Evaluation of the extremely low-frequency electromagnetic field contribution rate for submarines using the analytic hierarchy process
The extremely low-frequency(ELF)electromagnetic field emitted by submarines serves as a critical feature for target detection.Its complexities arise from various causes,with platform operating conditions and underwater positioning significantly affecting its characteristics.Effectively manipulating these factors to diminish the submarine's magnetic signature is vital for enhancing its magnetic stealth capabilities.However,current research lacks sufficient exploration of the influence degree of these varied causes.To address this gap,a contribution rate assessment method is introduced based on a hierarchical analysis model,aiming to provide a theoretical foundation for such manipulation.The study begins with an in-depth analysis of the threat causes of submarine ELF electromagnetic field,establishing a hierarchical model to encapsulate these threats.Subsequently,simulation techniques are employed to extract the electromagnetic field signal characteristics generated by different causes,leading to the construction of a threat matrix and a feature matrix.Finally,the contribution rates of different causative electromagnetic fields to the total electromagnetic field were calculated.On the sternward measurement line,the wake magnetic field contributes the highest proportion,reaching 0.7649.On the radial measurement line,the shaft-frequency magnetic field has the highest contribution rate,which gradually attenuates and eventually falls below the wake electromagnetic field at 150 meters,maintaining a proportion of approximately 0.5.The simulation results validate the method's effectiveness and set a technical precedent for the development of comprehensive active control strategies for submarine ELF electromagnetic field.
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