Journal
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
Volume 19, Issue -, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LGRS.2021.3071133
Keywords
Perpendicular magnetic anisotropy; Magnetoacoustic effects; Magnetic domains; Signal to noise ratio; Magnetic separation; Noise measurement; Magnetic moments; Magnetic anomaly detection (MAD); noise spatial characteristics; noise suppression
Categories
Funding
- Natural Science Foundation of Heilongjiang Province of China [LH2019E040]
- Stable Supporting Fund of Acoustic Science and Technology Laboratory [JCKYS2020604SSJS006, JCKYS2020604SSJS005]
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This method suppresses noise in vector magnetic anomaly detection by analyzing noise spatial characteristics and finding a projection direction with minimum fluctuations for the projected noise. By processing the projected signal with a vector orthogonal basis functions (OBFs) detector, a 3 dB higher signal to noise ratio (SNR) is achieved compared to traditional OBFs filters, effectively suppressing low-frequency noise and obtaining weak target signals.
This letter reports a noise suppression method for vector magnetic anomaly detection (MAD) based on noise spatial characteristics analysis. The environment noise indicates space anisotropy that is essential for noise depression. To find a projection direction e that allows the projected noise, denoted as Ne = e center dot N, to have minimum fluctuations, we compute the standard deviation sigma of N_e. The projected signal is then processed by a vector orthogonal basis functions (OBFs) detector resulting in a higher signal to noise ratio (SNR) by 3 dB than the traditional OBFs filter. After noise space transformation (NST) processing, the compelling low-frequency noise is suppressed and the weak target signal can be obtained.
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