In this paper, an improved positioning algorithm is proposed for a long-range asymmetric perimeter security system. This algorithm employs zero-crossing rate to detect the disturbance starting point, and then utilizes an improved empirical mode decomposition to obtain the effective time-frequency distribution of the extracted signal. In the end, a cross-correlation is used to estimate the time delay of the effective extracted signal. The scheme is also verified and analyzed experimentally. The field test results demonstrate that the proposed scheme can achieve a detection of 96.60% of positioning errors distributed within the range of 0-±20 m at the sensing length of 75 km, which significantly improves the positioning accuracy for the long-range asymmetric fence perimeter application.ud
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机译：本文针对远程非对称周界安全系统，提出了一种改进的定位算法。该算法利用过零率检测干扰的起始点，然后利用改进的经验模态分解获得提取信号的有效时频分布。最后，使用互相关来估计有效提取信号的时间延迟。该方案也得到了验证和实验分析。现场测试结果表明，该方案在检测距离为75 km时，可以检测到0-±20 m范围内分布的定位误差的96.60％，大大提高了远程非对称围栏的定位精度外围应用程序。 ud
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