为了对船舶极低频电场信号的特性进行深入研究，利用所研制的低噪声测量系统对某海域的船舶电场信号进行了测量。在测量结果的基础上对其信号特征进行了分析，分析结果表明：中型船舶的极低频电场信号在近场可达上百微伏每米的量级，且轴频电场信号为谐波信号，在频域上表现为线谱信号，其基频为螺旋桨转动频率，因此该信号可被应用于远程探测。海上试验结果表明：所研制的测量系统利用轴频电场可以探测到2 km外的目标信号。%All vessels ,w hole hulls are built of steel or other materials ,are the sources of an electric field in the seawater .In order to study the characteristics of a ship′s extremely low frequency electri-cal field ,the low noise measuring system is used to measure the signals generated by the electrical field of the ship in a certain sea area .On this basis ,the signal characteristics are analyzed .The results show that the extremely low frequency electrical field signal is an important characteristic ,that the shaft-related ELFE field is a harmonic and that its frequency is in accord with the propeller rotating frequency .The signal can be used for remote detection .The maritime tests verify that the developed measuring system can detect the target signal two kilometers away by use of the shaft-related ELFE .
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