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    • 5. 发明授权
    • Demodulation filter for a signal modulated in binary frequency manner
    • 用二进制频率调制的信号的解调滤波器
    • US4543547A
    • 1985-09-24
    • US485282
    • 1983-04-15
    • Jean-Edgar PicquendarJeannine HenaffMichel Feldmann
    • Jean-Edgar PicquendarJeannine HenaffMichel Feldmann
    • H03H9/72H04L27/148H03H9/145H03H9/64
    • H03H9/72H04L27/148
    • The invention relates to a filter for demodulating signals modulated in frequency in binary manner by the switching of two frequencies F.sub.a and F.sub.b.On a piezoelectric crystal, is produced two surface wave filtering units, each comprising a transmitting transducer and a receiving transducer with interdigitated electrodes. The number of electrodes of the receiving transducer of the first unit is substantially equal to twice (2F.sub.a -F.sub.b)/2(F.sub.b -F.sub.a ) with a spacing of v/(2F.sub.a -F.sub.b), in which v is the propagation rate. In the case of the second unit, this number is approximately twice (2F.sub.b -F.sub.a)/2(F.sub.b -F.sub.a) with a spacing of v/(2F.sub.b -F.sub.a). The receiving transducers are preferably subdivided in each case into two juxtaposed transducers, whereof one is set back with respect to the other by a distance of approximately v/4F.sub.a for the first unit and v/4F.sub.b for the second.
    • 本发明涉及一种滤波器,用于通过切换两个频率Fa和Fb以二进制方式解调以频率调制的信号。 在压电晶体上,产生两个表面波滤波单元,每个表面波滤波单元包括发射换能器和具有交叉指电极的接收换能器。 第一单元的接收换能器的电极的数量基本上等于具有v /(2Fa-Fb)间隔的两倍(2Fa-Fb)/ 2(Fb-Fa),其中v是传播速率。 在第二单元的情况下,该数量大约是间隔为v /(2Fb-Fa)的两倍(2Fb-Fa)/ 2(Fb-Fa)。 接收传感器优选地在每种情况下分为两个并置的换能器,其中一个相对于另一个换能器相对于第一单元以大约v / 4Fa的距离和第二单元的v / 4Fb为背。
    • 8. 发明授权
    • Clutter elimination radar
    • 杂波消除雷达
    • US4804962A
    • 1989-02-14
    • US520205
    • 1983-08-04
    • Jean-Edgar Picquendar
    • Jean-Edgar Picquendar
    • G01S7/292G01S13/522H03H7/06G01S7/28H03H7/12
    • H03H7/1783G01S13/522G01S7/2921H03H7/06H03H7/07
    • A radar receiver having a clutter-elimination filter in the receiver's intermediate frequency stage. The filter is centered on the intermediate frequency f.sub.i and has a transfer function in which a band-pass characteristic is superimposed on a band-rejection characteristic. The band-pass response has a principal lobe substantially conforming to the function (sin x)/x with x=(w-w.sub.i).pi.T. The band-rejection response presents an attenuation zone centered about f.sub.i ; this zone is wide enough to suppress much of the response from clutter but narrow enough to avoid suppressing much of the energy in the echo from the target. For example, the width of the attenuation zone may be from about f.sub.i -0.2/T to about f.sub.i +0.2/T. The filter provides a maximum response on each side of the attenuation zone, spaced from f.sub.i by about 0.4/T Hz in each direction. Outside the maxima, the response is dominated by the band-pass characteristic and achieves transmission minima at about 1/T Hz above and below f.sub.i. Examples are given of filters providing such transfer functions.
    • 在接收机的中频阶段具有杂波消除滤波器的雷达接收机。 滤波器以中间频率fi为中心,并具有传输函数,其中带通特性叠加在带阻特性上。 带通响应具有基本上符合x =(w-wi)pi T的函数(sin x)/ x的主瓣。带阻响应呈现以fi为中心的衰减区; 该区域足够大以抑制来自杂波的大部分响应,但足够窄以避免抑制来自目标的回波中的大部分能量。 例如,衰减区域的宽度可以是从大约0.10-0.2 / T到大约fi + 0.2 / T。 滤波器在衰减区的每一侧提供最大响应,每个方向与fi分开大约0.4 / T Hz。 在最大值之外,响应由带通特性支配,并达到高于和低于fi的1 / T Hz的传输最小值。 给出了提供这种传递函数的滤波器的例子。