WG-103 Independent Non-Cooperative Surveillance will develop a system agnostic Technical Specification for non-cooperative surveillance sensors – supplemented as necessary with technique (multi/bi-static or mono-static, passive and/or active) or frequency specific aspects (operating spectrum will influence the clutter and target modeling) that may necessitate annexes specific to different high-level sensor types. The Technical Specification will include guidelines to assist ANSPs procuring such Systems.