Radar studies of the moon
Dielectric constants, composition, and depths of layers of moon based on two-layer lunar model using radar echoes
RADAR ECHO↗
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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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Technical problems associated with communication satellites Supplemental report, 1 Oct. 1963 - 30 Apr. 1964
Channel capacity, propagation times, echo suppressor problems, and associated problems in development of commercial communications satellite systems
COMMUNICATIONS SATELLITE↗
El Campo solar radar system Second semiannual report, Jul. 1 - Dec. 31, 1965
Doppler characteristics of radar echoes reflected by solar corona
CORONA↗
Radar Studies of the Moon First Quarterly Progress Report
Radar echo measurements for determining lunar scattering properties
RADAR ECHO↗
Experimental and theoretical evaluation of a passive communications satellite /Echo II/
Performances of Echo II passive satellite, and passive satellite communications system
RADAR REFLECTOR↗
Venus radar investigations
Radar echo data on motion, rotation, and surface scattering properties of Venus
VENUS↗
Radio observations of Venus at Jodrell Bank
Radar observations of Venus - echo data and planetary retrograde motion
PLANETARY MOTION↗
R-F Simulator for a Long-pulse Radar
X-band target simulator with spectral purity for long radar echo pulses
TARGET SIMULATION↗
Some results of the application of intermediate-type trains in measurements of electron line density
Radio echo technique applied to measurement of electron line density in ionization trains of intermediate type
ELECTRON DENSITY↗
Turbulent motions in the upper atmosphere at heights of 80-110 km according to radio observations of meteor trains
Turbulence in upper atmosphere according to radio echo observations of meteor trains
METEOR TRAIL↗
Statistical communication theory
Modulator transfer functions for fixed and ramp input waveforms, and nonlinear homomorphic system for echo removal
ECHO SUPPRESSION↗
Further data concerning the 1963 anomalous increase in radar meteor rates
Radar echo measurements of increased meteor counts during middle months of 1963
RADAR ECHO↗
Ground-based studies of the F region in the vicinity of the midlatitude trough.
Oblique echo presence during winter nights on auroral and subauroral latitudes ionograms, analyzing electron number density of nighttime F region in midlatitude trough vicinity
IONOSPHERIC ELECTRON DENSITY↗
Radar studies of the sun at 38 Mc/s.
Radar experiments of sun at 38 mc/s, presenting results on echo variation with sunspot number, coronal irregularities, etc
RADAR ECHO↗
Stratospheric aerosol layer during 1964 and 1965.
Stratospheric aerosol concentrations observed by optical radar echoes compared with expected return from molecular atmosphere to obtain vertical profile
OPTICAL RADAR↗
Planetary Radar
Planetary radar astronomy is the study of solar system entities (the moon, asteroids, and comets, as well as the major planets and their satellites and ring systems) by transmitting radio signals towards a target and receiving and analyzing the echoes.
Aliasing antenna gain circular polarization ratio ↗
Characterizing the subglacial environment of lower Thwaites Glacier using radar modeling
Understanding the spatial heterogeneity beneath Thwaites Glacier, West Antarctica, is vital to projecting its impact on future sea levels. Radar-echo sounding (RES) is commonly used to infer subglacial conditions, but these data can be challenging to interpret. We assess basal heterogeneity across Thwaites Glacier by comparing RES returns to a radar backscattering simulator for over 400 km of RES data. The modeled variations in bed returned power exhibited a strong correlation with actual RES data in 40% of our simulated flight segments, which we consider evidence for a relatively homogeneous glacier bed. Other sites (40%) demonstrated improved fit quality when hydrology or substrate transitions were introduced in the bed material model. The remaining simulated segments (20%) were diagnosed as having more complex basal heterogeneity. The spatial distribution of complex heterogeneity appears to coincide with asymmetric patterns in the RES specularity content, which has been interpreted in previous studies as a signature for channelized hydrology. Conversely, the homogeneous substrate locations coincide with areas of fast-moving ice in western Thwaites. Our simulation method can isolate power variations induced by material heterogeneity vs topography, which is an important limitation of existing RES analysis methods.
Antarctic glaciology↗