MTI Radar comprising a processor selectively operable as a Weibull and a
Rayleigh clutter suppressor
    1.
    发明授权
    MTI Radar comprising a processor selectively operable as a Weibull and a Rayleigh clutter suppressor 失效
    MTI雷达包括可选择性地操作为威布尔和瑞利杂波抑制器的处理器

    公开(公告)号:US4318101A

    公开(公告)日:1982-03-02

    申请号:US129457

    申请日:1980-03-11

    IPC分类号: G01S7/32 G01S7/292 G01S13/52

    CPC分类号: G01S7/2927

    摘要: In an MTI radar receiver, a clutter suppressor (46, 47, 48) is switched (72), under the control of a discriminating device (71) responsive either to the shape parameter .eta. of the Weibull distribution or an average level of a clutter suppressed signal, to be selectively operable as a Weibull and a Rayleigh clutter suppressor for best possible LOG/CFAR processing with simple cell averaging circuitry. The suppressor may comprise a first processor (61) combined with an .eta. parameter calculator (48) for converting the Weibull clutter to the Rayleigh clutter, a second processor (89) for timing, and a simple suppressor (62) for the Rayleigh clutter. (FIG. 6).

    摘要翻译: 在MTI雷达接收机中,在识别装置(71)的控制下,对威布尔分布的形状参数eta或杂波的平均水平进行响应,切换杂波抑制器(46,47,48) 抑制信号,以选择性地操作为威布尔和瑞利杂波抑制器,以利用简单的单元平均电路进行最佳可能的LOG / CFAR处理。 抑制器可以包括与eta参数计算器(48)组合的用于将威布尔杂波转换为瑞利杂波的第一处理器(61),用于定时的第二处理器(89)和用于瑞利杂波的简单抑制器(62)。 (图6)。

    Moving target indication radar
    2.
    发明授权
    Moving target indication radar 失效
    移动目标指示雷达

    公开(公告)号:US4222050A

    公开(公告)日:1980-09-09

    申请号:US961169

    申请日:1978-11-16

    IPC分类号: G01S7/292 G01S13/532 G01S9/42

    CPC分类号: G01S13/532 G01S7/292

    摘要: A moving target indication radar (MTI) having a high azimuthal position detection accuracy. The received radar return signal is separated into quadrature components which are each converted to a series of digital samples. A continuous discrete fast Fourier transform is then performed on groups of samples corresponding to a predetermined number of contiguous azimuthal units of identical range producing an equal number of output Doppler frequency components which represent the relative speeds of stationary and moving objects within the contiguous azimuthal units. A new separate transform operation is performed for each new sample received. The transform outputs are processed to separately detect the stationary and moving objects.

    摘要翻译: 具有高方位位置检测精度的移动目标指示雷达(MTI)。 接收到的雷达返回信号被分成正交分量,每个分量被转换成一系列数字采样。 然后对与相同范围的预定数量的连续方位角单位相对应的样本组执行连续离散快速傅立叶变换,产生相等数量的输出多普勒频率分量,其表示连续方位角单位内的静止和移动物体的相对速度。 对接收到的每个新样本执行新的单独变换操作。 处理变换输出以分别检测静止和移动的物体。

    Adaptive constant false alarm rate (CFAR) processor
    4.
    发明授权
    Adaptive constant false alarm rate (CFAR) processor 失效
    自适应恒定误报率(CFAR)处理器

    公开(公告)号:US4513286A

    公开(公告)日:1985-04-23

    申请号:US364334

    申请日:1982-04-01

    申请人: Takeru Irabu

    发明人: Takeru Irabu

    IPC分类号: G01S7/32 G01S7/292 G01S7/34

    CPC分类号: G01S7/2927

    摘要: The incoming radar signals to a constant false alarm rate (CFAR) processor, having some known cumulative distribution function F(X) or probability density function f(X), are transformed into new signals Y according to the equationY=.sigma.[-1n {1-F.sub.x (X)}].sup.1/Kwhere .sigma. and K are a scale parameter and shape parameter, respectively, and can be arbitrarily set. The threshold to which the processed signal is compared in the CFAR processing is variable in accordance with the selected value of K.

    摘要翻译: 具有一些已知的累积分布函数F(X)或概率密度函数f(X)的恒定误报率(CFAR)处理器的输入雷达信号根据等式Y = sigma [-1n {1-Fx(X)}] 1 / K其中sigma和K分别是比例参数和形状参数,可以任意设置。 在CFAR处理中比较处理信号的阈值根据所选择的K值而变化。

    Moving target indication radar
    5.
    发明授权
    Moving target indication radar 失效
    移动目标指示雷达

    公开(公告)号:US4053885A

    公开(公告)日:1977-10-11

    申请号:US673323

    申请日:1976-04-05

    CPC分类号: G01S13/5246 G01S13/532

    摘要: A moving target indication radar is disclosed in which the zero-Doppler-speed components of the radar return signal are eliminated by correlation processing in the azimuthal direction. In some cases, a similar correlation processing is concurrently performed in the range direction. The moving target indication radar has both a radar signal analog processing portion and a radar signal digital processing portion. The received pulse returns are processed by quadrature phase detectors to provide outputs which are in phase and quadrature phase analog data signals representing real and imaginary parts of the Doppler frequency data. These signals are converted to corresponding digital words which are then divided into a plurality of digital Doppler frequency components by a discrete Fourier transform circuit. A buffer memory is connected to store the outputs of the discrete Fourier transform circuit. An amplitude calculator selectively receives the outputs of the buffer memory and computes the root-mean-square value for each output of the discrete Fourier transform circuit stored in the buffer memory. A second buffer memory is connected to store the outputs of the amplitude calculator, and a correlation processing circuit averages the outputs of the second buffer memory which represent the data of a plurality of every n-th one of the unit azimuthal regions and subtracts the average output from the data for the center of the plurality of unit regions.

    摘要翻译: 公开了一种移动目标指示雷达,其中通过方位角方向的相关处理消除了雷达返回信号的零多普勒速度分量。 在一些情况下,在范围方向上同时执行类似的相关处理。 移动目标指示雷达具有雷达信号模拟处理部分和雷达信号数字处理部分。 接收到的脉冲返回由正交相位检测器处理,以提供表示多普勒频率数据的实部和虚部的同相和正交相位模拟数据信号的输出。 这些信号被转换成相应的数字字,然后通过离散傅里叶变换电路被分成多个数字多普勒频率分量。 连接缓冲存储器来存储离散付里叶变换电路的输出。 振幅计算器选择性地接收缓冲存储器的输出,并计算存储在缓冲存储器中的离散傅立叶变换电路的每个输出的均方根值。 连接第二缓冲存储器以存储幅度计算器的输出,相关处理电路对代表单位方位角区域中的第n个多个的数据的第二缓冲存储器的输出进行平均,并且减去平均值 从多个单位区域的中心的数据输出。