The impulse characteristic calculation method for transient diffraction problem on the smooth convex ideally conducting object in the bistatic case is developed. The physical optics approach, which is modified by means of the exception of the "terminator breaks" provoked by the inadequacy of the surface current description near the "light-shadow" boundary, is used. Calculated formulae and bistatic impulse characteristic numerical calculation results for the ideally conducting triaxial ellipsoid are given.