Astrodynamical results from the radio tracking of the mariner venus and ranger lunar missions.
Earth based radio tracking and orbit determination accuracies for Ranger and Mariner missions
ORBIT CALCULATION↗
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Results for “GROUND TRACK”
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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Analog study of the longitudinal response of a swept-wing transport airplane to wind shear and sustained gusts during landing approach
Analog computed time histories and altitude-ground track plots of swept wing transport aircraft longitudinal response to wind shear and sustained gusts during landing approaches
Snyder, C. T.↗
Unified S-band receiver-exciter subsystem
Functional capabilities and physical arrangement of receiver exciter subsystem in unified S band Apollo communications and tracking ground station system
Bunce, R. C.↗
Computer storage of contour-map data.
Representation for computer storage of contour map data for searching problem involving determination of aircraft ground track
Morse, S. P.↗
Concepts of use in contour map processing.
Generalized techniques for contour maps problem solution applied to problem of locating ground track of aircraft from elevation readings obtained during flight
Morse, S. P.↗
Ferrite attenuator modulation improves antenna performance
Ferrite attenuator inserted into appropriate waveguide reduces the gain of the antenna element which is causing interference. Modulating the ferrite attenuator to change the antenna gain at the receive frequency permits ground tracking until the antenna is no longer needed.
Hooks, J. C.↗
Development of guidance-monitoring techniques and guidance-monitoring experience during the Apollo 11 lunar descent
Ground tracking capabilities as guidance sensors for spacecraft in lunar descent
De Vezin, H. G., Jr.↗
Estimation of the length and orientation of the line between two closely co-orbiting satellites
Baseline length and orientation of closely co-orbiting satellites estimated by combined onboard sensor and ground tracking data
Hrastar, J.↗
Estimation of the length and orientation of the line between two closely co-orbiting satellites
Baseline length and orientation of closely coorbiting satellites estimated by combined onboard sensor and ground tracking data
Hrastar, J.↗
Skylab 3 preliminary reference Earth Resources Experiment Package (EREP) pass planning document. Volume 2: EREP sites and S190 swath study of selected revs
The ground tracks and S190 swaths are presented of selected revolutions over areas containing earth resources experiment package (EREP) sites. The following eight EREP disciplines are shown: sensor performance evaluation, forestry, geology, hydrology, land use mapping, oceanography, pollution, and weather. Most of the data reported consists of passes over the continental United States.
Lunde, A. N.↗
Skylab 4 preliminary reference Earth Resources Experiment Package (EREP) pass planning document. Volume 2: EREP sites and S190 swath study of selected revs
Ground tracks with s190 swaths of selected revolutions as they pass over areas containing EREP sites are presented. Most of the data consists of passes over the continental United States; several are shown over Australia and South America. The S190 is a 6-channel high precision 70 mm camera facility.
Lunde, A. N.↗
Apollo 16 geochemical X-ray fluorescence experiment: Preliminary report
The lunar surface was mapped with respect to Mg, Al, and Si, as Al/Si and Mg/Si ratios along the projected ground tracks swept out by the orbiting Apollo 16 spacecraft. The results confirm the observations made during the Apollo 15 flight and provide data for a number of features not covered before. The data are consistent with the idea that the moon has a widespread differentiated crust (the highlands). The Al/Si and Mg/Si chemical ratios correspond to that for anorthositic gabbro through gabbroic anorthosites or feldspathic basalts. The X-ray results suggest the occurrence of this premare crust or material similar to it as the Descartes landing site.
Adler, I.↗
Apollo 16 geochemical X-ray fluorescene experiment: Preliminary report
The lunar surface was mapped with respect to Mg, Al and Si as Al/Si and Mg/Si ratios along the projected ground tracks swept out by the orbiting Apollo 16 spacecraft. The results confirm the observations made during the Apollo 15 flight and provide data for a number of features not covered before. The data are consistent with the idea that the moon has a widespread differentiated crust (the highlands). The Al/Si and Mg/Si chemical ratios correspond to those for anorthositic gabbro through gabbroic anorthosites or feldspathic basalts. The X-ray results suggest the occurrence of this premare crust, or material similar to it, at the Descartes landing site.
Adler, I.↗
Sonic-boom ground-pressure measurements from Apollo 15
Sonic boom pressure signatures recorded during the launch and reentry phases of the Apollo 15 mission are presented. The measurements were obtained along the vehicle ground track at 87 km and 970 km downrange from the launch site during ascent; and at 500 km, 55.6 km, and 12.9 km from the splashdown point during reentry. Tracings of the measured signatures are included along with values of the overpressure, impulse, time duration, and rise times. Also included are brief descriptions of the launch and recovery test areas in which the measurements were obtained, the sonic boom instrumentation deployment, flight profiles and operating conditions for the launch vehicle and spacecraft, surface weather information at the measuring sites, and high altitude weather information for the general measurement areas.
Hilton, D. A.↗
Apollo 16 geochemical X-ray fluorescence experiment - Preliminary report.
Mapping of the lunar surface with respect to magnesium, aluminum, and silicon as aluminum/silicon and magnesium/silicon intensity ratios along the projected ground tracks swept out by the orbiting Apollo 16 spacecraft. The results confirm the observations made during the Apollo 15 flight and provide new data for a number of features not covered before. The data are consistent with the idea that the moon has a widespread differentiated crust (the highlands). The aluminum/silicon and magnesium/silicon concentration ratios correspond to those for anorthositic gabbros through gabbroic anorthosites or feldspathic basalts. The X-ray results suggest the occurrence of this premare crust or material similar to it at the Descartes landing site.
Adler, I.↗
Tesseral resonance on Imp 4 orbit.
The supersynchronous resonance occurred because the orbital period of 4 1/3 days was nearly commensurate with the earth's rotational period. The satellite was launched on May 24, 1967. The perturbation due to commensurability is discussed, giving attention to the ground track of the longitude at perigee passage and the effect of the tesseral harmonic on the time of perigee passage. The measurement of the time of perigee passage of Imp 4 is accurate enough to provide a stringent test of the third-degree tesseral terms in the model of the earth's gravitational field.
Lowrey, B. E.↗
A Wind Tunnel Flight Correlation of Apollo 15 Sonic Boom
A correlation of sonic boom pressure signatures recorded during reentry of the Apollo 15 command module with wind-tunnel signatures extrapolated to flight distances has been made for Mach numbers of 1.16 and 4.57. The flight pressure signatures were recorded by pressure sensors located onboard ships positioned near the ground track while the wind-tunnel signatures were measured during tests of a 0.016-scale model of the command module. The agreement between estimates based on wind-tunnel data and flight measurements was better at Mach 4.57 than at Mach 1.16.
Hicks, R. M.↗
Error analysis of earth physics satellite systems
Error analysis of distant-satellite-to-close-satellite range-rate, satellite-to-sea altimetry, and ground station to satellite range are made by simulations in which observational variances are assumed, observation equations are formed, and normal equations incremented. The final normal equation matrix is inverted to obtain standard deviations and correlation coefficients. The natural parameters solved for are the broad variations of the gravity field, represented by harmonic coefficients; local variations of gravity, represented by point masses; and the departure of the sea level from the geoid, represented by area means. A standard case of a low (263 km) polar close satellite, three equatorial geosynchronous satellites, and eight ground tracking stations is set up.
Kaula, W. M.↗