关键词：磁场干扰；方向谱；磁异常探测；功率谱密度
摘 要：Ocean wave have a magnetic field disturbance,caused by the motional induction of sea water moving in the steady main field of Earth.Mass experiment indicates ocean wave-generated magnetic field disturbance can be a major limitation on the performance of airborne magnetic anomaly detection.To check the character of such disturbance observed above sea-surface,a harmonic ocean wave-generated magnetic field disturbance mathematical model based on Weaver's monochromatic wave-generated magnetic field model and ocean wave directional spectrum is proposed.Algorithm is presented for real-time simulation of ocean wave-generated magnetic field disturbance corresponding to the proposed mathematical model.Numerical simulations of ocean wave-generated magnetic field disturbance are sampled above sea-surface by a stationary magnetometer and an airborne magnetometer moving steadily along a rectilinear path.Spectrum analysis of the samples is performed.Simulations results indicate that the proposed harmonic ocean wave magnetic field disturbance mathematical model can well-simulate the real sea conditions.Numerical simulations also reveal that there is a Doppler frequency shift with the increase of magnetometer flight speed.Moreover,energy of the magnetic field disturbance is more dispersed and frequency band is wider with the increase of magnetometer flight speed.