Experimental results of time-frequency domain characters for divers with open-circuit SCUBA

In this paper, we studied the time-frequency domain characters of divers in lake trail and proposed some experimental results. The diver we invited in the trail was equipped with open-circuit SCUBA. We recorded the breathing sound of the diver in different motion state and analyzed its characters both in time and frequency domain. We extracted some key characteristics and practical parameters for the diver detection and identification. The results we obtained from the trail support the passive diver detection.