周界入侵检测系统宽带滤波器的设计及优化
发布时间：2019-02-14 07:24
【摘要】：针对传统m推演型滤波器插入损耗大、带内平坦度不理想等问题,提出了一种改进型带通滤波器设计优化方法。本文首先介绍了滤波器各子级的设计方法,利用ADS对滤波器参数进行迭代优化设计,并采用PCB工艺制备了带通滤波器样品同时进行了传输特性的测量,最后将其实际应用于泄漏电缆周界入侵检测系统中提高了硬件前端的信噪比。测量结果表明,在25.75~36.25 MHz的通带范围内,插入损耗小于1.5 d B,带内平坦度优于0.5d B,反射系数小于-15 d B,过渡带性能理想;在陷波点20 MHz、45 MHz处衰减大于-50 d B。在本文的最后,对周界入侵检测系统漏报率、误报率、正确率进行了初步测试,结果表明虚警率从每小时1次减少至2天内未发生报警,该滤波器结构有效地解决了系统虚警率高的问题,提高了系统的稳定性。
[Abstract]:Aiming at the problems of large insertion loss and unsatisfactory in-band flatness of the traditional m-derived filter, an improved design optimization method of bandpass filter is proposed. In this paper, the design method of each sub-level of filter is introduced, the parameters of filter are optimized iteratively by ADS, and the sample of bandpass filter is prepared by PCB process, and the transmission characteristic is measured at the same time. Finally, it is applied to the leakage cable perimeter intrusion detection system to improve the signal-to-noise ratio of the hardware front end. The results show that the insertion loss is less than 1.5 dB, the in-band flatness is better than 0.5 dB, and the reflection coefficient is less than -15 dB in the range of 25.75 ~ 36.25 MHz. At the notch point of 20 MHz,45 MHz, the attenuation is greater than -50 dB. At the end of this paper, the false alarm rate, false alarm rate and false alarm rate are reduced from once an hour to 2 days. The filter structure can effectively solve the problem of high false alarm rate and improve the stability of the system.
【作者单位】： 宁波大学信息科学与工程学院;
【基金】：国家自然科学基金(61571251,61501272) 浙江省公益技术应用研究项目(2015C34004) 宁波市自然科学基金(2016A610064)
【分类号】：TN713
本文编号：2421970
[Abstract]:Aiming at the problems of large insertion loss and unsatisfactory in-band flatness of the traditional m-derived filter, an improved design optimization method of bandpass filter is proposed. In this paper, the design method of each sub-level of filter is introduced, the parameters of filter are optimized iteratively by ADS, and the sample of bandpass filter is prepared by PCB process, and the transmission characteristic is measured at the same time. Finally, it is applied to the leakage cable perimeter intrusion detection system to improve the signal-to-noise ratio of the hardware front end. The results show that the insertion loss is less than 1.5 dB, the in-band flatness is better than 0.5 dB, and the reflection coefficient is less than -15 dB in the range of 25.75 ~ 36.25 MHz. At the notch point of 20 MHz,45 MHz, the attenuation is greater than -50 dB. At the end of this paper, the false alarm rate, false alarm rate and false alarm rate are reduced from once an hour to 2 days. The filter structure can effectively solve the problem of high false alarm rate and improve the stability of the system.
【作者单位】： 宁波大学信息科学与工程学院;
【基金】：国家自然科学基金(61571251,61501272) 浙江省公益技术应用研究项目(2015C34004) 宁波市自然科学基金(2016A610064)
【分类号】：TN713
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1 李晶皎;许哲万;王爱侠;陈勇;;高速包分类平台的FPGA设计[J];东北大学学报(自然科学版);2012年08期
，本文编号：2421970
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