Velocity Independent Vector Information System (VIVIS).
Brown,Lawrence J., Schriner,David A., David E. Troyer · Defense Technical Information Center (DTIC) · 1975
The technical and operational characteristics of the Velocity Independent Information System (VIVIS) are presented. VIVIS is a time-of-arrival (TOA) scoring system that determines the vector position of various types of air-to-ground and ground-to-ground projectiles as they pass through the zone of influence of the target; e.g., a seaborne powered target (SEPTAR) boat.