Results 241 to 250 of about 230,956 (294)
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Science, 2004
Saturn's satellite Iapetus has the largest albedo asymmetry of any natural satellite, with the optical albedo of its trailing hemisphere as much as 10 times that of its leading hemisphere ([ 1 ][1]).
Gregory J, Black +3 more
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Saturn's satellite Iapetus has the largest albedo asymmetry of any natural satellite, with the optical albedo of its trailing hemisphere as much as 10 times that of its leading hemisphere ([ 1 ][1]).
Gregory J, Black +3 more
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Science, 1989
Radar echoes from the martian satellite Phobos provide information about that object's surface properties at scales near the 3.5-cm observing wavelength. Phobos appears less rough than the moon at centimeter-to-decimeter scales. The uppermost few decimeters of the satellite's regolith have a mean bulk density within 20% of 2.0 g cm
S J, Ostro +4 more
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Radar echoes from the martian satellite Phobos provide information about that object's surface properties at scales near the 3.5-cm observing wavelength. Phobos appears less rough than the moon at centimeter-to-decimeter scales. The uppermost few decimeters of the satellite's regolith have a mean bulk density within 20% of 2.0 g cm
S J, Ostro +4 more
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Eos, Transactions American Geophysical Union, 1947
Radar photographs of thunderstorms and the Florida hurricane of September 1945 were shown to illustrate structure of those storms (see Fig. 1). The relation between radar echoes and the reflecting material in the storms was discussed. Previous research has shown the intensity of the return radiation, among other things, to be proportional to the number
Donald M. Swingle, Raymond Wexler
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Radar photographs of thunderstorms and the Florida hurricane of September 1945 were shown to illustrate structure of those storms (see Fig. 1). The relation between radar echoes and the reflecting material in the storms was discussed. Previous research has shown the intensity of the return radiation, among other things, to be proportional to the number
Donald M. Swingle, Raymond Wexler
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Radar Tomography For Cavities Detection
9th EEGS Symposium on the Application of Geophysics to Engineering and Environmental Problems, 1996Preliminary tests on laboratory models have enabled us to provide some guidelines for traveltime ray tomography with GPR applied to civil engineering problems, specifically to find voids in pillars, walls and structures. The width of the Fresnel zone and the source and receiver locations are the limits to resolution capability. For crosshole geometry a
Stefano Valle, Luigi Zanzi
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RADAR DETECTION OF PRECIPITATiON
Journal of Meteorology, 1946Abstract Detection of precipitation by radar is possible because of the scattering of high-frequency radio waves by precipitation forms. Radar echoes being thus directly related to precipitation may be classified in a simple manner according to meteorological origin.
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Compressive CFAR radar detection
2012 IEEE Radar Conference, 2012In this paper we develop the first Compressive Sensing (CS) adaptive radar detector. We propose three novel architectures and demonstrate how a classical Constant False Alarm Rate (CFAR) detector can be combined with l 1 -norm minimization. Using asymptotic arguments and the Complex Approximate Message Passing (CAMP) algorithm we characterize the ...
Anitori, L. +4 more
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1999
Target detection is a probabilistic idea; noise and clutter prevent us from being certain to find the targets we are looking for, and will normally present us with plenty of 'targets' we are not looking for. We can only define the probabilities of detection and of false alarm that we are prepared to live with.
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Target detection is a probabilistic idea; noise and clutter prevent us from being certain to find the targets we are looking for, and will normally present us with plenty of 'targets' we are not looking for. We can only define the probabilities of detection and of false alarm that we are prepared to live with.
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Radar waveform synthesis method--A new radar detection scheme
IEEE Transactions on Antennas and Propagation, 1980A new scheme for radar detection and discrimination, the radar waveform synthesis method, is investigated. This scheme consists of synthesizing the waveform of an incident radar signal which excites the target in such a way that the return radar signal from the target contains only a single natural resonance mode of the target.
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2012
This chapter consists of noise-limited radar range equation, detections in noise, minimum detectable signal, processing gain via pulse integration and radar cross section.
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This chapter consists of noise-limited radar range equation, detections in noise, minimum detectable signal, processing gain via pulse integration and radar cross section.
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OCEANS '85 - Ocean Engineering and the Environment, 1985
The performance of marine radar for ice detection is investigated using iceberg observational data collected during three years of offshore drilling in the Labrador Sea region. One thousand "first sightings" of icebergs during drilling operations revealed a maximum range of detection of 87km, with the median value being 27.8km.
J. Miller, K. Satterfield
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The performance of marine radar for ice detection is investigated using iceberg observational data collected during three years of offshore drilling in the Labrador Sea region. One thousand "first sightings" of icebergs during drilling operations revealed a maximum range of detection of 87km, with the median value being 27.8km.
J. Miller, K. Satterfield
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