Deep Space Surveillance System Five
Deep Space Surveillance System Five was a signals detection and decryption package developed by the Terran Confederation during the Terran-Kilrathi War. It was the detection equipment, analysis software which could sort through millions of signals, crack codes, figure out which ones have certain things we're looking for and then give the operators a hard copy to intelligence officers.
The design was started in 2648. Originally the antenna nets were twenty miles across, took five hundred personnel to operate it, and required a ship larger than a carrier to operate from.
D 3S 5 had a fifty meter antenna and could be installed on the flight deck of an escort carrier.
Its most famous use was during the Free Corps mission in 2668 when it detected signals to and from Hari space that lead the human forces to the Hakaga fleet.