The characteristics of frequency-time azimuth spectrum estimation by a vector hydrophone in shallow water

• 来源期刊: 声学学报（英文版）
• 年，卷（期）: 2018,（1）
• 页码范围: 1-17
• 页数: 17页
• 语种: 英文

摘要

The mechanism of interaction between the energy flows of the far-field ship noise and the near-field platform is studied,and the characteristics of frequency-time azimuth spectrum is discussed.Based on normal modes theory in acoustic vector fields,the model of the near-field platform is established,and the simulated result is similar to the investigation in shallow water.The frequency-time azimuth spectrum of the energy flow is investigated by the vector hydrophone changes with frequency.The energy flow of the far-field ship noise interacts with the near-field platform,so four kinds of stripes are shown in the frequency-time azimuth spectrum,which is the same with the investigation of sea trial.The estimation of direction of arrival appears inaccuracy,and varies with frequency.The main factor that affects the characteristics of frequency-time azimuth spectrum of resultant energy flow is the difference of sound pressure level.The estimation of the direction of arrival benefits from this when a number of sources exist in shallow water.