Site accessibility analysis for advanced lunar missions Vol I - Summary. Final report
Mission analysis procedure for determining approximate lunar areas of accessibility for mission planning
LUNAR LANDING SITE↗
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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Random access-random release relay switching matrix
XY relay switching matrix provides complete random access and random release of 400 points. A mercury-wetted bistable relay with independent set and reset coils is the unique feature associated with each point.
Carter, J. A.↗
Time Division Multiple Access /TDMA/ system, phase 1 Final report
Synchronization equipment for time division multiple access system for medium altitude satellite and small ground stations
Source record↗
Time division access feasibility study modulation and synchronization considerations
Time division access system for satellite communications, and figure of merit for effects of bit and frequency synchronization
Dooley, G. F.↗
A TDM synchronization system for multiple access satellite communication
Time Division Multiple Access /TDMA/ system for satellite communication with ground station system
Allen, W. K.↗
Accessibility ellipse and minimum energy trajectories.
Unpowered orbital transfer and flight paths, discussing accessibility elliptical boundary and minimum energy trajectories
Eades, J. B., Jr.↗
The impact of manufacturing on design as related to accessibility.
Spacecraft assembly and maintenance accessibility, discussing impact of manufacturing on design
Franklin, W. J.↗
Synchronization experiment for a time division multiple access satellite communication system
Doppler compensation for maintaining signal synchronization of time division multiple access
Allen, W. K.↗
A multiple-access satellite relay system for low data rate users
Multiple access satellite relay system for low data rate users
Gilchriest, C. E.↗
Short term frequency stability measurements of the applications technology satellite no. 1 multiple access communication system.
Short term frequency stability and spectral purity measurements of ATS 1 multiple access communication system
Kuegler, G. K.↗
Access of solar protons into the polar cap - A persistent north-south asymmetry.
Solar protons delayed access into polar regions during 2 November 1967 solar particle event, discussing north-south asymmetry
Evans, L. C.↗
Site accessibility and characteristic velocity requirements for direct-descent lunar landings
Site accessibility and velocity requirements for direct descent lunar landings
Weyers, V. J.↗
On multiple demand access satellite systems for speech communications in remote areas
Multiple access communication satellite systems providing reliable speech communication for low density use in remote areas
Hurd, W. J.↗
A random multiple access technique for satellite data collection
Random multiple access technique for satellite data collection, taking advantage of frequency instability associated with oscillator circuits
Arndt, A. E.↗
Asymmetric access of energetic solar protons to the earth's north and south polar caps
Energetic solar protons asymmetric access to north south polar caps by satellite observation during 24 January 1969 event
Fennell, J. F.↗
Design and performance evaluation of a wideband FM spread-spectrum multiple-access system
The system described performs the tracking and communications functions of a tracking and data relay satellite system (TDRS). The spread-spectrum signal format is achieved through wide deviation FM by a sinusoidal subcarrier unique to each multiple-access user. A compound phase-locked loop tracks carrier and subcarrier and demodulates data and ranging signals. Design parameters of user and ground terminals for TDRS are given. Acquisition procedures are described. Performance analyses are presented including the effects of noise, RFI, multipath and other users.
Wachsman, R. H.↗
Access to uncombined titanium through an inhibiting film in sublimation pumping of deuterium
It was demonstrated, through a series of experiments, that it is possible (by the addition of a thin layer of titanium to an apparently occluded surface) to gain access to previously deposited sublayers of uncombined titanium in spite of the presence of an inhibiting film (such as an oxide) on the surface.
Steinberg, R.↗
An investigation of a sterile access technique for the repair and adjustment of sterile spacecraft
A description is presented of a unique system for the sterilization and sterile repair of spacecraft and the results of a test program designed to assess the biological integrity and engineering reliability of the system. This trailer-mounted system, designated the model assembly sterilizer for testing (MAST), is capable of the dry-heat sterilization of spacecraft and/or components less than 2.3 meters in diameter at temperatures up to 433 K and the steam sterilization of components less than 0.724 meter in diameter. Sterile access to spacecraft is provided by two tunnel suits, called the bioisolator suit systems (BISS), which are contiguous with the walls of the sterilization chambers. The test program was designed primarily to verify the biological and engineering reliability of the MAST system by processing simulated space hardware. Each test cycle simulated the initial sterilization of a spacecraft, sterile repair of a failed component, removal of the spacecraft from the MAST for mating with the bus, and a sterile recycle repair.
Farmer, F. H.↗