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  The primary spacecraft structure containing power, temperature control, and directional thrusters of the satellite that provides locations for the payloads.
NIST IR 8401 from NASA/TP-20210021263
NIST IR 8441 from NASA/TP-20210021263

  The infrastructure of a space platform typically consisting of the basic physical structures, mechanisms, and subsystems for propulsion, power, thermal control, attitude determination and control, and TT&C (telemetry, tracking, and command) communications and processing.
NIST IR 8270