Current status of LLL four-D atmospheric propagation code effort

The scenario capability of the Four-D code was generalized from the previous coplanar version, which assumed a moving laser platform, a target on a collision course with the platform, and an arbitrarily oriented coplanar wind. The laser was displaced to any height above the platform, and the scenario plane was arbitrarily oriented with respect to the horizon. The scenario routine returned to the hydrodynamics routine of the code a transverse wind velocity vector of varying magnitude and orientation. The hydrodynamics routine of the Four-D code was capable of treating both CW and multipulse steady state sources with winds of arbitrary magnitude and direction relative to the x-axis.