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公开(公告)号：US4093949A
公开(公告)日：1978-06-06
申请号：US690330
申请日：1976-05-26
申请人： Norol T. Evans
发明人： Norol T. Evans
IPC分类号： G01S13/524 , G01S9/02 , G01S9/42
CPC分类号： G01S13/5244
摘要： A clutter tracker in which received clutter velocity signal is shifted to zero doppler in order that optimum moving target indicator (MTI) cancellaton can be achieved is disclosed. A frequency controllable voltage controlled crystal oscillator (VCXO) is used as the coherent oscillator (COHO) source. The subject digital system changes the VCXO output bus only once per dwell, thus allowing adequate filtering to achieve desired performance without adversely affecting tracking performance.
摘要翻译： 公开了一种杂波跟踪器，其中接收到的杂波速度信号被转移到零多普勒，以便可以实现最佳移动目标指示符（MTI）消除。 频率可控压控晶体振荡器（VCXO）被用作相干振荡器（COHO）源。 主题数字系统每停留一次改变VCXO输出总线，从而允许充分的滤波以达到所需的性能，而不会对跟踪性能产生不利影响。
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公开(公告)号：US4021805A
公开(公告)日：1977-05-03
申请号：US210256
申请日：1971-12-20
申请人： David D. Effinger , Norol T. Evans
发明人： David D. Effinger , Norol T. Evans
CPC分类号： G01S7/2813 , H01Q3/2629
摘要： A logarithmetic sidelobe blanking system operable in a pulse compression radar system in which the dynamic range of the blanking system is not limited by the compression dynamic range. A sidelobe blanking receiver is provided to process the sidelobe signals in a manner identical to the processing in the radar receiver. The uncompressed IF pulses in both the sidelobe receiver and the main lobe receiver are sampled prior to their being amplitude limited, and are applied through logarithmetic amplifiers whose dynamic range capability is at least equal to the dynamic range of the preceding circuits. The output signals of the logarithmetic amplifiers are then compared and if the sidelobe signal is larger than the main lobe signal the compressed pulse at the output of the pulse compressor is located and used for blanking to ensure that only the time interval of the compressed pulse width is removed. As sampling is made prior to the threshold or amplitude limiting circuit, the full dynamic range of the receiver is processed. The sidelobe receiver system in accordance with the invention also includes an arrangement for selecting the above described sampling prior to threshold operation when the input signal is limited and for selecting operation with normal sidelobe blanking comparison of compressed sidelobe signals when the input signal is at a level lower than the limiting amplitude of the channels.
摘要翻译： 可在脉冲压缩雷达系统中操作的对数算子旁瓣消隐系统，其中消隐系统的动态范围不受压缩动态范围的限制。 提供旁瓣消隐接收机，以与雷达接收机中的处理相同的方式处理旁瓣信号。 旁瓣接收机和主波瓣接收机中的未压缩IF脉冲在其受限制之前被采样，并且通过其动态范围能力至少等于先前电路的动态范围的对数算术放大器来施加。 然后比较对数运算放大器的输出信号，并且如果旁瓣信号大于主瓣信号，脉冲压缩器输出处的压缩脉冲被定位并用于消隐，以确保仅压缩脉冲宽度的时间间隔 被删除。 由于在阈值或幅度限制电路之前进行采样，所以处理接收器的全部动态范围。 根据本发明的旁瓣接收机系统还包括一种用于在输入信号受限时在阈值操作之前选择上述采样的装置，并且当输入信号处于等级时用于选择具有正常旁瓣消隐的压缩旁瓣信号比较 低于通道的限幅。
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公开(公告)号：US4041487A
公开(公告)日：1977-08-09
申请号：US654822
申请日：1976-02-03
CPC分类号： G01S13/68
摘要： A radar set for providing accurate low elevation angle tracking of targets by means of controlling the magnitudes of radar detection level which are sequentially switched so that either of a pair of beams is greater in magnitude than is used for two beam tracking.
