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分析了浅海甚低频声场中的垂直双水听器的互谱特性,尤其关注了声场中只存在两阶简正波时声压互谱的有功分量.数值计算表明:当两个水听器的深度布放合理时,声压互谱有功分量的正负号分布与水平距离无关,选择合适的水听器深度布放组合,可以用于水面目标、水下目标的双择判决;声速分布对该方法的使用影响不大,海底存在吸收将影响算法的作用距离,但在有效作用距离内,该算法仍有较好的稳健性.运用Pekeris波导有效深度的概念建立了声压互谱有功分量正负号分布特性的近似理论分析并可预报双水听器合理的布放深度.理论分析揭示了双水听器布放深度之和应等于波导有效深度,并且在有效深度限制的波导范围内,整个声场的声压互谱有功分量的正负号分布被分为三个水平区域.理论分析加深了对浅海低频声场特性的理解,对该算法的实际使用有指导意义.
The cross spectrum characteristics of vertical double hydrophone in shallow sea and very low frequency sound field are analyzed, especially the active component of the sound pressure cross-spectrum with two orders of simple normal wave in the sound field.Numerical calculations show that when the depth of two hydrophone When it is reasonable, the distribution of the sign components of the sound pressure cross-spectrum active components has nothing to do with the horizontal distance, select the appropriate combination of depth hydrophone placement, can be used for the dual decision of the surface targets and underwater targets; Sound velocity distribution of the method The absorption of the seafloor will affect the range of the algorithm, but the algorithm still has good robustness within the effective range.According to the concept of effective depth of Pekeris waveguide, The theoretical analysis reveals that the sum of the deployment depths of the two hydrophone should be equal to the effective depth of the waveguide, and within the effective depth-limited waveguide, the whole The distribution of the sign components of the sound pressure cross-spectrum active components in the sound field is divided into three horizontal regions.Theoretical analysis deepens the understanding of the low-frequency sound field characteristics of the shallow sea and is instructive for the practical use of the algorithm .