The Standoff Radiation Detection System – Trimodal Imager (SORDS-TMI) was originally developed for the Domestic Nuclear Detection Office (DNDO) by Raytheon Integrated Defense Systems. PSI has performed hardware reliability and algorithm upgrades that have significantly improved SORDS-TMI detection capability from its original configuration. Implementation of PSI’s Poission Clutter Split (PCS) has greatly extended system range while concurrently reducing false alarm rates.