公开(公告)号：US4668952A

公开(公告)日：1987-05-26

申请号：US648537

申请日：1984-09-06

申请人： Kazuyoshi Imazeki ,  Seizi Koyama

发明人： Kazuyoshi Imazeki ,  Seizi Koyama

IPC分类号： G01S7/02 ,  G01S7/42

CPC分类号： G01S7/022

摘要： A radar detecting system comprises an antenna for receiving radar signals, a sweep generator for producing a sweep signal over a predetermined range of frequencies and at a predetermined rate and a mixer for mixing the sweep signal with the received radar signal for producing intermediate frequency (IF) signals. A bandpass filter passes only those IF signals within a predetermined frequency band and a detector responds to the IF signals passed by the bandpass filter by producing corresponding output pulses. A control circuit is responsive to a pair of output pulses being produced for each of three successive cycles of the sweep signal and to both the first pulse and the second pulse of each pair of pulses occurring at the same time intervals respectively relative to the corresponding cycle of the sweep signal for producing a warning signal. An alarm circuit comprises a signal strength detector for producing a DC signal having an amplitude which varies in a predetermined fashion in accordance with the level of the received signal and a voltage-to-frequency converter reponsive to the DC signal for producing an alarm signal alternating between a first level and a second level at a frequency which varies in a predetermined fashion in accordance with the amplitude of the DC signal.

摘要翻译： 雷达检测系统包括用于接收雷达信号的天线，用于在预定频率上以预定速率产生扫频信号的扫描发生器，以及用于将扫描信号与所接收的雷达信号混合以产生中频（IF ）信号。 带通滤波器仅通过预定频带内的那些IF信号，并且检测器通过产生相应的输出脉冲来响应由带通滤波器通过的IF信号。 控制电路响应于对扫描信号的三个连续周期中的每一个产生的一对输出脉冲以及相对于相应周期分别以相同时间间隔发生的每对脉冲的第一脉冲和第二脉冲两者产生 用于产生警告信号的扫描信号。 报警电路包括信号强度检测器，用于产生具有根据接收信号的电平以预定方式变化的幅度的DC信号，以及代表DC信号的电压 - 频率转换器，用于产生交替的报警信号 在按照DC信号的幅度以预定方式变化的频率在第一电平和第二电平之间。