CASSINI In Space

 

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CASSINI

Cassini MIMI Investigation at Fundamental Technologies

 

 Historical MIMI Memos and Notes

 

Data Processing Unit

 

J. Dandouras, MIMI team meeting, October 1994

 

Preliminary Mass Estimate

 

Note: Estimate does not include box, box mounted connectors, board brackets, analog electronics interface connectors, and eventual spot shielding.

 

EPU and CPU boards 2 x 310
Memory board 245
LEMMS-BIU I/F board 265
BIU 250
BIU filter board 25**
Motherboard (including Motherboard mounted connectors) 350
BIU cables and connector to Motherboard 60
LEMMS cables and connector to LEMMS I/F board 40

TOTAL:   

 1855 g

 

**If we use a DC/DC converter the weight will be increased.

 

Preliminary Power Estimate

 

Notes:

 

1. Microprocessor speed considered is 6 MHz.
2. Booting power is not included.
3. BIU power is not included.
4. Margins are not included.
5. Estimate after measurement of Bread Board power.

 

EPU Board 186 mA -->930 mW
CPU Board 186 mA -->930 mW
Memory Board 30 mA -->150 mW
LEMMS Board 16 mA -->150 mW

TOTAL:   

 1090 mW

 

MIMI DPU Schedule

 

  • Bread Board 1
    • 20 Oct 94: I/F tests with A.E./VTT Motor/(LEMMS)
    • to 15 Dec 94 tests and validation of the schematics
  • Bread Board 2 (motherboard + 1 processor board + BIU I/F board + BIU)
    • 20 Nov 94: delivery to APL
  • EM1/EM2
    • 15 Dec 94 to 15 Feb 95: board conception and fabrication
    • 15 Feb 95 to 15 Mar 95: DPU tests
    • 15 Mar 95: I/F test at CESR (LEMMS/Motor/A.E.)
    • 10 April 95: delivery EM1 to APL
    • 10 April 95 to 1 May 95: update on EM2
    • 26-27 April 95: CDR to JPL
    • 1 May 95 to 1 June 95: tests and validation hardware
  • FM
    • 1 June 95 to 1 Sept 95: FM fabrication
    • 1 Sept 95 to 31 Dec 95: tests
    • end Dec 95: delivery to APL

 

 

Return to DPU main table of contents page.

Return to Historical MIMI Notes and Memos main page.

Return to Cassini MIMI table of contents page.
Return to Fundamental Technologies Home Page.



Updated 8/8/19, Cameron Crane

QUICK FACTS

Manufacturer: The Cassini spacecraft was manufactured by NASA's Jet Propulsion Laboratory, and the Huygens Probe was manufactured by Thales Alenia Space.

Mission Duration: The Cassini-Huygens mission launched on October 15 1997, and ended on September 15 2017.

Destination: Cassini's destination was Saturn and its moons. The destination of the Huygens Probe's was Saturn's moon Titan.

Orbit: Cassini orbited Saturn for 13 years before diving between its rings and colliding with the planet on September 15th, 2017.