Correlation of Low-Frequency Line Spectrum Characteristics of Underwater Typical Physical Fields of Ships
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摘要: 为了研究水下典型物理场低频线谱的特征和相关性, 首先研制了集声场、电场、磁场和压力场测量功能于一体的水下联合测量装置; 其次在某海域完成了海上试验, 获取了30余艘不同目标的水下物理场信号; 最后基于实测数据分析了典型船舶声场、电场、磁场、压力场100 Hz以下频段低频线谱特征的相关性。分析结果表明: 低频压力信号与低频声场的线谱特征具有强相关和共源特性; 低频声场、压力场的线谱与低频电场信号的线谱在部分频点存在相关性和共源性, 这为基于水下物理场联合探测与识别目标提供了新的思路。Abstract: To study the correlation of low-frequency line spectrum characteristics of underwater typical physical fields, an underwater joint measuring device was developed, which integrated the measurement functions of acoustic field, electric field, magnetic field, and pressure field. Secondly, the underwater physical field signals of more than 30 ships with different targets were obtained through tests in a sea area. Finally, based on the measured data, the correlation between the low-frequency (below 100 Hz) line spectrum characteristics of the acoustic field, electric field, magnetic field, and pressure field of typical ships was analyzed. The results show that the line spectrum characteristics of low-frequency pressure signal and low-frequency electric field are strongly correlated and have common sources. The line spectra of the low-frequency acoustic field, pressure field, and low-frequency electric field signal are correlated and have common sources at some frequency points, which provides a new idea for the joint detection and identification of targets based on underwater physical fields.
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Key words:
- ship /
- acoustic field /
- electric field /
- magnetic field /
- pressure field /
- line spectrum
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图 1 水下声场、电场、磁场和水压场联合测量装置
Figure 1. Underwater joint measuring device of acoustic field, electric field, magnetic field, and water pressure field
图 4 船舶A低频电场与低频磁场的振幅谱
Figure 4. Amplitude spectra of low-frequency electric field and magnetic field of Ship A
图 5 船舶A声场、压力场及电场信号振幅谱
Figure 5. Amplitude spectra of acoustic field, pressure field, and electric field signals of Ship A
图 6 船舶B声场、压力场和电场信号振幅谱
Figure 6. Amplitude spectra of acoustic field, pressure field, and electric field signals of Ship B
图 7 典型目标声场、压力场和电场信号的振幅谱
Figure 7. Amplitude spectra of acoustic field, pressure field, and electric field signals of typical targets
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