EMSI has its roots in Air-to-Air and Ground-to-Air Inverse Synthetic Aperture Radar (ISAR) imaging of aircraft in flight. EMSI fully automated a previously human operator intensive process through use of fast, innovative template matching algorithms. Automation was challenging due to the highly ambiguous ISAR waveform, the requirement to adaptively motion compensate for the unknown target aircraft motion, the requirement to accurately deduce the unknown crossrange scale, and the need to accurately register a wireframe target overlay. The software was exhaustively tested and achieved TRL 9 under routine Air Force special programs operations during the early 2000s and is still in routine use by the US Air Force. EMSI has subsequently applied this technology to make focused 2D ISAR imagery of moving ground vehicles, small boats, and ships.
Inverse Synthetic Aperture Radar (ISAR) Imaging of Aircraft in Flight June 13, 2022