The process by which the scientific instrumentation (sensors, detectors, etc.) and necessary mechanical and electronic subassemblies are assembled into a complete operational package capable of achieving the scientific objectives of the mission.
PAYLOAD BUILD-UP (MISSILE AND SPACE)
Meaning of PAYLOAD BUILD-UP (MISSILE AND SPACE) in English
DOD English dictionary of military terms. Английский словарь военных терминов DOD. 2012