A universal model with arithmetic of two turn angle shooting for predetermined encountering state

For solving the problem of calculating two turn angle shooting parameter with predetermined encountering state, by considering with possible process of special trajectory and shifting torpedo velocity, a universal model which satisfied the requirement of different shooting mode was constructed, and a formulas concerning Newton iteration arithmetic was given. The correctness of the model and arithmetic was validated by numerical experiment; some conclusion indicated that the model and arithmetic could satisfy the requirements to calculate shooting parameter for straightforward, sound auto-guiding, wake-homing, salvo and target selection, etc.