Abstract: The present application describes an apparatus that includes a radar antenna device to acquire synthetic aperture radar data, radar receiver and transmitter equipment coupled to the radar antenna device, and a synthetic aperture radar processing device in communication with the radar receiver and transmitter equipment. This processing device includes a processor structured to process the synthetic aperture radar data, which is representative of a defocused image. The processor is further structured to define an image processing constraint corresponding to an image region expected to have a low radar return and generate one or more output signals as a function of the image processing constraint and the data. The one or more output signals are representative of a more focused form of the defocused image.

Abstract: In a turbine or compressor blade and supporting disk assembly in which the assembly is by tangential positioning of the blades, the cooperating blade root and groove in the disk have base surfaces that are held in spaced relation to each other by a rib on the blade root extending toward the base surface of the groove and into contact with it.