摘要翻译： 一种用于通过控制雷达检测电平的大小来提供目标的精确低仰角跟踪的雷达组，其被顺序地切换，使得一对波束中的任一个的幅度大于用于两个波束跟踪的幅度。
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公开(公告)号：US3962704A
公开(公告)日：1976-06-08
申请号：US475217
申请日：1974-05-31
申请人： Norol T. Evans
发明人： Norol T. Evans
IPC分类号： G01S13/526 , G01S9/42
CPC分类号： G01S13/526
摘要： An improved MTI (Moving Target Indicator) cancelling system that provides cancellation in the first canceller stage of clutter at a first frequency and cancellation in a second or subsequent canceller stage of clutter such as weather or chaff with a substantial doppler frequency offset from that cancelled in the first MTI canceller. The first canceller stage may be a conventional in-phase (I) and in-quadrature (Q) digital MTI unit to develop the I and Q first differences followed by a conversion of these differences into a combined first difference designated as a quantity M and representing an angle times an amplitude multiplier. This M signal is then applied to a second canceller to develop a second difference signal which is then normalized to represent a pure angle term. A computer then determines the average angular error percentage over a selected number of adjacent range bins at each range bin interval and this percent error is then multiplied by the time aligned value of M to provide an actual error and a modified value of M is developed by subtracting the actual error from the value of M. The modified first difference signal is then subtracted from the delayed first difference signal to generate a second difference output signal with the undesired clutter at different doppler frequencies being cancelled.
摘要翻译： 一种改进的MTI（移动目标指示符）取消系统，其以第一频率在第一消除级杂波阶段提供消除，并且在第二或随后的杂波消除级别（例如天气或谷壳）中消除具有基本上多普勒频率偏移的消除 第一个MTI消除器。 第一消除级可以是传统的同相（I）和正交（Q）数字MTI单元，以开发I和Q的第一差异，随后将这些差异转换为指定为数量M的组合的第一差异， 表示一个角度乘以幅度乘数。 然后将该M信号施加到第二消除器以产生第二差分信号，然后对其进行归一化以表示纯角度项。 然后，计算机确定在每个范围仓间隔上在所选数量的相邻范围仓上的平均角误差百分比，然后将该百分比误差乘以M的时间对准值以提供实际误差，并且修改的M由M开发 从M值减去实际误差。然后从延迟的第一差分信号中减去修改的第一差分信号，以产生第二差分输出信号，其中不同的多普勒频率处的不期望的杂波被消除。
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公开(公告)号：US5572215A
公开(公告)日：1996-11-05
申请号：US634024
申请日：1967-04-13
申请人： Norol T. Evans , Duane R. Ritchie
发明人： Norol T. Evans , Duane R. Ritchie
CPC分类号： G01S7/2922 , G01S7/36 , G01S13/10
摘要： A plurality of threshold detectors is provided to pass analog signals of predetermined and varying threshold values. An analog to digital converter converts these analog signals to binary 1s and 0s. A target detected on each radar beam sweep is a 1 and no target is a 0. These binary numbers are then stored in a reversible up-down counter. At the first signal received, the counter counts up on hits (binary 1) and counts down on misses (binary 0). When the contents of the counter reaches a predetermined count, a target's leading edge is declared. At this time, the counter is then reset and proceeds to count up on misses and down on hits until the aforesaid predetermined count is attained, wherein a trailing edge is then declared.
摘要翻译： 提供多个阈值检测器以传递预定和变化的阈值的模拟信号。 模数转换器将这些模拟信号转换为二进制1和0。 在每个雷达波束扫描上检测到的目标是1，没有目标是0.这些二进制数然后存储在可逆的升降计数器中。 在接收到的第一个信号时，计数器在命中（二进制1）上递增计数，并计数下降（二进制0）。 当计数器的内容达到预定计数时，将声明目标的前沿。 此时，计数器然后被重新设置，并且继续进行计数，并且在命中之前下降，直到达到上述预定计数，然后声明后沿。
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公开(公告)号：US4422074A
公开(公告)日：1983-12-20
申请号：US458971
申请日：1965-05-26
CPC分类号： G01S7/2927
摘要： 1. A system responsive to a composite signal including first signals in the presence of second signals and detecting the presence of said first signals with a selected threshold level ratio of signal voltage to noise voltage comprisingmeans for integrating the composite signal over selected intervals of time,means for comparing a selectable threshold level with the integrated signals,means for storing data to provide said threshold level,counting means responsive to the integrated signals exceeding the threshold level to accumulate a count thereof,constant selector means responsive to the count of said counting means to establish a proportion of the value of said stored data for changing said threshold level to maintain the selected threshold level ratio,and means responsive to said constant selector means for correcting the stored data after a selected number of said intervals of time.
