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  • 1
    Online Resource
    Online Resource
    Planetary boundary layer and precipitation studies using lower atmospheric wind profiler over tropical India : PLANETARY BOUNDARY LAYER AND PRECIPITATION STUDIES
    American Geophysical Union (AGU) ; 2002
    In:  Radio Science Vol. 37, No. 4 ( 2002-08), p. 14-1-14-21
    Details
    In: Radio Science, American Geophysical Union (AGU), Vol. 37, No. 4 ( 2002-08), p. 14-1-14-21
    Type of Medium: Online Resource
    ISSN: 0048-6604
    URL: Article
    DOI: 10.1029/2000RS002538
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2002
    detail.hit.zdb_id: 2011445-X
    SSG: 16,13
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  • 2
    Online Resource
    Online Resource
    First VHF radar observations of tropical latitude E-region field aligned irregularities
    American Geophysical Union (AGU) ; 1996
    In:  Geophysical Research Letters Vol. 23, No. 25 ( 1996-12-15), p. 3683-3686
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 23, No. 25 ( 1996-12-15), p. 3683-3686
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/96GL02625
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1996
    detail.hit.zdb_id: 2021599-X
    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 3
    Online Resource
    Online Resource
    An Adaptive Moments Estimation Technique Applied to MST Radar Echoes
    American Meteorological Society ; 2005
    In:  Journal of Atmospheric and Oceanic Technology Vol. 22, No. 4 ( 2005-04-01), p. 396-408
    Details
    In: Journal of Atmospheric and Oceanic Technology, American Meteorological Society, Vol. 22, No. 4 ( 2005-04-01), p. 396-408
    Abstract: An adaptive spectral moments estimation technique has been developed for analyzing the Doppler spectra of the mesosphere–stratosphere–troposphere (MST) radar signals. The technique, implemented with the MST radar at Gadanki (13.5°N, 79°E), is based on certain criteria, set up for the Doppler window, signal-to-noise ratio (SNR), and wind shear parameters, which are used to adaptively track the signal in the range–Doppler spectral frame. Two cases of radar data, one for low and the other for high SNR conditions, have been analyzed and the results are compared with those from the conventional method based on the strongest peak detection in each range gate. The results clearly demonstrate that by using the adaptive method the height coverage can be considerably enhanced compared to the conventional method. For the low SNR case, the height coverage for the adaptive and conventional methods is about 22 and 11 km, respectively; the corresponding heights for the high SNR case are 24 and 13 km. To validate the results obtained through the adaptive method, the velocity profile is compared with global positioning system balloon sounding (GPS sonde) observations. The results of the adaptive method show excellent agreement with the GPS sonde measured wind speeds and directions throughout the height profile. To check the robustness and reliability of the adaptive algorithm, data taken over a diurnal cycle at 1-h intervals were analyzed. The results demonstrate the reliability of the algorithm in extracting wind profiles that are self-consistent in time. The adaptive method is thus found to be of considerable advantage over the conventional method in extracting information from the MST radar signal spectrum, particularly under low SNR conditions that are free from interference and ground clutter.
    Type of Medium: Online Resource
    ISSN: 1520-0426 , 0739-0572
    URL: Article
    DOI: 10.1175/JTECH1696.1
    Language: English
    Publisher: American Meteorological Society
    Publication Date: 2005
    detail.hit.zdb_id: 2021720-1
    detail.hit.zdb_id: 48441-6
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  • 4
    Online Resource
    Online Resource
    Technical Details of a Novel Wind Profiler Radar at 205 MHz
    American Meteorological Society ; 2017
    In:  Journal of Atmospheric and Oceanic Technology Vol. 34, No. 12 ( 2017-12), p. 2659-2671
    Details
    In: Journal of Atmospheric and Oceanic Technology, American Meteorological Society, Vol. 34, No. 12 ( 2017-12), p. 2659-2671
    Abstract: The Cochin University of Science and Technology (CUSAT), Cochin, India, hosts the world’s first 205-MHz stratosphere–troposphere (ST) wind profiler radar. This radar constitutes 619 three-element Yagi–Uda antennas with a power aperture product of 1.6 × 10 8 Wm 2 and is capable of providing accurate three-dimensional wind profiles for an altitude range of 315 m–20 km. The system description and its first time validation and results from some of the radar’s potential applications are being presented. The radar wind profiles have been validated against collocated GPS–radiosonde measurements during the summer monsoon of 2016. The radar and radiosonde profiles show very good correlation with coefficients of 0.99 and 0.93 for zonal and meridional winds, respectively. The standard deviation of the radar measurements with respect to radiosonde measurements is found to be 1.85 m s −1 for zonal wind and 1.66 m s −1 for meridional wind. Moreover, the radar also detects echoes from the ionosphere. The ST radar at Cochin (10.04°N, 76.33°E; 40 m MSL) is an ideal observational facility, located in the tropics, for understanding the processes of the Indian summer monsoon at the region of its onset, which is expected to enhance science’s knowledge of monsoon dynamics.
