Research On Air-water Intermediate Communication Based On Microwave-acoustic System

Prosperous towards the sea,strong towards the sea.The in-depth development and utilization of marine resources are gradually entering people's field of vision.In order to complete the collection and transmission of underwater information,how to achieve cross-border quality transmission of underwater information and air nodes has become a new research topic.The research of this subject will promote ocean development and support underwater units to communicate with targets above the water surface across media.Compared with the traditional method of information transmission,it can open up the transmission of non-intermediary information from underwater to water,which can avoid exposure of underwater targets and save intermediary costs.This paper uses theoretical mathematical modeling and experimental verification to study a new type of cross-medium communication based on microwave and acoustics.This communication method uses an underwater acoustic device to emit acoustic signals to cause perturbations on the water surface.Radar radiation is used to detect and demodulate the perturbations from above the water surface,thereby realizing air-water cross-medium communication.Based on the basic principle of FM continuous wave radar measurement,combined with the basic demodulation process of the communication method used,this paper takes the lead in proposing and establishing the basic model of the radar irradiating the water surface,and setting up the theoretical research model framework.From the perspective of simulation,the feasibility of extracting key frequency point information based on the microwave-acoustic system communication method is verified.On this basis,the influence of the acoustic perturbation amplitude,water surface amplitude and other variables on the key frequency point information extraction is analyzed.In this paper,the key frequency point information extraction of such a new communication method was successfully realized in the laboratory environment,and the conclusions obtained by simulation were verified through actual measurement experiments.In addition,on the basis of existing modeling,the random wave height model is further integrated,which theoretically verifies the feasibility of extracting key frequency point information under sea wave conditions,and explores the influence of sea wind speed on information extraction.Finally,based on laboratory conditions and simulation results,the corresponding underwater emission acoustic signals and appropriate radar operating parameters were designed,and a set of communication system based on the 2FSK communication method was built,which successfully realized the non-intermediate cross-media information transmission,which verified The feasibility of cross-medium communication based on the microwave-acoustic system.The probability of correct symbol transmission can reach 97.55% in the laboratory without water surface interference,and the correct rate of symbol transmission can reach 88.8% when there is interference on the water surface.This completes the preliminary communication of such a new system.Explore and realize.