FECTS AND TEST ISSUES FOR SATELLITE APPLICATIONS Paul W. Marshall, Consultant Cheryl J. Marshall, NASA Goddard Space Flight Center SECTION V V 1-68 SYSTEM LEVEL MITIGATION STRATEGIES William F. Heidergott Motorola, Inc., Satellite Communications Group AFTERWORD Order information for Short Course CD ROM 1999 IEEE NSREC SHORT COURSE SECTION I INTRODUCTION Daniel M. Fleetwood Sandia National Laboratories Approved for public release; distribution is unlimited. INTRODUCTION This Short Course covers in a tutorial fashion selected topics of relevance to space telecommunications systems. This is the 20th year in which the Short Course has been offered in conjunction with the IEEE Nuclear and Space Radiation Effects Conference (NSREC). The themes of the short course are selected each year to reflect the varying interests and requirements of the attendees of the IEEE NSREC. This year's theme "RADIATION EFFECTS IN THE SPACE TELECOM ENVIRONMENT" is especially appropriate given the emerging interest in large-scale commercial space telecommunications systems. However, the information contained within the four segments should be useful to all systems that must operate reliably in the challenging radiation environment of space. The greatest challenge to commercial success in space is the integration of commercial and custom components into a system that can achieve its mission reliably and affordably. Rising to this challenge requires knowledge of the space radiation environment external to and within the satellite or spacecraft of interest, the effects of the environment on electronic and photonic devices, and system engineering techniques to mitigate these effects where possible. These requirements present significant constraints on component selection, and on system design and operation. The space tele- communications systems that best meet these challenges through proper assessment of the environment, disciplined parts selection and testing, judicious use of design margin, and efficient system design and integration will be 