GSI has developed both dual mode MMW/IR sensors as well asterminal seekers for mlrs-tgw (martin and Raytheon), sadarm (avco), cgsp (bendix), and other programs over the last few years. We are also presently developing a low cost electronically steered, monopulse strap down seeker for high speed intercepted terminal guidance. This phase I task will investigate the use of a number of different inexpensive terminal seekers utilizing IR, MMW, passive radiometry, Lidar, and various combinations to provide limited detection cap_ ability (small search area) and terminal guidance. The investigation will start with the determination of seeker requirements based on expected trajectories, search areas, approach angles, target characteristics, etc. The investigation will cover scan techniques and waveform characteristics for various type sensors to determine a number of potential terminal guidance schemes. These will be traded using criteria OR performance [cep, pk (if vulnerability available)], volume required, unusual (unbomblike) trajectory requirements, and ultimately seeker cost (in high volume production). GSI will also define a concept validation phase II for the most successful candidate.