Modeling and analysis of passive sonar working background under directional interference

Passive sonar equation can be used to forecast sonar range. The working background is usually supposed to be isotropic noise. However, directional interference often exists in real application, where the application of classic passive sonar equation is limited. Based on the classic passive sonar equation, the influence of directional interference on the passive sonar working background is discussed, and a more useful working background model for passive sonar under directional interference is presented with the detailed analysis of the working background model in beam domain. The passive sonar equation is modified according to this model, and then it can be used to forecast sonar range under directional interference. Finally, the correctness of the working background model in beam domain is validated by simulation in different interference to noise ratios. The presented model can provide an important reference for acoustic compatible analysis and performance prediction of passive sonar under directional interference.