A scientific study of the problems of digital engineering for space flight systems,
with a view to their practical solution.
"We've taken a hit, but we're back."   Enter klabs.org original home page

Design Guideline: "On-card Regulators and Voltage Margin Testing" MRO Spaceflight Computer Side Swap Anomalies (RAD750) Some Recent White Papers Definitions of Hardware, Software, and Firmware for Digital Logic Systems On the Use of the Term "Firmware" Are Functions Implemented with Digital Electronics to Avoid Fundamental Verifications? Complexity and Logic Design. (In writing) NASA Study: Flight Software Complexity   Examples of program sizes and a discussion of complexity.	Design Note: AX High Speed Sequencers has been added to the RTAX-S and AX Application Notes Page.  Performance of a power-on reset circuit and a 10-stage ring counter was measured.  The limits of the on-chip PLL were explored. Design Note: AX LVDS Input Speed Test has been added to the RTAX-S and AX Application Notes Page.  600 MHz operation was achieved. A few interesting articles: "Hubble Servicing Challenges Drive Innovation of Shuttle Rendezvous Techniques" "AES and Antifuses: FPGA Security" "A Comparison of Bus Architectures for Safety-Critical Embedded Systems," John Rushby "Apollo Spacecraft," George Low, NASA MSC
Apollo 13 Guidance, Navigation, and Control Challenges Service Module photographed after separation from the Lunar Module and Command Module. Abstract: Combustion and rupture of a liquid oxygen tank during the Apollo 13 mission provides lessons and insights for future spacecraft designers and operations personnel who may never, during their careers, have participated in saving a vehicle and crew during a spacecraft emergency. Guidance, Navigation, and Control (GNC) challenges were the reestablishment of attitude control after the oxygen tank incident, re-establishment of a free return trajectory, resolution of a ground tracking conflict between the LM and the Saturn V S-IVB stage, Inertial Measurement Unit (IMU) alignments, maneuvering to burn attitudes, attitude control during burns, and performing manual GNC tasks with most vehicle systems powered down. Debris illuminated by the Sun and gaseous venting from the Service Module (SM) complicated crew attempts to identify stars and prevented execution of nominal IMU alignment procedures. Sightings on the Sun, Moon, and Earth were used instead. Near continuous communications with Mission Control enabled the crew to quickly perform time critical procedures. Overcoming these challenges required the modification of existing contingency procedures.
Some Lunar Orbiter Laser Altimeter Data

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NASA has stopped funding the server for klabs.org so I have purchased space on a different server.  I have uploaded almost all of the content but I still have a bit of cleanup work to do.  Feel free to send me information about any broken links, or material or ideas that you have for klabs.org.  Rich Katz (info@klabs.org)