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1.发明授权System for protecting a vehicle-borne tracking radar against an off-target jammer 失效用于保护车载跟踪雷达免受目标内干扰的系统
公开(公告)号：US4190837A
公开(公告)日：1980-02-26
申请号：US915983
申请日：1978-06-16
CPC分类号： G01S7/36 , G01S13/4418
摘要： A protective system for a vehicle-borne tracking radar, designed to counter the effect of an off-target jammer whose interfering signals are picked up by a directive antenna together with echoes from an actual target, comprises a receiver with a sum channel and a difference channel. In the absence of a jammer, the sum channel is connected via a signal processor to telemetric circuitry in the radar associated with the vehicular guidance system which keeps the antenna axis trained upon the target as the vehicle homes in on same. When a strong jamming signal is detected, a switching device in the processor cuts off the sum channel from the telemetric circuitry and supplies the latter, instead, with rectified error signals from the difference channel, these error signals being also delivered prior to rectification to a tracking-control circuit which energizes an antenna rotator to hold its axis in line with the jammer. The presence of a jammer may be detected by a signal-level comparator with two circuit branches connected to the sum channel, these branches including respective integrators which are alternately supplied with incoming signals in a target window and in a jammer window occurring at different instants of a recurrence period. Another possible jammer-signal detector, which may be included in the processor, receives the rectified error signal from the difference channel in the target window and produces a "jammer present" signal whenever the accumulated error signals exceed a predetermined threshold.
摘要翻译： 一种用于车载跟踪雷达的保护系统，其被设计成用于抵消由干扰信号由指向天线拾取的偏移目标干扰器以及来自实际目标的回波的影响，包括具有和信道和差分的接收机 渠道。 在没有干扰器的情况下，总和信道通过信号处理器连接到与车辆引导系统相关联的雷达中的遥测电路，当车辆驻车在同一个位置时，将天线轴训练在目标上。 当检测到强干扰信号时，处理器中的切换装置从遥测电路中切断和信道，并将差分信号提供给来自差分信道的经整流的误差信号，这些误差信号也在纠正之前传送到 跟踪控制电路，其激励天线旋转器以保持其轴线与干扰器一致。 干扰信号的存在可以由具有连接到和信道的两个电路分支的信号电平比较器来检测，这些分支包括相应的积分器，其交替地提供目标窗口中的输入信号和在不同时刻发生的干扰窗口 复发期。 可能包含在处理器中的另一种可能的干扰信号检测器，只要累积的误差信号超过预定阈值，就从目标窗口中的差分信道接收经整流的误差信号并产生“干扰器存在”信号。
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公开(公告)号：US4143372A
公开(公告)日：1979-03-06
申请号：US837861
申请日：1977-09-29
CPC分类号： G01S13/762 , G01S7/2813
摘要： The invention relates to an arrangement for suppressing the echos received in the side lobes of a main antenna of a radar system. An auxiliary antenna, whose diagram overlaps with the side lobes of the main antenna, supplies a signal B which is compared with the signal A from the main antenna. The comparison is performed between microwave signals or intermediate frequency signals by means of an operating circuit which emits signals S.sub.1 = A + k.sub.1 B and S.sub.2 = k.sub.2 (A - k.sub.1 B) where k.sub.1 and k.sub.2 are amplitude and phase modifying complex coefficients, and an amplitude and phase demodulating circuit which receives S.sub.1 and S.sub.2, one of which may possibly be in phase quadrature. The presence of an off-center echo, for example, results in a threshold being exceeded by the filtered demodulated signal.
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3.发明授权Arrangement for discriminating clutter signals from target signals in a radar system 失效从雷达系统中的目标信号中分离出离散信号的安排
公开(公告)号：US4143371A
公开(公告)日：1979-03-06
申请号：US840712
申请日：1977-10-11
CPC分类号： G01S7/34 , G01S13/4418 , G01S7/2921
摘要： An arrangement for protecting radars against unwanted echos such as "clutter" using an angular divergence measuring signal. This signal is compared with two predetermined thresholds + xo and - xo. When the probability of the two thresholds being exceeded by the divergence signal is greater than a predetermined value Po, the arrangement generates a logic signal which is used to prevent the tracking circuits of the radar from locking on to the received echo.
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