Results 181 to 190 of about 630,501 (231)

Polarimetric FMCW weather radar

2015 23nd Signal Processing and Communications Applications Conference (SIU), 2015
This study which was conducted as a Master's thesis, is a radar system working at X band. In this system, a 2 Watt continuous electromagnetic wave which is modulated with frequency ramp of 30 MHz bandwidth is generated and radiated through TX antenna. The scattered signal from the hydrometeors is multiplied with the transmitted one and beat signal is ...
Salih Coskun, Ali Özgür Yilmaz, S. Sencer Koç, Mert Celik   +3 more
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Polarimetric Radar for Accurate Navigation

Canadian Journal of Electrical and Computer Engineering, 1987
A novel and commercially viable solution to the problem of blind navigation of a ship along a confined waterway is described. The solution is based on the use of radar polarimetry. At the heart of the system is a patented passive (nonpowered) retrodirective reflector that is capable of rotating the incident polarization through 90°.
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Calibration of bistatic polarimetric radar systems

IEEE Transactions on Geoscience and Remote Sensing, 1992
A calibration technique for laboratory type polarimetric, bistatic instrumentation radars is presented. It describes the errors induced by the standard radiation transfer approach (I-SRT) in a way similar to that for the monostatic case. A 12-term error correction and absolute polarimetric calibration is performed with two external reference targets ...
Kaehny, Daniel, Schmitt, Klaus, Wiesbeck, Werner   +2 more
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Polarimetric borehole radar

54th EAEG Meeting, 1992
Directional borehole radars have good potential (or 3-D determination of water-filled fractures and geological boundaries. The choice of polarization of electromagnetic wave used for measurements are quite significant in designing radar systems. Circular polarization has advantages for Ground penetrating radars (GPR), because the reflection efficiency ...
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Polarimetric laser radar target classification

Optics Letters, 2005
Imaging laser radar (ladar) systems have been developed for automatic target identification in surveillance systems. Ladar uses the range value at the target pixels to estimate the target's 3-D shape and identify the target. For targets in clutter and partially hidden targets, there are ambiguities in determining which pixels are on target that lead to
Cornell S L, Chun, Firooz A, Sadjadi
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Polarimetric Doppler Radar

2019
Basic principles of a polarimetric Doppler radar are described in this chapter. These include formation of the transmitted EM wave by a pulsed radar, reception of the radar signal reflected from a single scatterer, and its transformation in the antenna, microwave assembly, and two receivers for orthogonally polarized components of the backscattered EM ...
Alexander V. Ryzhkov, Dusan S. Zrnic
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MEMPHIS-a fully polarimetric experimental radar

IEEE International Geoscience and Remote Sensing Symposium, 2003
The MEMPHIS polarimetric SAR is able to operate simultaneously at X-, Kaand W-band. After a detailed technical description, several examples are given to demonstrate its capabilities in the side-looking mode, in forward squinted Doppler beam sharpenung (DBS) mode and with across-track interferometry.
Hartmut Schimpf, Helmut Essen, Stephan Boehmsdorff, Thorsten Brehm   +3 more
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Polarimetric borehole radar and its applications

IEEE International Geoscience and Remote Sensing Symposium, 2003
We introduce applications of radar polarimetry in borehole radar. One example is classification of subsurface fractures, where we estimate the water permeability of each fracture by radar polarimetry. Then polarimetric borehole radar was then used for cross-hole radar measurement.
Motoyuki Sato, Tomohiro Abe
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Polarimetric synthetic aperture radar imaging

International Journal of Imaging Systems and Technology, 1992
AbstractMIT Lincoln Laboratory in investigating the detection and identification of stationary ground targets in high resolution, fully polarimetric, synthetic aperture radar (SAR) imagery. This article (1) provides a brief description of the Lincoln Laboratory SAR, (2) describes an optimum polarimetric processing technique used to construct minimum ...
Leslie M. Novak, Christine M. Netishen
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Sparse modeling for polarimetric radar

2011 IEEE Statistical Signal Processing Workshop (SSP), 2011
In this paper, we develop a sparse model to represent the data recorded by a polarimetric, coherent radar. We produce this model defining an over-complete library of possible target responses in the range-polarization space. Then, we employ compressive sensing methods to infer the position and the scattering matrix of the target. Using real radar data,
M. Hurtado, N. von Ellenrieder, C. Muravchik, A. Nehorai   +3 more
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