载体姿态对海底混响时空相关特性的影响

讨论了载体姿态对海底混响时空相关特性的影响.考虑载体姿态对相关声呐信号发射的影响,推导理论时空相关函数,得到了时空相关特性与载体姿态之间的关系:载体在某一方向上的摇动越大,在该方向上的相关系数下降越快.将理论推导与仿真结果进行比较,发现在海底不存在大尺度起伏、表面粗糙度各向同性的情况下,二者的时空相关函数吻合得较好。实际海底通常具有大尺度起伏和各向异性的粗糙度,时空相关函数的形状不能由载体姿态和海底大尺度起伏完全确定,但海试数据证明了二者的联合影响。此外,讨论了载体姿态对载体垂向速度测量的影响。

The influence of vessel attitude on spatial-temporal correlation of sea-bottom reverberation

The influence of vessel attitude on spatial-temporal correlation of sea-bottom reverberation has been discussed. The theoretical correlation function is deduced in consideration of the attitude of vessel. The relationship of the spatial-temporal correlation and the vessel attitude is obtained: The greater the sway of the vessel on some direction is, the faster the correlation coefficient decreases on the direction. The correlation flmctions of the theoretical derivation and the simulated data agree well when seafloor has no large-scale relief but has isotropic roughness. The actual seafloor usually has large-scale relief and anisotropic roughness. The vessel attitude and the large-scale relief cannot determine the shape of the correlation function, but trial data has proved their combined influence. In addition, the influence of the vessel attitude on the measurement of vertical velocity has been discussed.