Engineering topics

Rogers, A. E. E.

Publications and source records attributed to Rogers, A. E. E..

At least 73 records · Page 4

NASA NTRS1972

Interferometric observations of an artificial satellite.

Very-long-baseline interferometric observations of radio signals from the TACSAT synchronous satellite, even though extending over only 7 hours, have enabled an excellent orbit to be deduced. Precision in differential delay and delay-rate measurements reached 0.15 nanosecond and 0.05 picosecond per second, respectively. The results from this initial three-station experiment demonstrate the feasibility of using the method for accurate satellite tracking and for geodesy.

Preston, R. A.↗

NASA NTRS1971

Martian craters and a scarp as seen by radar.

Radar observations of Mars with a surface resolution of 1.3 deg in latitude and 0.8 deg in longitude have been carried out during the opposition of 1971. With a precision in surface height measurement approaching 75 meters in regions of high reflectivity, it has been possible to measure the detailed characteristics of a number of craters. Many of these can be identified with craters shown in Mariner photographs of Mars. In addition, a scarp has been seen at 41 deg west, 14 deg south with an average slope of about 6 deg extending over about 40 kilometers.

Pettengill, G. H.↗

NASA NTRS1971

Quasars revisited - Rapid time variations observed via very-long-baseline interferometry

Quasar internal kinematics and fine structure rapid time variations from radio interferometry

Clark, T. A.↗

NASA NTRS1970

Radar measurements of the surface topography and roughness of Mars

Mars surface topography and roughness from radar measurements

Ash, M. E.↗

NASA NTRS1968

The structure of the OH source in W3.

Interferometric study of OH emission source in W3 /IC 1795/ region, processing data on digital computer

Ball, J. A.↗

NASA NTRS1968

The 18-cm flux of the unresolved component of 3C 273.

Fringe amplitude measurement of 3C 273 using interferometer at 18 cm wavelength

Ball, J. A.↗

NASA NTRS1968

Excitation temperature of the 18-cm line of OH in H I regions.

Excitation temperature of 18 cm line of OH in H 1 clouds, discussing excitation mechanisms and OH/H abundance ratios

Barrett, A. H.↗

NASA NTRS1968

Anomalous OH absorption in the direction of Cassiopeia A.

Complex OH emission spectra in direction of Cassiopeia A at four ground state frequencies in terms of Zeeman patterns, noting anomalous absorption

Barrett, A. H.↗

NASA NTRS1967

Spectral line interferometry with independent time standards at stations separated by 845 kilometers.

Upper limit of arc for hydroxyl /OH/ emission region associated with radio source W3, using Michelson interferometer consisting of two spaced radio telescope stations

RADIO TELESCOPE↗

NASA NTRS1967

Observations of OH emission in the H II REGION W3 with a 74400 lambda interferometer.

OH emission in H II region W3, using improved equipment

HYDROXYL↗

NASA NTRS1967

The Haystack-Millstone interferometer system

Haystack Millstone interferometer system for high resolution radiometric studies

MICROWAVE INTERFEROMETER↗

NASA NTRS1967

The positions and angular extent of OH EMISSION associated with the H II regions W3, W24, W49, and NGC 6334.

OH emission regions investigated using Millstone and Haystack antennas with interferometer, noting radio sources for base-line calibration and instrumental phase monitoring

RADIO ASTRONOMY↗

NASA NTRS1967

Angular size of OH emission regions.

Angular diameters of OH lambda-doublet frequencies emitting regions using interferometry

Ball, J. A.↗

NASA NTRS1967

Anomalous OH absorption in the direction of Cassiopeia A.

SHF OH absorption lines in Cassiopeia A spectrum, noting 1665 and 1667 MHz lines split

Barrett, A. H.↗

NASA NTRS1966

Radio astronomy

Radio astronomy studies in 18-cm line emission sources, fringe visibility of bright radio sources, and spectral features of Venus and Jupiter

INTERFEROMETRY↗

NASA NTRS1966

Interferometric study of cosmic line emission at OH frequencies.

Interferometric observation of cosmic emission at OH frequency, noting emission source dimensions

COSMIC RADIATION↗

NASA NTRS1966

Observations of circularly polarized OH EMISSION and narrow spectral features.

OH emission and narrow spectral features made with circularly polarized field horn on 140-ft radio telescope in November 1965

GALACTIC RADIO WAVE↗

NASA NTRS1966

Anomalous OH Absorption in the Direction of Cassiopeia a

Anomalous OH absorption in direction of Cassiopeia A

ABSORPTION SPECTRUM↗