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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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公开(公告)号：US3979752A
公开(公告)日：1976-09-07
申请号：US595083
申请日：1975-07-11
申请人： Jean-Claude Charlot
发明人： Jean-Claude Charlot
CPC分类号： G01S13/24
摘要： A radar system emitting a recurrent sequence of n equispaced bursts of carrier frequency, varying from one burst to the next, has a transmitter including a carrier-frequency generator with a frequency-varying motor driven by a synchronizing circuit to produce a repetitive frequency pattern recurring a whole number of times in a program cycle of n pulse periods. An associated receiver includes a local oscillator whose frequency is incremented, from one pulse period to the next, by a feedback circuit comprising a modulator with inputs connected to the output of this oscillator and to a coupler picking up the instantaneous carrier frequency from the transmitter output; this modulator works into a frequency discriminator, tuned to a predetermined intermediate frequency, returning an error signal to a control input of the oscillator via a multiple integrator concurrently storing all the error signals for the several pulse periods; an adder superposes these error signals upon a monitoring signal extracted at the beginning of each pulse period from the carrier-frequency generator. The multiple integrator includes an operational amplifier with n parallel capacitors in respective feedback paths which are normally open-circuited and are sequentially connected in circuit under the control of a shift register restarted at the beginning of each program cycle. A similar multiple integrator may be inserted in an automatic-gain-control circuit for an intermediate-frequency amplifier in the output of a mixer which heterodynes the received echoes with the local-oscillator output.
摘要翻译： 发射载波频率的n个等间隔突发的复现序列的雷达系统从一个脉冲串变化到下一个脉冲串具有发射机，其包括具有由同步电路驱动的频率变化的电动机的载波频率发生器，以产生重复的频率模式 在n个脉冲周期的程序周期中的整数次。 相关联的接收机包括本地振荡器，其频率从一个脉冲周期递增到下一个脉冲周期，该反馈电路包括具有连接到该振荡器的输出的输入端的调制器以及从发送器输出端拾取瞬时载波频率的耦合器 ; 该调制器工作成频率鉴相器，调谐到预定的中频，经由多个积分器将误差信号返回到振荡器的控制输入端，同时存储多个脉冲周期的所有误差信号; 加法器将这些误差信号叠加在从载波频率发生器开始的每个脉冲周期提取的监视信号上。 多重积分器包括一个运算放大器，它们在各自的反馈路径中具有n个并联电容器，这些电容器通常是开路的，并且在每个程序循环开始时重新启动的移位寄存器的控制下顺序地连接在电路中。 类似的多积分器可以被插入到混频器的输出中的中频放大器的自动增益控制电路中，该混频器的输出与本地振荡器的输出差分接收的回波。
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公开(公告)号：US4020292A
公开(公告)日：1977-04-26
申请号：US637469
申请日：1975-12-03
CPC分类号： G01S13/28
摘要： A band-compressor devices designed to match to one another two systems having different pass bands, comprises means for coding input signals in the form of N digital signals corresponding, at any instant, to the amplitude of the input signal with respect to N quantizing levels. N bistable trigger stages of RS or JK type, followed by as many D-type bistable stages, are provided to receive said digital signals on the one hand and pulses furnished by a clock on the other. The output signals from the bistable stages of type D are then recombined in an adder in order to furnish analog signals or in a coder for furnishing signals in binary form.
摘要翻译： 设计成彼此匹配的具有不同通带的两个系统的带式压缩机装置包括用于将N个数字信号的形式的输入信号编码为相对于N个量化电平在任何时刻对应于输入信号的幅度的装置 。 提供RS或JK型的N个双稳态触发级，随后是多个D型双稳态级，一方面接收所述数字信号，另一方面由时钟提供脉冲。 然后，来自D型双稳态级的输出信号在加法器中重组，以便提供模拟信号或在编码器中提供二进制形式的信号。
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