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    • 1. 发明授权
    • Threshold voltage generator
    • 阈值电压发生器
    • US4431993A
    • 1984-02-14
    • US228529
    • 1981-01-26
    • Jacobus Van Der Mark
    • Jacobus Van Der Mark
    • G01S7/32G01S7/292G01S9/00
    • G01S7/2922G01S7/2927
    • Threshold circuit for selecting video signals derived from small stationary and moving objects amidst an abundance of clutter in a harbor area. The threshold voltage generator (1) of this circuit is suitable for detecting the temporal average .DELTA.P of the positive peak value and the temporal average .DELTA.N of the negative peak value from the AC component of the applied video voltage (V.sub.DC +V.sub.AC) and for generating modified voltages (l+k)(V.sub.AC -.DELTA.P) and k(-V.sub.AC -.DELTA.N). The modified voltages together with the inverted video voltage are combined to form the threshold voltage V=V.sub.DC +.DELTA.P+k(.DELTA.P+.DELTA.N) being k times the average peak-peak value above the average peak value of the video voltage, where k is a constant.
    • 阈值电路,用于选择从小型静止和移动物体得到的视频信号,这些信号在港口区域有大量杂波。 该电路的阈值电压发生器(1)适合于检测来自所施加的视频电压(VDC + VAC)的AC分量的正峰值的时间平均DELTA P和负峰值的时间平均DELTA N和 用于产生修正电压(1 + k)(VAC-DELTA P)和k(-VAC-DELTA N)。 将修正的电压与反转的视频电压一起组合,以形成高于视频电压的平均峰值的平均峰 - 峰值的k倍的阈值电压V = VDC + DELTA P + k(DELTA P + DELTA N),其中k 是一个常数。
    • 2. 发明授权
    • Digital pulse compression filter
    • 数字脉冲压缩滤波器
    • US4673941A
    • 1987-06-16
    • US672517
    • 1984-11-19
    • Jacobus Van Der Mark
    • Jacobus Van Der Mark
    • G01S7/288G01S13/28H03H17/00G01S7/28
    • G01S7/288G01S13/282
    • A digital pulse compression filter for use in a radar or sonar transmitting and receiving unit to process sampled and digitized signals. The sampling frequency (f.sub.s) is equal to about four times the center frequency (f.sub.o) and greater than about twice the bandwidth (.DELTA.f) of these signals. The pulse compression filter (5) comprises a time correlation circuit (7) supplied on the one hand with the sampled and digitized signals and on the other hand with signals representing a replica of the radar or sonar transmitter pulse, whereby one of the two types of signals supplied to the correlation circuit (7) is correlated with the orthogonal components of the other type of signals supplied to the correlation circuit (7) to obtain the orthogonal components of the compressed pulse.
    • 一种用于雷达或声纳发射和接收单元处理采样和数字化信号的数字脉冲压缩滤波器。 采样频率(fs)等于中心频率(fo)的大约四倍,大于这些信号的两倍带宽(DELTA f)。 脉冲压缩滤波器(5)包括一方面提供了采样和数字化信号的时间相关电路(7),另一方面具有代表雷达或声纳发射机脉冲的复制品的信号,由此两种类型之一 提供给相关电路(7)的信号与提供给相关电路(7)的其他类型的信号的正交分量相关,以获得压缩脉冲的正交分量。