The EGSE  for the PRISMA satellite consists of a standard 19” industrial rack equipped with 4 drawers named:

The EGSE  for the PRISMA satellite consists of a standard 19” industrial rack equipped with 4 drawers named:

  • 1553 BUS I/F Unit

The foreseen interfaces are:

  • a HOTLink input port to simulate the satellite PDHT
  • a Mil-STD-1553 interface to handle the data link for the telecommand and telemetries exchange
  • power supply outputs and commands (switch On/Off) to the PRISMA instrument. Both main and redundant interfaces are implemented.
  • power supply outputs and relevant On/Off commands to the 2 ”de-icing” heaters and the 2 ”survival” heaters
  • 16 thermistors input channels. The former 8 channels are used for the temperature monitoring of the PRISMA main and redundant units; the latter 8 channels are to be applied to the instrument during the climatic chamber testing


 The SDAB EGSE is based on a custom board designed by TSD. The following functionalities are performed by the SDAB EGSE:

  • Architecture based on IBM PowerPC Processor (750 family running @ 600 MHz) and FPGA (Xilinx Virtex 4); processor and FPGA communicate by means of a PCIx bus @ 66 MHz
  • High-speed reception link of scientific and video data from Main Electronic of PRISMA Payload implemented by using 4 HOTLink receivers (data rate up to 750 Mb/s)
  • On board storage of scientific and video data received on High-speed reception link on HDD (capacity 60 GB, SATA II I/F)
  • Simulation of TM/TC (physical level LVDS) of the Payload Single Board Computer (SBC)
  • Simulation of video data (physical level Channel Link) of SWIR, VNIR and PAN Proximity Electronics
  • Retrivial by ethernet I/F  (10/100/1000) of stored data for off-line analysis


The 1553 Bus I/F Unit



The 1553 Bus I/F Unit is based on the BU-67103U product by Data Device Corporation (DDC). The main features of the 1553 Bus I/F Unit are:

  • interface to 2 dual-redundant MIL-STD-1553
  • each 1553 channel can operate in Bus Controller (BC) or Multi-RT (0 to 31) modes, and each mode has the ability to run a concurrent Bus Monitor (MT)
  • 1 MB of RAM per 1553 channel
  • 48-bit message time tagging with a programmable resolution down to 100ns, IRIG-B time code input, 1 PPS output
  • transformer and direct coupling, triggers, extensive BC & RT frame structures
  • error detection
  • RT Status Bit and Mode Code responses, along with advanced BC functionality