摘要翻译： 1.一种在存在第二信号的情况下响应于包括第一信号的复合信号的系统，并且利用所选择的信号电压与噪声电压的阈值电平比检测所述第一信号的存在，所述阈值电平包括用于在选定的时间间隔上对复合信号进行积分的装置 用于将可选择的阈值电平与积分信号进行比较的装置，用于存储数据以提供所述阈值电平的装置，响应于超过阈值电平的积分信号累积其计数的计数装置，响应于所述计数的计数的常数选择器装置 用于建立用于改变所述阈值电平以维持所选阈值电平比率的所述存储数据的值的一部分的装置，以及响应于所述常数选择器装置在所选择的所述时间间隔之后校正所存储的数据的装置。
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公开(公告)号：US4042924A
公开(公告)日：1977-08-16
申请号：US17992
申请日：1970-02-25
IPC分类号： G01S13/526 , G01S9/42
CPC分类号： G01S13/5265
摘要： A clutter tracking and cancelling system, for use in a MTI radar system, comprising an auxiliary channel consisting primarily of a phase detector and a canceller. The phase detector provides an output which represents the phase difference between the IF and the coho output, while the output of the canceller, which responds to the phase detector output, represents clutter MTI residue from one transmission to the next. Clutter MTI residue from several successive range bins is smoothed and integrated to provide a control output which is used to shift the phase of the coho frequency, which is supplied to the phase detector in the conventional main MTI channel, to set the mean clutter velocity at zero velocity in order to produce optimum clutter cancellation in the main MTI channel.
摘要翻译： 用于MTI雷达系统的杂波跟踪和消除系统，包括主要由相位检测器和消除器组成的辅助信道。 相位检测器提供一个表示IF和同轴输出之间的相位差的输出，而响应相位检测器输出的消除器的输出表示从一个传输到下一个传输的杂波MTI残差。 来自几个连续范围箱的杂波MTI残留被平滑和积分以提供控制输出，其用于将提供给常规主MTI通道中的相位检测器的同频率的相位移位，以将平均杂波速度设置在 零速度，以便在主MTI通道中产生最佳的杂波消除。
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公开(公告)号：US5307069A
公开(公告)日：1994-04-26
申请号：US412217
申请日：1973-11-02
申请人： Norol T. Evans
发明人： Norol T. Evans
CPC分类号： G01S7/2813 , G01S7/36
摘要： An improved radar receiver having side lobe blanking and coherent side lobe cancellation circuits in the main receiver channel and a control arrangement that overcomes the conventional problem that the side lobe blanking circuit will also blank a noise jammer signal even after the coherent side lobe canceller circuits have acquired the jamming energy. In this system, the side lobe blanking circuits are mechanized with a logarithmic amplifier and with a fast time constant circuit in an auxiliary receiver channel. The fast time constant is selected to match or be slightly longer than the acquisition time constant of the coherent side lobe cancellers. This implementation allows the side lobe blanking circuits to be energized at all times, thus simplifying the operational control of the system. In some arrangements in accordance with the invention the fast time constant may be varied as a function of the amplitude of the jamming signal in the main channel.
