Abstract: In an airborne armament fire control prediction computer, apparatus for computing smoothed inertial velocity and acceleration components of an observed target in a three-dimensional Cartesian coordinate system. A target tracking sensor mechanization is provided which generates target position, velocity, and acceleration data components in an inertially-stabilized Cartesian coordinate system, whereby improved closed-loop pilot-aircraft weapon control system dynamic stability and accuracy result. Target sensor dynamic tracking accuracy improvement and noise reduction are also obtained by virtue of such inertially stabilized tracking mechanization.