Performance improvement of magnetic anomaly detector using Karhunen-Loeve expansion
Performance improvement of magnetic anomaly detector using Karhunen-Loeve expansion
复制标题
使用 Karhunen-Loeve 展开改进磁异常探测器的性能
DOI：
10.1049/iet-smt.2016.0392
复制
发表时间：
2017
影响因子：
1.4
通讯作者：
Zhu Xuejun
中科院分区：
文献类型：
--
作者：
Wan Chengbiao;Pan Mengchun;Zhang Qi;Chen Dixiang;Pang Hongfeng;Zhu Xuejun
本文采用Karhunen-Loeve展开对磁异常检测器进行改进，以扩大目标信号被彩色噪声污染时视觉模糊的铁磁目标的检测距离。在该检测器中，利用地磁噪声的自相关函数对正交基函数进行修正，通过匹配滤波进行异常检测。仿真结果表明，与传统检测器相比，改进后的检测器在有色高斯噪声下具有更好的检测性能；特别是当噪声指数较大时，改进效果更为明显。通过实验测量，证明了真实地磁噪声是有色的，服从近似高斯分布。实验表明，在低信噪比的情况下，该检测器的增量检测概率为0.1 ~ 0.2，在实际应用中更具吸引力。
In this work, the authors improve the magnetic anomaly detector by using Karhunen–Loeve expansion, for expanding the detection distance of visually obscured ferromagnetic object when the target signal is contaminated by coloured noise. In the detector, the orthonormal basis functions are modified by the autocorrelation function of geomagnetic noise, and the anomaly is detected by matched filtering. Compared with the traditional detector, simulation results show that the modified detector has better performance with coloured Gaussian noise; especially, the improvement is more evident when the noise exponent is bigger. The real geomagnetic noise is proved to be coloured and obey approximate Gaussian distribution by the measurements in experiment. Tests with this noise indicate that the proposed detector achieves an incremental detection probability of 0.1 – 0.2 in the case of low signal‐to‐noise ratio, which makes it more attractive in practice.