Systems Engineering Bob Goeke 27 June 2005 System Engineering

System Block Diagram 27 June 2005 System Engineering

Configuration Management and Peer Review Process Process documented in 32-01201 Rev A We maintain reference, Bookmark, and Controlled documentation Reference: GSFC project documents, vendor data sheets Bookmark: what most folks call DRAFT Controlled: must go through Configuration Management Board All revisions of all documentation are maintained on public web site http://snebulos.mit.edu/projects/crater/ Peer reviews are an incremental process run in parallel with the ECO process Peer review validate the proposed initial or changed design ECO process controls the documentation Review board meets in public every Wednesday 27 June 2005 System Engineering

ICD Status Data ICD At Rev. B awaiting GSFC Sign-off Electrical ICD Draft returned to GSFC with comments Mechanical ICD Draft 2 returned to GSFC with comments Thermal ICD Draft returned to GSFC with comments (We owe s/c model inputs) 27 June 2005 System Engineering

Miscellaneous Requirements Contamination Control (32-01203 Rev 06) Our internal requirements are modest; waiting to see Project requirements Detectors could develop surface leakage if particulates accumulate on surface Exposed electrical connections to detectors could lose conductivity if attacked by (primarily) salt atmosphere Purge This is a precaution against air borne contamination, esp. during I&T Handling At 5Kg total mass, we are in the “pick up and carry” class 27 June 2005 System Engineering

System Resources Mass Power Data Rate Proposal 4.3 Kg 4.6 watts 200/2K/200Kbps Peak 6 Kg 12 watts 1K/100Kbps CBE 5.0 Kg 5.1 watts 515/86.6Kbps Allocation 5.6 Kg 6.0/9.0 watts 86.6Kbps Margin 12% 18%/76% n/a Request add. Allocation 0.4 Kg 27 June 2005 System Engineering

27 June 2005 System Engineering