Intensity fluctuation correlation interferometry, a phase independent synthetic aperture technique invented by radio/optical astronomers Hanbury-Brown and Twiss in 1957, is proposed as the basis of a new family of space-based sensors of extremely high angular resolution for SDIO applications to detection of launchers or lasers. Two novel implementations for satellite basing are proposed, a fiber-optic implementation with baselines up to 1 km and an independent moving dector implementation with much longer baselines. Angular resolutions from 10exp(-9) to 10exp(-13) radians may be possible. Applications are discussed to the surveillance, discrimination, tracking, pointing and beam-steering missions.
