中文摘要：

水下判定海面海浪等级时必须消除运载体自身升沉运动的影响,现有水下判定海面海浪算法主要是基于高通滤波。经运动坐标系中的海浪谱分析,迎浪航行时海浪观测的谱峰频率将向高频变化,有利于从观测数据中分离出运载体垂直运动特征。水下判定海面海浪方向有助于改善高通滤波算法的实用性。通过在水下船舶上构建声学观测阵列,对各阵元观测海浪进行相位变换,建立了相位差法水下判定浪向的解算模型;进行了随机波和规则波两组水槽试验,验证了方法的实用性,有效提高了水下判定海面海浪技术的实用性。

英文摘要：

Acoustic instruments allow underwater vessels to detect the sea states, but the correction to measured data has to be made to compensate the vertical movement of the vessel. Normally used process algorithm for that, basi- cally based on high-pass filter model suffers the difficulty in deciding the cut-off frequency. Spectrum analysis shows that the wave spectrum moves to higher frequencies when the vessel navigates against the waves so as to make sepa- rating vehicle vertical movement easier, which helps the practical use of filtering. In order to measure the direction of the wave, an acoustics array is installed on the vessel, the Hilbert transform is used to analyze wave phases detec ted by every sensor, and a model to estimate wave direction based on phase difference is constructed. Experiments in water flume are conducted to validate the model under the condition of regular waves and random waves. Results show that the model is effective in iudging wave direction so as to improve the precision of estimating sea states.