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介绍一种基于ARM的泄漏电缆电场畸变入侵探测器接收机系统的设计,采用ARM7微控制器芯片作为主控单元,通过对前端电路采集来的信号进行快速傅立叶变换算法处理,达到较准确的入侵检测的目的。前端电路是经由两条平行泄漏电缆,接收并检测因入侵而产生的空间电磁场分布变化信号:场强在1μV/m～250μV/m范围内,波动频率为0.07Hz～8Hz的干扰。通过将接该高频小信号放大,送入同步正交检波电路,ARM进行FFT计算后,根据波动范围与预定阈值比较结果,判断是否发出报警信号。实际测试结果表明,该系统能有效应用于户外无人监测系统的入侵探测领域,抗干扰能力强,有效监测非法入侵信号,并及时达到报警的功能。
This paper introduces the design of a leaky cable electric field distortion intrusion detector receiver system based on ARM. The ARM7 microcontroller chip is used as the master control unit. The signals collected by the front-end circuit are processed by Fast Fourier Transform algorithm to achieve a more accurate invasion The purpose of testing. The front-end circuit receives and detects the spatial electromagnetic field distribution change signal generated by the invasion through two parallel leakage cables: the field strength is in the range of 1μV / m ~ 250μV / m and the fluctuation frequency is 0.07Hz~8Hz. By amplifying the small high-frequency signal into a synchronous quadrature detection circuit, the ARM performs FFT calculation to determine whether to send an alarm signal according to a comparison between the fluctuation range and a predetermined threshold. The actual test results show that this system can be effectively used in the field of intrusion detection of unmanned outdoor surveillance systems, and has strong anti-interference ability, effectively monitoring illegal intrusion signals and timely alarm function.