基于1.5维谱的船舶轴频电场信号实时检测

为有效地从海洋环境电场中检测出船舶轴频电场信号,在采用正态概率图法分析海洋环境电场高斯性的基础上,利用1.5维谱在抑制高斯噪声和加强谐波信号基频分量等方面的优势,提取特征频段(1～7Hz)范围内的1.5维谱的平均值为特征值,利用滑动检测方法对信号进行了实时检测,并通过实测数据对该检测算法进行验证。结果表明:该方法在信噪比较高和较低的情况下均能较好地实时检测到目标信号,并且在没有目标信号的情况下不会出现虚警。

Real-time detection of ship shaft-rate electric field signal based on 1.5-dimension spectrum

In order to effectively detect the ship shaft-rate electric field signals from the ocean environmental electric field,a real-time detection method based on 1.5-dimension spectrum was proposed.Firstly,the gaussianity of ocean environmental electric field was proved by use of normal probability plot.Then,the average value of 1.5-dimension spectrum with characteristic spectra of 1~7 Hz was extracted as eigenvalue by taking advantage of the 1.5-dimension spectrum to suppress the gaussian noise and enhance the fundamentality of harmonic signal.The real-time detection of shaft-rate signal was carried out with a sliding detection method.Finally,the measured data was used to verify the effectiveness of the method.The result shows that the method can detect the target signal effectively both in high and low SNR conditions and that a wrong alarm does not happen when there is no target signal.