摘要翻译： 一种改进的雷达接收机，在主接收机通道中具有旁瓣消隐和相干旁瓣消除电路，以及克服常规问题的控制装置，即使在相干旁瓣消除器电路具有的旁瓣消隐电路也将消除噪声干扰信号 获得了干扰能量。 在该系统中，旁瓣消隐电路用对数放大器和辅助接收器通道中的快速时间常数电路进行机械化。 选择快速时间常数以匹配或稍长于相干旁瓣消除器的获取时间常数。 该实现允许旁瓣消隐电路始终通电，从而简化了系统的操作控制。 在根据本发明的一些布置中，快速时间常数可以作为主通道中的干扰信号的幅度的函数而变化。
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公开(公告)号：US5291209A
公开(公告)日：1994-03-01
申请号：US413402
申请日：1973-11-02
申请人： Norol T. Evans , Richard F. Hyneman
发明人： Norol T. Evans , Richard F. Hyneman
CPC分类号： G01S7/2813
摘要： The elimination of jamming signals from received radar signals is conventionally accomplished by side lobe cancellation techniques. Large interfering signals caused either by clutter or other sources, however, can cause intolerable degradation of coherent side lobe cancellation (CSLC) systems. In the present invention an inhibit signal is used to open the input to the coherent side lobe cancellation error sensing circuits thus preventing large signals from entering the coherent side lobe cancellation loop. Large signals entering coherent side lobe cancellation loops give rise to erroneous transients in the output. The invention effects storage of previously sensed error signals so as to continue jammer cancellation until new data become available to update the error signals. The inhibit signal is generated by a combination of coherent side lobe cancellation sensing circuits and logic control circuits that determine when an inhibit signal should be generated. When an inhibit signal is not present, the coherent side lobe cancellation loop operates in its normal fashion. During intervals when excessive clutter or signal is present on the main channel, an inhibit signal is generated causing the occurrence of two actions in the coherent side lobe cancellation loop. First, the inhibit signal opens a switch at the output of the correlation mixer so that no input is accepted into the coherent side lobe cancellation loop for a time interval, thereby preventing the large signal from disturbing the loop operation. Second and simultaneously, the inhibit signal causes a sample-and-hold circuit to sample the loop filter output thereby preventing the loops from relaxing during this time interval.
摘要翻译： 通常通过旁瓣消除技术来实现从接收到的雷达信号中消除干扰信号。 然而，由杂波或其他源引起的大干扰信号可能导致相干旁瓣消除（CSLC）系统的不可容忍的退化。 在本发明中，使用禁止信号来打开相干旁瓣消除误差检测电路的输入，从而防止大信号进入相干旁瓣消除环路。 进入相干旁瓣消除环路的大信号会导致输出中的错误瞬变。 本发明影响先前感测到的误差信号的存储，以便继续干扰消除，直到新数据变得可用以更新误差信号。 禁止信号由确定何时应产生抑制信号的相干旁瓣消除感测电路和逻辑控制电路的组合产生。 当禁止信号不存在时，相干旁瓣消除环路以其正常方式工作。 在主通道上存在过大的杂波或信号的间隔期间，产生禁止信号，导致在相干旁瓣消除环路中发生两个动作。 首先，禁止信号在相关混频器的输出处打开一个开关，使得在一段时间间隔内没有输入被接收到相干旁瓣消除环路中，从而防止大信号扰乱环路操作。 第二并且同时，禁止信号使采样和保持电路对环路滤波器输出采样，从而防止在该时间间隔期间环路放松。
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公开(公告)号：US4369445A
公开(公告)日：1983-01-18
申请号：US538171
申请日：1966-03-23
申请人： Norol T. Evans , Robert B. Nelson
发明人： Norol T. Evans , Robert B. Nelson
摘要： A video processor that responds to the video signals received from a group of radar receivers to automatically select the video that is least affected by ECM environment in which the receivers operate. Each receiver in the group has known ECM characteristics so that the effect of different forms of ECM on its video output signals may be detected. By continually monitoring the video output signals different receivers are continually selected to minimize the effect of ECM environment on the radar operation.
摘要翻译： 视频处理器，响应从一组雷达接收器接收的视频信号，以自动选择受接收器操作的ECM环境影响最小的视频。 该组中的每个接收机已知ECM特性，使得可以检测不同形式的ECM对其视频输出信号的影响。 通过不断地监视视频输出信号，不断接收不同的接收机以最小化ECM环境对雷达操作的影响。
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