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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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Navigational accuracy of two way Doppler tracking of interplanetary spacecraft during heliocentric and planetary encounter trajectory phases
Atlas/Centaur/Surveyor flights guidance accuracy, discussing postflight analysis of injection errors due to hardware, software and propulsion system
Modified die set improves accuracy in load application, minimizes problems of parallelism, and eliminates testing errors normally encountered during flexure tests. Test results are given for a comparison test of the old and new fixtures.
Pointing accuracy of orbiting gimbal mounted telescope by two mathematical models
Ionospheric perturbations on STADAN very high frequency tracking accuracy
High accuracy timing systems using satellite atomic clocks
Finite element approximation accuracy and extent of errors in structural problems
Deep Space Network tracking and navigational accuracy analyses, lunar gravimetry, terrestrial gravitational constant, and orbit calculations for planetary orbiter
X-15 flight heating simulation accuracy tested and inaccuracy effects on flight load strain gage responses
Accuracy of Explorer 32 probe electron density and temperature measurements
Portable alignment gyrocompass system accuracy, repeatability, portability, and errors
Apollo navigational accuracy in lunar orbit including landmark updating
High accuracy precession measurement with autometric gyroscopes
Lunar orbit navigation and landing accuracy
Factors influencing guidance accuracy of planetary probes
Lunar module navigation systems accuracies for powered descent, ascent, and abort trajectories
Control systems for high accuracy earth pointing attitude motions of satellite configurations in elliptic orbits
Accuracy studies of radar and optical tracking of GEOS-C for altimeter experiment