The Study of Ocean Ambient Noise Reconstruction in Low and Medium Frequency Bands

3rd International Conference on Automation, Control and Robotics Engineering

工业技术;计算机科学;无线电电子学

Liang, Zhang^1 ; Fengdan, Wen^1 ; Chunxia, Meng^1 ; Jing, Han^1

Science and Technology on Underwater Test and Control Laboratory, Dalian

116013, China^1

关键词: Continuous observation;    Gaussian white noise;    Ocean ambient noise;    Sound pressure level;    Specific frequencies;    Stationary random process;    Statistic characteristics;    Underwater acoustic signal;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/428/1/012019/pdf
DOI  :  10.1088/1757-899X/428/1/012019

来源: IOP

【 摘 要 】

Ocean ambient noise is the general background of the sea, the sources of which is highly variable, the generated noise signal is random, it changes with time and space. It is usually considered that ocean ambient noise is a special random process with certain power spectrum, so the broadband stationary random process can be used for fitting the continuous spectral noise. This paper carried out statistical analysis on sample data obtained by continuous observation in one day, and then the statistic characteristics of ambient noise frequency spectrum in low and medium frequency bands can be calculated. Generating filter with specific frequency response based on the probability density function of sound pressure level in each frequency randomly, and ocean ambient noise is reconstructed effectively by Gaussian white noise passing the filter above. The simulation results have important implication for low and medium frequency underwater acoustic signal analysis in lab conditions, and it is helpful to test the performance of platform in the oceanic background.