431-SPEC-000008 Revision A Effective Date: 6/22/2006 Expiration Date: 6/22/2011 CHECK WITH LRO DATABASE AT: https://lunarngin.gsfc.nasa.gov/ TO VERIFY THAT THIS IS THE CORRECT VERSION PRIOR TO USE. Lunar Reconnaissance Orbiter Project Electrical Systems Specification June 8, 2006 Goddard Space Flight Center Greenbelt, Maryland National Aeronautics and Space Administration LRO GSFC CMO June 22, 2006 RELEASEDLRO Project Electrical Systems Specification 431-SPEC-000008 Revision A CHECK WITH LRO DATABASE AT: https://lunarngin.gsfc.nasa.gov/ TO VERIFY THAT THIS IS THE CORRECT VERSION PRIOR TO USE. CM FOREWORD This document is a Lunar Reconnaissance Orbiter (LRO) Configuration Management (CM)-controlled document. Changes to this document require prior approval of the applicable Configuration Control Board (CCB) Chairperson or designee. Proposed changes shall be submitted to the LRO CM Office (CMO), along with supportive material justifying the proposed change. Changes to this document will be made by complete revision. Questions or comments concerning this document should be addressed to: LRO Configuration Management Office Mail Stop 431 Goddard Space Flight Center Greenbelt, Maryland 20771LRO Project Electrical Systems Specification 431-SPEC-000008 Revision A CHECK WITH LRO DATABASE AT: https://lunarngin.gsfc.nasa.gov/ TO VERIFY THAT THIS IS THE CORRECT VERSION PRIOR TO USE. Signature Page Prepared by: Original Signed By_________ 6/22/2006_ Philip Luers Date RLEP Avionics Systems GSFC/NASA, Code 561 Reviewed by: Original Signed By_________ 6/22/2006_ Dave Everett Date LRO Mission Systems Engineer GSFC/NASA, Code 599 Approved by: Original Signed By_________ 6/22/2006 Craig Tooley Date LRO Project Manager GSFC/NASA, Code 431LRO Project Electrical Systems Specification 431-SPEC-000008 Revision A CHECK WITH LRO DATABASE AT: https://lunarngin.gsfc.nasa.gov/ TO VERIFY THAT THIS IS THE CORRECT VERSION PRIOR TO USE. LUNAR RECONNAISSANCE ORBITER PROJECT DOCUMENT CHANGE RECORD Sheet: 1 of 1 REV LEVEL DESCRIPTION OF CHANGE APPROVED BY DATE APPROVED Rev - Rev A Released per 431-CCR-000005 Released per 431-CCR-000143 C. Tooley C. Tooley 7/20/2005 6/22/2005LRO Project Electrical Systems Specification 431-SPEC-000008 Revision A CHECK WITH LRO DATABASE AT: https://lunarngin.gsfc.nasa.gov/ TO VERIFY THAT THIS IS THE CORRECT VERSION PRIOR TO USE. List of TBDs/TBRs Item No. Location Summary Ind./Org. Due Date 6 Figure 3-6 and Figure 3-7 Mini-RF RF sensitivities M. Reden 6/1/06 7 Table 3-3 Mini-RF TX Frequencies M. Reden 6/1/06LRO Project Electrical Systems Specification 431-SPEC-000008 Revision A CHECK WITH LRO DATABASE AT: https://lunarngin.gsfc.nasa.gov/ TO VERIFY THAT THIS IS THE CORRECT VERSION PRIOR TO USE. iiTABLE OF CONTENTS Page 1.0 Introduction ....................................................................................................................1-1 1.1 Purpose ................................................................................................................ 1-1 1.2 Definitions........................................................................................................... 1-1 1.3 Electrical System Overview ................................................................................ 1-1 1.3.1 Electrical System......................................................................................1-2 1.3.2 Electrical System Drivers for LRO ..........................................................1-2 2.0 Documentation................................................................................................................2-1 2.1 Applicable Documents ........................................................................................ 2-1 2.1.1 NASA Documents....................................................................................2-1 2.1.2 Non-NASA Documents............................................................................2-1 2.2 Reference Documents.......................................................................................... 2-1 2.2.1 NASA Documents....................................................................................2-1 2.2.2 Non-NASA Documents............................................................................2-2 3.0 Electrical System Requirements ...................................................................................3-1 3.1 Power................................................................................................................... 3-1 3.1.1 Power Distribution and Switching Scheme..............................................3-1 3.1.2 Power System Electronics Specifications ................................................3-1 3.1.3 User (Subsystem) Specifications..............................................................3-3 3.2 System Grounding Requirements........................................................................ 3-8 3.2.1 Single-Point Primary Power Ground........................................................3-8 3.2.2 Distributed Signal Ground........................................................................3-8 3.2.3 Common Mode Noise...............................................................................3-8 3.2.4 Bonding or Mating ...................................................................................3-8 3.2.5 Shield Grounds.........................................................................................3-9 3.2.6 Grounding of External Orbiter Surfaces...................................................3-9 3.3 EMI/EMC Requirements................................................................................... 3-12 3.3.1 Conducted Emissions .............................................................................3-14 3.3.2 Radiated Emissions (RE02)....................................................................3-16 3.3.3 Conducted Susceptibility........................................................................3-16 3.3.4 Radiated Susceptibility (RS03) ..............................................................3-21 3.3.5 Orbiter RF Self-Compatibility................................................................3-23 3.4 Data and Signal Interfaces................................................................................. 3-23 3.4.1 Inter-Component