An overview of what the integrated PLM provides:
Structural support
The PLM has a 'box' shape structure with a central cylinder as the main structural load path to the Service Module (SVM). It houses the payload instruments (see relevant article 'instrument summary') and the payload support systems. Instrument sensors and antennas are mounted on the external panels, while most of the electronics units are accommodated inside the PLM.
Thermal control
Thermal control of the PLM is in charge of maintaining all electronics and instruments in predefined operational and non-operational temperature limits.
Measurement data acquisition, handling, and storage
Scientific data acquisition, formatting, encryption and storage. A dedicated unit is implemented to adapt the National Oceanic and Atmospheric Administration (NOAA) interfaces to European standards for the American instruments.
Electrical power
Each unit or instrument is powered through a switchable and protected line, provided by specific PLM units. Unregulated power is distributed to the European instruments while a dedicated unit is providing the American instruments with regulated 28 V power.
Command and control for the PLM elements
A dedicated data bus, based on the European On-Board Data Handling Standard (OBDH), is used by the PLM. The Payload Module Computer (PMC) receives commands from the SVM and interfaces with the European instruments Instrument Control Units (ICUs) and Microwave Humidity Sounder Protocol Conversion Unit (MPU), as well as with a specific PLM unit for the American instruments (NIU).
Measurement data transmission to ground
Involves the transmission to ground of Consultative Committee for Space Data Systems (CCSDS) packetised data through the High Resolution Picture Transmission (HRPT), Low Resolution Picture Transmission (LRPT) and X-band links.
