Analysis of Electric Field Interference Characteristics and Signal Detection Method Based on Ocean Buoys

doi:10.12382/bgxb.2021.0671

Abstract

Abstract:

To solve the problems of electric field acquisition and target detection in the deep ocean environment, the interference characteristics of an electric field measured by a deep sea electric field detection buoy are analyzed. It has been confirmed that the energy of buoy shaking interference is primarily below 0.5 Hz and decreases with depth increases. The interference of the electric field can be reduced to 0.1μV/m. Then, to detect the electric field signals of the buoy platform, an improved detection method based on adaptive threshold line spectrum energy sum is proposed, based on the analysis of interference characteristics. Simulation and experimental results show that the proposed improved algorithm can effectively detect the target electric field signals and reduce the false alarm probability while ensuring target detection probability.

Key words: electric field, ocean buoy, interference characteristics, target detection

SUN Qiang, ZHANG Jiawei, YU Peng. Analysis of Electric Field Interference Characteristics and Signal Detection Method Based on Ocean Buoys[J]. Acta Armamentarii, 2023, 44(3): 857-864.

Figures/Tables 14

Fig. 1 Buoy for underwater electric field detection

Fig. 2 Three components and spectrum of the electric field in the diving process

Fig. 3 Buoy attitude in the diving process

Fig. 4 Three components and spectrum of the electric field during floating

Fig. 5 Buoy attitude during floating

Fig. 6 Electric field from floating to diving

Fig.7 Buoy attitude from suspension to dive

Fig. 8 Line spectrum energy detection process

Fig. 9 Self-adaptive threshold line spectrum energy detection process

Fig. 10 Comparison of ROC curves of simulation data

Fig. 11 Comparison of ROC curves of measured data

Fig. 12 Measured low-frequency electric fields of two real ships

Fig. 13 Electric field detection results of a cargo ship

Fig. 14 Electric field detection results of a tanker

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