A method and apparatus for computing a convolution between an input GPS signal and a CA code reference by generating the convolution result in real time without storing unprocessed signal samples. The gas generator further comprises a pyrotechnical propellant charge that is provided for opening the membrane and is accommodated in a preferably bushing-shaped propellant charge housing. The other frame member of the frame is adapted to secure the frame assembly to a harness of an animal such as a horse. The floor cleaning machine also has a pair of slit orifices that eject fan spray patterns of cleaning liquid that are non-coplanar and do not intersect each other.