Given that is is a modern radar and part of an array, my guess would be deep subsurface 3d spectroscopy using ground penetrating radar technology, similar to wh

Given that is is a modern radar and part of an array, my guess would be deep subsurface 3d spectroscopy using ground penetrating radar technology, similar to what is now used in mining - http://adrokgroup.com/ http://adrokgroup.com/ , then you know where the distribution of elements are down to several miles below the surface, which means you then know where all the nuclear material in the world is and can spot when it moves. Oh and as a bonus, you have a huge edge on mineral rights.