Study for Space Electronics Electromagnetic Mitigation, 15-9533Printer Friendly Version
Inclusive Dates: 02/15/05 06/15/05
Background - Deteriorating electromagnetic interference (EMI) performance for Space Systems Command and Data Handling Systems (C&DHS) was traced through several programs that shared a common design heritage. As a result, whenever our clients discussed follow-on programs, EMI performance was frequently labeled as a significant program risk. Because of the immediacy of impending program negotiations (Wise and Hubble), we sought and received internal research support in as attempt to permanently retire the issue.
Approach - We employed a multistep process to highlight common characteristics, parameters, and conduits as appropriate. Our goal was to identify the EMI design shortcomings and recommend improvements wherever possible. Our approach included the following:
Accomplishments - Our analysis of heritage designs revealed several violations of "best EMI engineering practice." The focused analysis resulted in approximately 30 recommendations to improve EMI design approximately 17 of which have direct impact on board design. Our EMI experiment revealed shortcomings in both EMI filtering application and employment of free-space attenuation opportunities. The radiated emissions data findings and follow-on analysis included one specific design change recommendation and a recommendation for programmatic philosophy changes to support the design change. The conducted emissions data findings and follow-on analysis included identification of a commercial off-the-shelf (COTS) product to improve our EMI performance and two recommendations for additional investigation.