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公开(公告)号:EP0416745A3
公开(公告)日:1992-05-20
申请号:EP90308556.1
申请日:1990-08-03
申请人: GEC-MARCONI LIMITED
CPC分类号: G01S13/04 , G01S13/342
摘要: A range-sensitive intruder alarm system using FMCW radar. A sinusoidal FMCW signal (14) is generated (11) and mixed (20) with reflected signals (17) to produce an output signal (21) comprising a series of frequency components (f m , 2f m , etc.) which correspond to sidebands of the FMCW signal (14). Each frequency component has a unique amplitude variation with the range of the source of the return signal (17). Selected frequency components (2f m ,5f m ) are filtered (23,24) and their amplitudes compared (28) to define a range limit of the system. The alarm (30,31) is triggered by the output (E) of a threshold circuit (27) which monitors the amplitude of one of the frequency components (2f m ). Triggering of the alarm is inhibited (F) if the comparison (28) reveals a disturbance occurring outside the defined range limit.
摘要翻译: 使用FMCW雷达的射程敏感入侵者报警系统。 产生正弦FMCW信号(14)并与反射信号(17)混合(20),以产生包括一系列频率分量(fm,2fm等)的输出信号,该频率分量对应于 FMCW信号(14)。 每个频率分量具有唯一的幅度变化与返回信号(17)的源的范围。 所选频率分量(2fm,5fm)被滤波(23,24),并且它们的振幅比较(28)以定义系统的范围限制。 报警器(30,31)由阈值电路(27)的输出(E)触发,阈值电路监视频率分量(2fm)之一的振幅。 如果比较(28)显示超出限定范围的干扰,则触发报警被禁止(F)。
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公开(公告)号:EP0416745A2
公开(公告)日:1991-03-13
申请号:EP90308556.1
申请日:1990-08-03
申请人: GEC-MARCONI LIMITED
CPC分类号: G01S13/04 , G01S13/342
摘要: A range-sensitive intruder alarm system using FMCW radar. A sinusoidal FMCW signal (14) is generated (11) and mixed (20) with reflected signals (17) to produce an output signal (21) comprising a series of frequency components (f m , 2f m , etc.) which correspond to sidebands of the FMCW signal (14). Each frequency component has a unique amplitude variation with the range of the source of the return signal (17). Selected frequency components (2f m ,5f m ) are filtered (23,24) and their amplitudes compared (28) to define a range limit of the system. The alarm (30,31) is triggered by the output (E) of a threshold circuit (27) which monitors the amplitude of one of the frequency components (2f m ). Triggering of the alarm is inhibited (F) if the comparison (28) reveals a disturbance occurring outside the defined range limit.
摘要翻译: 使用FMCW雷达的射程敏感入侵者报警系统。 产生正弦FMCW信号(14)并与反射信号(17)混合(20),以产生包括一系列频率分量(fm,2fm等)的输出信号,该频率分量对应于 FMCW信号(14)。 每个频率分量具有唯一的幅度变化与返回信号(17)的源的范围。 所选频率分量(2fm,5fm)被滤波(23,24),并且它们的振幅比较(28)以定义系统的范围限制。 报警器(30,31)由阈值电路(27)的输出(E)触发,阈值电路监视频率分量(2fm)之一的振幅。 如果比较(28)显示超出限定范围的干扰,则触发报警被禁止(F)。
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