Frequency-Selective Rasorbers: A View of Frequency-Selective Rasorbers and Their Application in Reducing the Radar Cross Sections of Antennas

2022 ◽  
Vol 23 (2) ◽  
pp. 86-98
Author(s):  
Ye Han ◽  
Yumei Chang ◽  
Wenquan Che
Keyword(s):  
Cross Sections ◽  
Radar Cross Sections ◽  
Frequency Selective

Variational estimation of radar cross-sections

1990 ◽  
Vol 137 (4) ◽  
pp. 237 ◽  
Author(s):  
D.A. Edwards ◽  
R.A. McCulloch ◽  
W.T. Shaw
Keyword(s):  
Cross Sections ◽  
Radar Cross Sections

scholarly journals Radar Observations of Comet Nuclei and Comae

2005 ◽  
Vol 13 ◽  
pp. 763-763
Author(s):  
Donald B. Campbell ◽  
John K. Harmon ◽  
Micael C. Nolan ◽  
Steven J. Ostro
Keyword(s):  
Cross Sections ◽  
Cometary Nucleus ◽  
Size Distributions ◽  
Radar Systems ◽  
The Earth ◽  
Radar Cross Sections ◽  
Short Period ◽  
Grain Size Distributions ◽  
Resolution Imaging

Nine comets have been detected with either the Arecibo (12.6 cm wavelength) or Goldstone (3.5 cm) radar systems. Included are six nucleus detections and five detections of echoes from coma grains. The radar backscatter cross sections measured for the nuclei correlate well with independent estimates of their sizes and are indicative of surface densities in the range of 0.5 to 1.0 g cm-3. Like most asteroids, comets appear to have surfaces that are very rough at scales much larger than the radar wavelength. Coma echo models can explain the radar cross sections using grain size distributions that include a substantial population of cm-sized grains. A long term goal of the cometary radar program has been the high resolution imaging of a cometary nucleus. Eleven short period comets are potentially detectable over the next two decades a few of which may be suitable for imaging. We are always waiting for the arrival of a new comet with an orbit that brings it within 0.1 AU of the earth.

Measurement of Automobile UWB Radar Cross Sections at Ka Band

2007 ◽  
pp. 586-592 ◽  
Author(s):  
Takehiko Kobayashi ◽  
Naoto Takahashi ◽  
Makoto Yoshikawa ◽  
Kikuo Tsunoda ◽  
Nobuyuki Tenno
Keyword(s):  
Cross Sections ◽  
Ka Band ◽  
Uwb Radar ◽  
Radar Cross Sections

Migratory Insect Multifrequency Radar Cross Sections for Morphological Parameter Estimation

2019 ◽  
Vol 57 (6) ◽  
pp. 3450-3461 ◽  
Author(s):  
Rui Wang ◽  
Cheng Hu ◽  
Changjiang Liu ◽  
Teng Long ◽  
Shaoyang Kong ◽  
...  
Keyword(s):  
Parameter Estimation ◽  
Cross Sections ◽  
Morphological Parameter ◽  
Radar Cross Sections ◽  
Multifrequency Radar

Some Effects of Vertical Wind Shear on Thunderstorm Structure *

1949 ◽  
Vol 30 (5) ◽  
pp. 168-175 ◽  
Author(s):  
Horace R. Byers ◽  
Louis J. Battan
Keyword(s):  
Cross Sections ◽  
Wind Shear ◽  
Vertical Wind Shear ◽  
Vertical Wind ◽  
Vertical Shear ◽  
Radar Cross Sections ◽  
Almost All

Observations of thunderclouds obtained with a 3-cm height-finding radar set are used to obtain a description of the vertical shear of thunderclouds. Several photographs are given which show the shearing of the radar clouds. A scattergram of wind shear plotted against echo shear is presented and shows that the two variables are related, with the former exceeding the latter in almost all cases. Scatter-diagrams are given which verify that strong vertical wind shear tends to restrict the growth of thunderstorms. A series of radar cross sections illustrates the displacement of the upper part of a thundercloud which is subjected to wind shear, and the growth of another cloud column from the lower part of the thundercloud.

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