• LSI Devices for Fault-Tolerant Spaceborne Computer

      Bennett, Charles; Raytheon Company (International Foundation for Telemetering, 1978-11)
      In order to meet the requirements for future satellite applications, a brassboard of an extremely reliable fault-tolerant spaceborne computer (FTSC) has been developed by Raytheon Co., Sudbury, MA., under the sponsorship of the USAF/SAMSO*. The requirements for the FTSC were high reliability, high speed, low power, high density and tolerance to space radiation environments. The reliability requirements were realized through several unique system and circuit concepts while the remaining requirements could only be realized through use of large-scale-integrated (LSI) circuit technology. An assessment of possible candidates for the LSI requirements for the FTSC was performed on available and emerging technologies. Once the candidate LSI technology was selected, a "proof-of-technology" program was instituted. The program included the development of a test chip to prove the operational characteristics of the technology and its producibility. Development of flyable prototypes of the FTSC using LSI devices is the final program goal.
    • The Wide-Band Signal Processor

      Stiffler, J. J.; Raytheon Company (International Foundation for Telemetering, 1978-11)
      The Wide-Band Signal Processor (WBSP) is a spaceborne communications processor designed to operate as a peripheral to the Fault-Tolerant Spaceborne Computer (FTSC) currently being developed for the U. S. Air Force. Its function is to demodulate and decode received FDM and TDM signals and to re-encode the recovered information and use it to modulate signals for retransmission. The major difference between the WBSP and other processors designed to perform similar functions is in the fact that the WBSP, like the FTSC itself, is designed to survive its own hardware malfunctions.