to the surface a frequency-modulated wave E(t) provided by an oscillator (14) having a frequency control, receiving means (7) for receiving this wave R(t) reflected from the surface, a mixer circuit (10) for producing a beat wave between the transmitted and received waves and a processing circuit (20) including a beat-wave-digitizing circuit (25) and a time-frequency transform operator (27) for supplying frequency components from which the distance h is determined. This processing circuit (20) further includes an auto-correlation operator for effecting an auto-correlation of the beat wave digitized by the circuit (25) and also spectrum processing means (32) for finally determining the distance h.

    摘要翻译: 用于测量设备到表面(2)的距离h的该雷达设备包括用于向表面发送由具有频率控制的振荡器(14)提供的频率调制波E(t)的发送装置(5) 用于接收从表面反射的该波R(t)的装置(7),用于产生发射波和接收波之间的拍波的混频器电路(10)和包括拍波数字化电路(20)的处理电路(20) 25)和用于提供确定距离h的频率分量的时频变换算子(27)。 该处理电路(20)还包括自相关运算器,用于实现由电路(25)数字化的拍波的自相关,以及用于最终确定距离h的频谱处理装置(32)。