Underwater ambient noise analysis on dongshan offshore

For setting the optimal transmitting power in underwater acoustic networks (UWAN), we need to measure the underwater ambient noise on different receiving stations so that we can get the better signal-to-noise (SNR), and make better use of the transmitting energy. We use hydrophone array to measure the underwater ambient noise, and analyze the power spectrum density (PSD) of noise with different frequencies to present the variability and complexity of the underwater ambient noise. The result shows that the PSD fluctuation of noise with frequency below 10 kHz is large but it is steady when the frequency is larger than 10 kHz. This can help us to set the proper transmitting power before deploying the UWAN.