A review of research on traceability and positioning of marine rescue

In ship capsize emergency rescue, time is life, and traceability and identification are the keys to winning rescue time. Through the research on the detection and identification method of traceability information, the physical connotation of the signal can be identified at the first time, the air pressure, draft and remaining buoyancy of the submerged cabin can be detected, and the call for help and traceability can be heard. Combined with relevant research at home and abroad, it focuses on four aspects: traceable signal propagation mechanism, cavity hydroelastic modal analysis, multi-parameter signal identification, and black-box traceable passive positioning, using the integrated empirical modal analysis of traceable mixed signals and blind source separation. technique, Analytical Modal Characteristics. Use the cepstrum to identify the modal signal, establish the mapping relationship between the water pressure, draught, residual buoyancy and modal characteristics of the cabin, analyze the excitation, transmission and response mechanism of the propagation characteristics of the traceable signal of the submerged cabin, and use artificial nerves. The network method avoids the difficulty of detection and identification of the traceability black box, and realizes the detection of rescue information of overturned ships. Reconstructing the rescue call sound through artificial intelligence and using the reconstructed time domain signal for passive passive positioning of the call for help, filtering the noise of the monitoring sound, avoiding the blindness, physical exertion and risk of diving and exploration, and improving the rescue efficiency.