| 摘 要： | In this paper the properties of space-time correlation function of the noise field of moving source inlayered statistic inhomogeneous medium are studied and the effects of random fluctuating boundary are con-sidered as well.It has been shown,theoretically and experimentally,multi-path propergating effects cause thedispersion of the correlation function and fluctuations of the medium refraction index and the boundarycause the fluctuation of it.The effect of the movement of the noise source on the output of real-time correlator is equivalent to alow-pass filter added the drift of space-time correlation function.These properties of the correlation function cause grave degradation of the signal processing gain ofnoise ranging sonar system.The fluctuating and the distortion of conrrelation function made it difficult to realize the noiseranging.So in this paper,a method of space correlation ranging by a linear array of four points with shortseparation and long span and a technigue of dual-correlation signal p
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