Showing papers by "Animesh Maitra published in 2011"
TL;DR: In this paper, the variation of melting layer observed by a vertically looking Micro Rain Radar (MRR) for three years has been presented for two different climatic locations in Indian tropical region.
26 citations
TL;DR: In this paper, a power spectral analysis has been carried out to determine required cut-off frequency of filtering to separate out rain attenuation and scintillation effects, and the power spectra of low and high-pass filtered time series of satellite signal level data exhibit respective slopes in frequency domain that support theoretical values.
26 citations
20 Oct 2011
TL;DR: In this paper, a modification in the rain attenuation model taking into account the melting layer height variation with the season and rain rate was proposed, which may not be valid for tropics.
Abstract: Hydrometeors pose a serious threat to satellite communication operating above 10 GHz. The designing line of sight link usually is based on the ITU-R models, which are often inadequate for tropical region. ITU-R model uses a yearly averaged constant rain height for the attenuation calculation, which may not be valid for tropics. This paper reports the study of rain height based on Micro Rain Radar and Radiosonde observations at two tropical locations in Indian region. Results suggest a possible modification in the rain attenuation model taking into account the melting layer height variation with the season and rain rate.
12 citations
01 Dec 2011
10 citations
20 Oct 2011
TL;DR: In this article, the depolarization of a satellite signal due to scattering by rain drops has been studied at a tropical location in terms of an enhancement of cross-polar component of a horizontally polarized Ku-band signal.
Abstract: The depolarization of a satellite signal due to scattering by rain drops has been studied at a tropical location. The depolarization phenomenon is observed in terms of an enhancement of cross-polar component of a horizontally polarized Ku-band signal. The differential phase shifts, dominantly responsible for causing depolarization at Ku-band due to scattering by spheroidal raindrops, are computed by employing the point matching technique and using experimentally obtained rain drop size distribution (DSD) data. The differential phase shift is significant for large drops (> 3mm). Consequently, DSD plays an important role in determining the depolarization of the satellite signal.
4 citations
20 Oct 2011
TL;DR: In this article, the drop size distribution (DSDSD) of rain in tropical region shows the characteristic features of different types of rain, namely, stratiform, transitional and convective.
Abstract: The drop size distribution (DSD) of rain in tropical region shows the characteristic features of different types of rain, namely, stratiform, transitional and convective. This is also indicated in behaviors of the rain decay parameter, obtained from the measurements of rain rate and attenuation over an earth-space path. The DSD parameters and rain decay parameter give similar clustering indicating the feature of convective and stratiform rain. To predict rain attenuation from rain rate, the decay parameter is modeled for different rain rate regions that provides a good matching between the predicted and measured values.
3 citations
Proceedings Article•
University of Rajasthan1, Central Electronics Engineering Research Institute2, University of Calcutta3, Berhampur University4, Maharana Pratap University of Agriculture and Technology5, Jawaharlal Nehru University6, Indian Institutes of Technology7, Indian Institute of Technology Delhi8, Defence Institute of Advanced Technology9, University of Delhi10
TL;DR: An overview of the research activities currently underway in India can be found in this paper, where contributions from research organizations and education centres are separately reported followed by a brief note on the manufacturers and sources of funding for these activities.
Abstract: During past fifteen years, tremendous growth in the field of microwaves, millimeter waves and Terahertz frequency region has been realized in India. The growth of R&D activities in these areas has attracted many multinational companies to start new ventures. The research funding for these activities are mainly provided by government agencies but many industries are now supporting such activities. This paper presents an overview of the research activities currently underway in India. Contributions from research organizations and education centres are separately reported followed by a brief note on the manufacturers and sources of funding for these activities.
2 citations
01 Dec 2011
1 citations