    Type of Medium: Online Resource
    ISSN: 0739-0572 , 1520-0426
    URL: Article
    DOI: 10.1175/JTECH-D-17-0051.1
    Language: Unknown
    Publisher: American Meteorological Society
    Publication Date: 2017
    detail.hit.zdb_id: 2021720-1
    detail.hit.zdb_id: 48441-6
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  • 5
    Online Resource
    Online Resource
    Indian MST radar 2. First scientific results in ST mode
    American Geophysical Union (AGU) ; 1995
    In:  Radio Science Vol. 30, No. 4 ( 1995-07), p. 1139-1158
    Details
    In: Radio Science, American Geophysical Union (AGU), Vol. 30, No. 4 ( 1995-07), p. 1139-1158
    Abstract: Clear air radars operating in the VHF range provide excellent information on middle atmospheric structure and dynamics with fine height and time resolutions. One such radar is installed at Gadanki, a tropical station in India. Experiments were carried out using the ST mode of this newly established MST radar to study the atmospheric wind field, characteristics of atmospheric stable layers, and clear air turbulence over this tropical station. Atmospheric stable layers are observed at various heights in the troposphere and lower stratosphere. Multilayer structures are observed near the tropopause and in the lower stratosphere. The range‐time‐intensity (RTI) maps for the zenith beam show that once these structures are formed, they are seen to last for more than an hour, indicating their large horizontal extent. The model computations of radar signal‐to‐noise ratio (SNR) for zenith beam, using simultaneous radiosonde observations taken at Madras, show a gross agreement with the observed SNR. However, the model SNR profiles do not show the fine structure observed by the radar, the limitation of the model profiles being the lower height resolution of the radiosonde measurements. The refractivity turbulence structure constant C 2 n is determined using SNR for 20° off‐zenith beams pointed in east, west, north, and south directions. Profiles of C 2 n for the four oblique beams are found to agree within 10 dB, indicating that the intensity of the turbulence for the same range bin, within the volume scanned by the radar, is the same. The parameter C 2 n is also computed using meteorological parameters and compared with radar C 2 n . The observed and model C 2 n profiles are found to agree within 5 dB. Radar C 2 n profiles are found to show large diurnal and day‐to‐day variability. The results of an experiment conducted to determine the effect of transmitted pulse length on the received signal spectral width show that the wind shear effect is important for oblique beams and for longer pulse lengths, where as the beam‐broadening effect is important for both oblique and vertical beams for all pulse lengths. Various turbulence parameters are determined using the observed spectral width after correcting for these effects.
    Type of Medium: Online Resource
    ISSN: 0048-6604 , 1944-799X
    URL: Article
    DOI: 10.1029/95RS00652
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1995
    detail.hit.zdb_id: 2011445-X
    SSG: 16,13
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  • 6
    Online Resource
    Online Resource
    Evidence of intermediate layer characteristics in the Gadanki radar observations of the upper E region field-aligned irregularities : INTERMEDIATE LAYER CHARACTERISTICS IN UPPER E REGION IRREGULARITIES
    American Geophysical Union (AGU) ; 2002
    In:  Geophysical Research Letters Vol. 29, No. 14 ( 2002-07), p. 41-1-41-4
    Details
    In: Geophysical Research Letters, American Geophysical Union (AGU), Vol. 29, No. 14 ( 2002-07), p. 41-1-41-4
    Type of Medium: Online Resource
    ISSN: 0094-8276
    URL: Article
    DOI: 10.1029/2001GL013773
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 2002
    detail.hit.zdb_id: 2021599-X
    detail.hit.zdb_id: 7403-2
    SSG: 16,13
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  • 7
    Online Resource
    Online Resource
    First observations of equatorial spread F from Indian MST radar
    American Geophysical Union (AGU) ; 1995
    In:  Radio Science Vol. 30, No. 4 ( 1995-07), p. 1159-1165
    Details
    In: Radio Science, American Geophysical Union (AGU), Vol. 30, No. 4 ( 1995-07), p. 1159-1165
    Abstract: The newly established MST radar at Gadanki (13.5°N, 79.2°E) was operated on a few occasions in ionospheric field‐aligned backscatter mode to investigate the small‐scale (∼ 3 m) irregularities associated with the equatorial spread F . Observations are presented of sample Doppler spectra and height‐time variations of signal intensity and weighted mean Doppler velocity. The Doppler spectra are mostly of the composite type similar to that observed at Jicamarca and are quite variable both in height and time. The Doppler velocities of the 3‐m irregularities are found to be consistent in general with the slopes observed of the scattering structures in the height‐time‐intensity plots. The peak signal intensities are found to be as high as 40 dB above the mean noise level, and the peak Doppler velocities are around 70 m s −1 .
    Type of Medium: Online Resource
    ISSN: 0048-6604 , 1944-799X
    URL: Article
    DOI: 10.1029/95RS00650
    Language: English
    Publisher: American Geophysical Union (AGU)
    Publication Date: 1995
    detail.hit.zdb_id: 2011445-X
    SSG: 16,13
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