Accession Number : AD0766455

Title :   A System of Software for the TRIAD Flight Computer.

Descriptive Note : Technical memo.,

Corporate Author : JOHNS HOPKINS UNIV SILVER SPRING MD APPLIED PHYSICS LAB

Personal Author(s) : Yuhasz,R. S. ; Utterback,H. K. ; Newcomer,M. R.

Report Date : MAY 1973

Pagination or Media Count : 109

Abstract : The TRIAD satellite provided APL with its first opportunity to fly a general-purpose digital computer. The paper presents the system of software that was written to develop, test, and operate the APL-designed TRIAD computer. After a description of the machine's real-time flight requirements and its physical properties, the major software projects are discussed. These include the formulation of: Programming language, called ARTIC, and an associated assembler; special-purpose diagnostic and utility programs; a real-time simulation of the expected satellite hardware environment; an in-flight operating system, called LDR, capable of coping with various real-time operational demands. Lastly, the actual performance and utility of the computer after launch is summarized. TRIAD exemplifies the value of a small, programmable computer in managing and supporting complex satellite missions. (Author)

Descriptors :   (*NAVIGATION SATELLITES, FLIGHT CONTROL SYSTEMS), (*COMPUTER PROGRAMMING, NAVIGATION COMPUTERS), DATA PROCESSING, REAL TIME, MEMORY DEVICES, COMPUTER PROGRAMS

Subject Categories : Computer Programming and Software
      Computer Hardware
      Unmanned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE