公开(公告)号：US4107679A

公开(公告)日：1978-08-15

申请号：US777110

申请日：1977-03-14

申请人： Raymond Strauch ,  Michel Riffiod

发明人： Raymond Strauch ,  Michel Riffiod

IPC分类号： G01S7/40 ,  G01S13/34 ,  H03C3/09 ,  G01S9/26

CPC分类号： H03C3/09 ,  G01S13/341 ,  G01S13/882

摘要： A range measuring apparatus of the linear frequency modulation type is disclosed which comprises a measuring control loop for rendering the beat frequency between the transmitted and received frequencies equal to a fixed frequency. The apparatus further includes means for forming a permanent second beat signal between two signals derived from the generator supplying the frequency modulated signal, one of these signals being delayed by means of the delay line. A phase detector receives this second pulsed signal and the signal of a controlled frequency oscillator and supplies a signal which controls the slope of the frequency modulation. The error signal of the measuring control loop controls the frequency of the signal from the oscillator. This arrangement results in an increased precision in the range measurements.

摘要翻译： 公开了一种线性频率调制方式的量程测量装置，其包括用于使发送频率和接收频率之间的频率等于固定频率的测量控制回路。 该装置还包括用于在从提供频率调制信号的发生器导出的两个信号之间形成永久的第二差拍信号的装置，这些信号中的一个借助延迟线被延迟。 相位检测器接收该第二脉冲信号和受控频率振荡器的信号，并提供控制频率调制斜率的信号。 测量控制回路的误差信号控制来自振荡器的信号的频率。 这种布置导致距离测量的精度提高。

公开(公告)号：US4661818A

公开(公告)日：1987-04-28

申请号：US543066

申请日：1983-10-13

申请人： Michel Riffiod ,  Jean-Pierre Tomasi

发明人： Michel Riffiod ,  Jean-Pierre Tomasi

IPC分类号： G01S7/40 ,  G01S13/88

CPC分类号： G01S7/4056 ,  G01S13/882 ,  G01S2007/4065

摘要： A simulator is provided for testing a radio altimeter of the type which emits a frequency-modulated wave, the modulation being according to linear segments of slope p, and which compares the frequencies of the emitted wave and of the wave which is received after reflection to provide a distance measurement. The simulator according to the invention is connected between the transmitting antenna and the receiving antenna of the altimeter, and comprises two signal-processing chains which are arranged, in parallel, between a receiving section and an SSB mixer, the output terminal of which is connected to a transmitting section. The first chain is formed by first devices, which generate a quantity G, which is proportional to p, and second devices, which generate a signal possessing a frequency f.sub.d, the ratio of f.sub.d and G assuming a predetermined, adjustable ratio, Q. The second chain is formed by a coupler which is connected to a variable attenuator. The SSB beats substractively between the two signals which it receives.

摘要翻译： 提供了一种模拟器，用于测试发射频率调制波的类型的无线电高度计，该调制根据斜率p的线性段，并将发射波和反射后接收的波的频率进行比较 提供距离测量。 根据本发明的模拟器连接在高度计的发射天线和接收天线之间，并且包括两个信号处理链，它们并联地布置在接收部分和SSB混频器之间，其输出端连接 发送部分。 第一链由第一装置形成，第一装置产生与p成比例的量G，第二装置产生具有频率fd的信号，fd和G的比率假定为预定的可调节比率Q。 第二链由连接到可变衰减器的耦合器形成。 SSB在接收到的两个信号之间下降。