The Experts below are selected from a list of 204 Experts worldwide ranked by ideXlab platform
E. I. Torgushin - One of the best experts on this subject based on the ideXlab platform.
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Woodward constant with space-distance resolution in Radar Scanning system
Signal Processing, 1998Co-Authors: A. D. Pluzhnikov, E. N. Pribludova, E. I. TorgushinAbstract:Abstract It is shown that an increased Scanning rate permits to transform the target range differences into the spatial differences of echo signals (the aperture phase-distribution differences). This provides the spatial resolution of the signals (in particular, with the equality of angular coordinates of the echo reflectors) and the spatial suppression of clutter. As a consequence, the Scanning Radar antenna is an instrument of a selection of echoes from target with intended range and an instrument of a suppression of intensive close clutter. The obtained result is useful to a case of continuous or quasi-continuous transmitted signal.
A. D. Pluzhnikov - One of the best experts on this subject based on the ideXlab platform.
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Resolution of space-time signals of high repetition frequency in angular-coordinate Radar Scanning
Radio and communications technology, 2000Co-Authors: A. D. Pluzhnikov, E. N. PribludovaAbstract:In investigating target selection in the presence of clutter, it is of interest to analyze the influence of the Scanning rate on the space-time structure of signals generalized by a multidimensional correlation function and the quality of resolution at a high pulse-repetition frequency. The possibility of spatial resolution of objects in terms of the range by range-angular conversion in accelerated Scanning is established.
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Woodward constant with space-distance resolution in Radar Scanning system
Signal Processing, 1998Co-Authors: A. D. Pluzhnikov, E. N. Pribludova, E. I. TorgushinAbstract:Abstract It is shown that an increased Scanning rate permits to transform the target range differences into the spatial differences of echo signals (the aperture phase-distribution differences). This provides the spatial resolution of the signals (in particular, with the equality of angular coordinates of the echo reflectors) and the spatial suppression of clutter. As a consequence, the Scanning Radar antenna is an instrument of a selection of echoes from target with intended range and an instrument of a suppression of intensive close clutter. The obtained result is useful to a case of continuous or quasi-continuous transmitted signal.
Jens J. Krüger - One of the best experts on this subject based on the ideXlab platform.
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Radar Scanning the world production frontier
Journal of Productivity Analysis, 2016Co-Authors: Jens J. KrügerAbstract:In this paper we report the results from a detailed investigation of the shifts of the world production frontier function over the period 1980–2010. Analogous to a Radar we implement a novel measurement approach for these shifts using nonparametrically computed directional distance functions to scan the frontier shifts across the entire input–output space. The shifts of the frontier function measured in this way are analyzed by regression methods. The results point towards substantial non-neutrality of technological progress and furthermore show that technological progress is more pronounced in regions of high output and in regions where human capital is intensely used.
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Radar Scanning the World Production Frontier
Journal of Productivity Analysis, 2015Co-Authors: Jens J. KrügerAbstract:In this paper we report the results from a detailed investigation of the shifts of the world production frontier function over the period 1980-2010. Analogous to a Radar we implement a novel measurement approach for these shifts using nonparametrically computed productivity measures to scan the frontier shifts across the entire input-output space. The shifts of the frontier function measured in this way are analyzed by various regression methods (including robust and nonparametric). The results point towards substantial non-neutrality of technological progress and furthermore show that technological progress is more pronounced in regions of high output per worker and in regions where physical and human capital are intensely used.
E. N. Pribludova - One of the best experts on this subject based on the ideXlab platform.
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Resolution of space-time signals of high repetition frequency in angular-coordinate Radar Scanning
Radio and communications technology, 2000Co-Authors: A. D. Pluzhnikov, E. N. PribludovaAbstract:In investigating target selection in the presence of clutter, it is of interest to analyze the influence of the Scanning rate on the space-time structure of signals generalized by a multidimensional correlation function and the quality of resolution at a high pulse-repetition frequency. The possibility of spatial resolution of objects in terms of the range by range-angular conversion in accelerated Scanning is established.
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Woodward constant with space-distance resolution in Radar Scanning system
Signal Processing, 1998Co-Authors: A. D. Pluzhnikov, E. N. Pribludova, E. I. TorgushinAbstract:Abstract It is shown that an increased Scanning rate permits to transform the target range differences into the spatial differences of echo signals (the aperture phase-distribution differences). This provides the spatial resolution of the signals (in particular, with the equality of angular coordinates of the echo reflectors) and the spatial suppression of clutter. As a consequence, the Scanning Radar antenna is an instrument of a selection of echoes from target with intended range and an instrument of a suppression of intensive close clutter. The obtained result is useful to a case of continuous or quasi-continuous transmitted signal.
V. Chandrasekar - One of the best experts on this subject based on the ideXlab platform.
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Spectral processing of SEAPOL weather Radar observations
2019 IEEE MTT-S International Microwave and RF Conference (IMARC), 2019Co-Authors: V. ChandrasekarAbstract:In this paper, a spectral domain signal processing technique is demonstrated to filter out sea clutter from data of ship-borne weather Radar. A procedure is shown for correcting the velocity errors in the spectrographs that is due to ship's motion during Radar Scanning. A novel thresholding criterion named as spectral signal quality index (SSQI) is developed to suppress noise and unwanted interference in the spectral domain processing. It is shown that the application of SSQI based thresholding leads to a better discrimination of weather signals against noise and sea clutter. This technique is demonstrated using data from SEAPOL a C-band shipborne dual polarimetric weather Radar to effectively remove sea clutter.
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multiparameter Radar and in situ aircraft observation of graupel and hail
IEEE Transactions on Geoscience and Remote Sensing, 2000Co-Authors: A Elmagd, V. Chandrasekar, V N Bringi, W StrappAbstract:Documenting simultaneous multiparameter Radar observations of precipitation in conjunction with in situ hydrometeor sampling is important for the interpretation of multiparameter Radar observations. In situ observation using aircraft-mounted probes is one of the best ways to collect such data. In situ observation of hail and graupel in convective storms is complicated due to adverse environment of flight and low concentration of large particles that are difficult to sample. This paper presents one of the first observations of simultaneous multiparameter Radar observations and in situ samples of wet hail and graupel in convective storms. The observations are unique because of the excellent coordination between aircraft samples and Radar Scanning, as well as relatively large sample volumes of aircraft data. Multiparameter Radar observations (namely reflectivity, differential reflectivity, linear depolarization ratio, copolar correlation coefficient, and specific differential phase) are documented in graupel and wet hail. The observations indicate that the linear depolarization ratio and copolar correlation measurements, in conjunction with reflectivity levels, can be used to distinguish between graupel and hail. A simple procedure is developed to estimate the average bulk density of graupel and wet hail, comparing Radar and in situ observations.
