Model and experiments for bistatic scattering strength of underwater objects

Model of bistatic scattering strength of underwater object in the far field is set up by Kirchhoff approximation. Monostatic target strength (TS) of Generic BeTSSi-submarine versus azimuthal angles are calculated by the proposed method at 1 kHz, 4 kHz and 8 kHz, which agree well with the international well-known data, and the computational accuracy is enhanced with the increment of acoustic frequency, and the proposed model is also useful even if the frequency is lower to 1 kHz. Bistatic scattering strength of Generic BeTSSi-submarine and the steady state echo waves from CW and LFM signals are predicted, which show agreement with experimental results, and demonstrate that the proposed model can be used to predict the bistatic scattering strength of large underwater objects.