Magnetic anomaly detection using entropy filter
Magnetic anomaly detection using entropy filter
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DOI：
10.1088/0957-0233/19/4/045205
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发表时间：
2008-04-01
影响因子：
2.4
通讯作者：
Kaplan, Ben-Zion
中科院分区：
文献类型：
--
作者：
Sheinker, Arie;Salomonski, Nizan;Kaplan, Ben-Zion
我们解决的铁磁目标，产生异常的环境地球磁场的检测。检测隐藏在磁噪声中的异常需要使用磁异常检测器（MAD），例如正交基函数（OBF）检测器。与依赖于目标信号波形集合的OBF检测器相比，我们提出了自适应最小熵检测器（MED）来检测磁噪声模式中的任何变化。因此，我们构造了MED的基础上的磁噪声概率密度函数。MED在真实世界的磁噪声上进行了测试，并与OBF检测器进行了比较。在检测低信噪比的铁磁目标时，MED的检测率高于OBF检测器。MED的OBF检测器的明显优势示出，当目标不移动根据假设的模式。低计算复杂度使得MED适合于真实的时间应用。
We address the detection of a ferromagnetic target that generates an anomaly in the ambient Earth magnetic field. Detection of an anomaly buried in magnetic noise requires the use of a magnetic anomaly detector (MAD), such as the orthonormal basis functions (OBFs) detector. In contrast to the OBFs detector that relies on target signal waveform ensemble, we propose the adaptive minimum entropy detector (MED) to detect any changes in the magnetic noise pattern. Hence, we have constructed the MED based on the magnetic noise probability density function. The MED was tested on real-world magnetic noise and compared to the OBFs detector. Higher detection rate was exemplified for the MED over the OBFs detector in detecting a ferromagnetic target with low signal-to-noise ratio (SNR). Appreciable advantage of the MED over the OBFs detector is shown, when the target does not move according to the assumed pattern. The low-computational complexity makes the MED appropriate for real time applications.