A scientific study of the problems of digital engineering for space flight systems,
with a view to their practical solution.

68xxx Processors

Space Radiation Characterization and Recommendations for the 68332 CXL


Recommendations and Comments
The overall observed radiation performance characteristics for the 68332 C are reasonable and exploitable. The successful exploitation of any technology includes consideration of mitigation and good engineering design. Three essential areas need to be addressed with regard to radiation performance: 1) Total accumulated dose lifetime, 2) Single event upset, and 3) Single event latchup.

Spacecraft Computers on the SeaStar Satellite

Sawat Tantiphanwadi
Orbital Sciences Corporation

13th AIAA/USU Conference on Small Satellites


The SeaStar spacecraft requires a high performance computer system to handle its various requirements. It must process not only the high-rate data from the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) instrument, but also the spacecraft ground interface system and the attitude control system data. This paper will describe the spacecraft computer architecture and its hardware. With minimum peripheral changes, the same computer can be configured to perform the payload, or the ground interface, or the attitude control functions. Each flight computer consists of three computer slices and a power module. There are two main flight computers on the SeaStar satellite; the second unit is used as a back-up. To date, the satellite has not required the service of the back-up computer.

[Note: This uses a modified 68302 processor]

Last Revised: February 03, 2010
Digital Engineering Institute
Web Grunt: Richard Katz