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The new type of biosensors based on the registration of surface plasmon resonance effect using of modulation polarimetry technique is presented in this work. The developed device is capable of determining the optical refractive indexes of liquid and gaseous media with a high accuracy. Measurements of angular characteristics of the V-component of Stokes vector allow monitoring of relaxation processes...
In many THz Time Domain Spectroscopy configurations, the separate acquisition of background and sample measurements have significant impact on data quality due to the need to perform subsequent measurements as well as the change in beam coupling geometry due to the removal of the sample in the reference measurement. In this short paper, we report on the design and build of a dual-polarization TDS...
In this paper the possibility to extract information about drops vibration and deformation using the polarization characteristics of electromagnetic wave and receiving antennas are considered. The mathematical expression that demonstrates the impact of drop shape deformation and vibration onto the field reflected from liquid hydrometeor assemble and received by the antenna with arbitrary polarization...
Reverberating chambers (RC) are of interest in several applications including the Electromagnetic Compatibility (EMC). In this paper, an alternative representation of the three-dimensional state of the electromagnetic field in RC, is developed. The proposed technique can be useful in several applications in which a complete depolarization of the electromagnetic field is due. A meaningful set of experiments...
We present experimental results from the application of our new terahertz full-polarimetry instrument, to measuring the thickness of ultra-thin films in a multi-layer coating system. While the standard time-of-flight measurement is limited by the bandwidth of the THz pulse in the minimum thickness resolution of the film that can be resolved using a time-domain system, the new terahertz time-domain...
We have designed and fabricated a terahertz full-polarimetry instrument, based on control of terahertz polarization in a gas-plasma source, and fast measurement of polarization direction and chirality of the terahertz field in the time-domain without using any external polarizers. We will present details on this new experimental technique including synchronization and calibration of the measurement...
This paper considers the different atmospheric factors that influence onto liquid hydrometeors that are reflectors of electromagnetic waves. The fact of hydrometeors deformation and a further change of the polarization of sounding wave that leads to the change of frequency and energy characteristics of reflected electromagnetic signal is used in computer simulation to demonstrate the possibility to...
In this paper, a novel method for calculating virtual polarization filter is described. Interferences located in main lobe direction cause target masking. Unfortunately traditional adaptive beamformers and eigen subspace projection methods can't suppress interference signals effectively. By using sample data and scanning property of antenna, orthogonal polarization decomposition and estimation is...
A polarization analyzer is presented by polarization-mode-frequency mapping. The two orthogonal circularly polarized components of light are converted to two orbital angular momentum (OAM) modes by a q-plate, and then the OAM modes are mapping to two frequencies by using rotational Doppler Effect. The polarization of light can be retrieved by Fourier transform of the signal collected by a photodetector.
The paper reports on a new fully-polarimetric instrumentation radar operating at 228 GHz. The radar is designed to operate in FMCW mode and enjoys high angular and range resolutions and fast data acquisition.
In this paper we investigate the double bounce enhancement due to standing water in flooded agricultural fields to assess the capability of an X-band radar to recognize the presence of floodwater under vegetation. The investigation was carried out by analyzing a polarimetric and multifrequency SAR dataset (COSMO-SkyMed, Alos-2, Radarsat-2) collected over the Vercelli district in North Italy, characterized...
We show that indications of spatial dispersion effects on mineral oil slicks are observed by space-borne multipolarization synthetic aperture radar. This is readily perceived by eye when correlating multipolarization synthetic aperture radar observables with the ship track of the dispersion vessel. We investigate real full-polarimetric (linear transmit/linear receive) as well as simulated and real...
We analyzed airborne L-band Synthetic aperture radar data from the Pi-SAR-L2 platform to detect agricultural fields in semi-mountainous areas of Japan. Full-polarimetric data were acquired during the rice growing season after transplanting. We examined the usefulness of single look complex and ortho-rectified data products by attempting polarimetric decompositions for the single look complex data...
The National Aeronautics and Space Administration (NASA) in the United States and the Indian Space Research Organisation (ISRO) are developing a synthetic aperture radar (SAR) mission to map Earth's surface every 12 days, known as the NASA-ISRO SAR (NISAR) Mission. NISAR has completed its preliminary design and successfully passed its Preliminary Design Review in June 2016. This paper describes the...
AfriSAR is an ESA-funded airborne P- and L-band SAR campaign over the African tropical forests of Gabon carried out by ONERA (July 2015) and DLR (February 2016). The different acquisitions were designed in order to collect multibaseline fully polarimetric data allowing the inversion of key forest vertical structure-based parameters, like e.g. forest height and high resolution reflectivity profiles...
SAR polarimetry (PolSAR) can play an important role in change detection both in terms of improving the detection capabilities and providing physical information regarding the change. In agricultural context, such information can be used to help retrieving the phenological stage and eventually identifying stress conditions. In this work, a new change detection based on PolSAR data is proposed. The...
Speckle removal from single-channel and multi-dimensional SAR remains a difficult problem. In this paper, we are investigating the use of a Convolutional Neural Network (CNN), previously applied to the Super-Resolution problem, for speckle removal. Because speckle noise statistics is signal dependent, we are training the neural network on the residual image formed by the ratio of the observed intensity...
NASA's Soil Moisture Active Passive (SMAP) mission has been tuned to perform a Global Navigation Satellite Systems Reflectometry (GNSS-R) experiment. The motivation of this study is to assess the capabilities of GNSS-R for soil moisture determination, biomass monitoring and cryosphere studies. The use for first time of the Polarimetric Ratio (PR) from a spaceborne platform shows significant sensitivity...
The purpose of this paper is to investigate how SAR Tomography (TomoSAR) can be used to estimate ground polarimetric covariances in forest scenarios in order to increase the amount of information that can be extracted from SAR data stacks is beyond the vertical reflectivity profiles. Under the hypothesis of a two-layer model composed by ground and volume contributions, an algorithm is proposed that...
Land cover is an important earth observation parameter for understanding the Earth's ecosystem. Compared with optical sensors, Synthetic Aperture Radar (SAR) enables more rapid land cover monitoring with its all-weather, day-and-night imaging capability. We mosaicked 390 scenes of PALSAR-2 fully polarimetric data acquired in Japan and computed several polarimetric decompositions. Then, we applied...
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