Analysis of Interference Characteristics of Electric Field Detection on Moving Platform

doi:10.12382/bgxb.2024.0992

Abstract

Abstract:

To verify the feasibility of equipping electric field sensors on fast motion platforms to detect ship targets, this manuscript analyzes the mechanism of background electric field generation on fast motion platforms, builds a high-speed motion platform electric field detection system based on surface speedboats, and conducts real boat sea measurement experiments. The background electric field of speedboats at different positions, engine operating conditions, and sailing speeds is measured, and the measurement results are analyzed. By analyzing the experimental data at sea, it is found that the background electric field comes from: 1) the motion induced electric field of the speedboat platform, 2) the corrosion and electromagnetic radiation of the speedboat itself. The background electric field has high energy in the frequency band below 1Hz (static electric field), so the ship’s electrostatic field is not suitable as a detection signal source. When the speed is below 20 knots, the background electric field spectral density of the speedboat detection platform in the 1-30Hz frequency band is about 0.4μV/$\sqrt{\mathrm{Hz}}$, so the ship’s shaft frequency electric field can be used as the target signal source. To verify the feasibility of electric field detection on the speedboat platform, electric field targets of 100A·m were detected at different speeds of 5~15kn, with a detection distance of 1500m. Therefore, it is practical to use a fast motion platform equipped with electric field sensors to detect the ship’s electric field.

Key words: moving platform, electric field detection, interference electric field, shaft-rate electric field

CLC Number:

TJ610

ZHANG Jiawei, XIE Taotao, XIAO Dawei. Analysis of Interference Characteristics of Electric Field Detection on Moving Platform[J]. Acta Armamentarii, 2025, 46(5): 240992-.

Figures/Tables 12

Fig.1 Schematic diagram of electric field measurement sensor

Fig.2 Schematic diagram of boat and sensor installation

Fig.3 Background electric filed when the boat engine is off

Fig.4 Background electric filed when the boat engine is on

Fig.5 Amplitude spectrum of noise at different speeds(DC-30Hz)

Fig.6 Amplitude spectrum of noise at different speeds(1~30Hz)

Fig.7 The electric field at different speeds (bow)

Fig.8 The electric field at different speeds (stern)

Table 1 Peak to peak value of background interference electric field at different speeds

航速/kn	电场峰峰值/(μV·m^-1)
航速/kn	Ex₁	Ey₁	Ex₂	Ey₂
5	14.9	26.4	320.9	917.5
10	16.1	15.3	50.7	130.0
15	33.6	25.4	52.6	132.9
20	38.0	129.9	61.6	236.8
25	2634.7	641.2	85.8	152.2

Fig.9 Detection effect at a speed of 5kn

Fig.10 Detection effect at a speed of 10kn

Fig.11 Detection effect at a speed of 15kn

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