A Fast Fitting Model of Submarine Target Strength Forecast Result for Torpedo Guidance System

Mathematical model for torpedo guidance computation ought to be fast and accurate due to the limited hardware of guidance system and the fast attack process. Based on block element method, the target strengths of a submarine in dif-ferent frequencies and azimuths are forecast precisely in this paper. Firstly, the curves of azimuth angle and target strength in single frequency are fitted by using the least squares method. Then, Lagrangian interpolation is applied to the curves taking frequency as the variable to obtain a fast fitting model of submarine target strength forecast result with variables of frequency and horizontal azimuth, which can meet the real-time computation for torpedo guidance system. Simulation re-sults show that this method has higher computation speed and precision than existing equivalent scattering area formula and ellipsoid correction model.