相干累加与AR滤波相结合的舰船轴频电场信号处理方法

Delayed accumulation combined with AR filtering for naval axial frequency electric field signal processing

针对采用电场传感器阵列测量舰船电场的应用场景,为提升目标轴频电场的信噪比,提出一种相干累加结合自回归(autoregressive,AR)模型滤波的方法对阵列电场信号进行处理。对测量得到的阵列电场信号进行时延补偿后累加,同时对环境电场信号进行AR建模,并利用AR模型参数构造滤波器,以对累加后的信号实施滤波处理。为验证所提方法在低信噪比条件下的有效性,对实测阵列式电场信号进行处理,结果表明,所提方法能够在信噪比为-25.39 dB的条件下有效压制噪声频谱,保留轴频线谱,处理后信噪比提高约21.92 dB。

In order to improve the signal-to-noise ratio of the target axial frequency electric field,a coherent accumulation method combined with AR(autoregressive)model filtering was proposed to process the array electric field signal for the application scenario of using an array of electric field sensors to measure the electric field of a ship.The measured array electric field signal with time delay compensation was accumulated.The ambient electric field signal was AR modeled.By using the parameters of AR model,a filter was constructed to filter the accumulated signal.To verify the effectiveness of the proposed method under low signal-to-noise ratio conditions,the measured array electric field signals were processed.Results show that the proposed method can effectively suppress the noise spectrum and retain the axis frequency line spectrum under the condition of a signal-to-noise ratio of-25.39 dB.After keep the axial frequency line spectrum,the signal-to-noise ratio increased by about 21.92 dB.