Pub Date : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712799
H. Albert, C. Alosious Gonsago, N. Victor Jaya, M. Muralidhar
The effect of high pressure and high temperature on electrical resistivity behavior of (Nd, Eu, Gd) Ba-Cu-O superconductor with 10wt %Ag2O addition was studied. This high Tc superconductor was synthesized using the oxygen controlled melt growth process(OCMG). At room temperature, there was an initial drop in the resistivity of the superconductor up to 3GPa, followed by a nearly constant value up to 8GPa pressure. The steady value of resistivity observed between 3 and 8GPa decreased with increasing Ag2O content. The superconducting composite formed exhibited a metallic nature under pressure up to 8GPa.
{"title":"Effect of high pressure and high temperature on (Nd, Eu, Gd) Ba-Cu-O superconductor","authors":"H. Albert, C. Alosious Gonsago, N. Victor Jaya, M. Muralidhar","doi":"10.1109/RSTSCC.2010.5712799","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712799","url":null,"abstract":"The effect of high pressure and high temperature on electrical resistivity behavior of (Nd, Eu, Gd) Ba-Cu-O superconductor with 10wt %Ag2O addition was studied. This high Tc superconductor was synthesized using the oxygen controlled melt growth process(OCMG). At room temperature, there was an initial drop in the resistivity of the superconductor up to 3GPa, followed by a nearly constant value up to 8GPa pressure. The steady value of resistivity observed between 3 and 8GPa decreased with increasing Ag2O content. The superconducting composite formed exhibited a metallic nature under pressure up to 8GPa.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116184227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712889
L. R. Akshaya Deepa, N. Praveen
India is now put into the pressure of reducing the emission GHG (Green House Gases) into the atmosphere due to its climatic change. The responsibility of the reduction of the greenhouse gas emissions lies largely with the industrialized world, though the developing countries are likely to be the source of an increasing proportion of future emissions. The projected climate change under various scenarios is likely to have implications on food production, water supply, coastal settlements, forest ecosystems, health, energy security etc. The survey says that the global mean temperature may increase between 1.4 and 5.8 degrees Celsius (C) by 2100. This unprecedented increase is expected to have severe impacts on the global hydrological system, ecosystems, sea level, crop production and related processes. The impact would be particularly severe in the tropical areas, which mainly consist of developing countries, including India. The impact of the GHG emission on the Climate Change is now worsening than we imagined a decade ago. India being the Developing country was not able to adopt any strategy because it is more concerned to the social economic development. The most effective way is to adopt a sustainable development pathway by shifting to the environmentally sustainable technologies and promotion of water conservation, renewable energy, forest conservation and energy efficiency. It's the responsibility of the Indian Scientists to bring up various sustainable methods and technologies which will be accepted environmentally and globally too. Other than talking about socio economic growth, concentration must be dissipated to the introduction of the green technology into the development of the sustainable technologies for the prevailing problem of the Climate change impact.
{"title":"Impact of Climate change and adaptation to green technology in India","authors":"L. R. Akshaya Deepa, N. Praveen","doi":"10.1109/RSTSCC.2010.5712889","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712889","url":null,"abstract":"India is now put into the pressure of reducing the emission GHG (Green House Gases) into the atmosphere due to its climatic change. The responsibility of the reduction of the greenhouse gas emissions lies largely with the industrialized world, though the developing countries are likely to be the source of an increasing proportion of future emissions. The projected climate change under various scenarios is likely to have implications on food production, water supply, coastal settlements, forest ecosystems, health, energy security etc. The survey says that the global mean temperature may increase between 1.4 and 5.8 degrees Celsius (C) by 2100. This unprecedented increase is expected to have severe impacts on the global hydrological system, ecosystems, sea level, crop production and related processes. The impact would be particularly severe in the tropical areas, which mainly consist of developing countries, including India. The impact of the GHG emission on the Climate Change is now worsening than we imagined a decade ago. India being the Developing country was not able to adopt any strategy because it is more concerned to the social economic development. The most effective way is to adopt a sustainable development pathway by shifting to the environmentally sustainable technologies and promotion of water conservation, renewable energy, forest conservation and energy efficiency. It's the responsibility of the Indian Scientists to bring up various sustainable methods and technologies which will be accepted environmentally and globally too. Other than talking about socio economic growth, concentration must be dissipated to the introduction of the green technology into the development of the sustainable technologies for the prevailing problem of the Climate change impact.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128017222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712854
J. Wilson Sahayaraj, S. Rajendran, J. Amalraj
An eco-friendly inhibitor L-valine (LV) in controlling corrosion of carbon steel in rain water in the absence and presence of Zn2+ has been evaluated by mass loss method. The formulation consisting of 50 ppm of L-valine and 50 ppm of Zn2+ offers good inhibition efficiency of 74%. When 50 ppm of sodium gluconate (SG) is added to the formulations consisting of 50 ppm of LV and 50 ppm of Zn2+, the inhibition efficiency increases from 74% to 98%. As the immersion period increases, the inhibition efficiency does not alter. Polarization study reveals that this formulation functions as a mixed inhibitor. AC impedance spectra reveal the presence of a protective film on the metal surface. The FTIR spectra study lead to the conclusion that the Fe2+ - LV complex and Fe2+ - SG complex formed on anodic sites of the metal surface controlled the anodic reaction and Zn(OH)2 formed on the cathodic sites of the metal surface controlling the cathodic reaction. The Ecofriendly inhibitor L-valine - Zn2+-SG system may find in cooling water system
{"title":"Eco-friendly inhibitor L-valine - Zn2+-SG system controlling the corrosion of carbon steel in rain water","authors":"J. Wilson Sahayaraj, S. Rajendran, J. Amalraj","doi":"10.1109/RSTSCC.2010.5712854","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712854","url":null,"abstract":"An eco-friendly inhibitor L-valine (LV) in controlling corrosion of carbon steel in rain water in the absence and presence of Zn2+ has been evaluated by mass loss method. The formulation consisting of 50 ppm of L-valine and 50 ppm of Zn2+ offers good inhibition efficiency of 74%. When 50 ppm of sodium gluconate (SG) is added to the formulations consisting of 50 ppm of LV and 50 ppm of Zn2+, the inhibition efficiency increases from 74% to 98%. As the immersion period increases, the inhibition efficiency does not alter. Polarization study reveals that this formulation functions as a mixed inhibitor. AC impedance spectra reveal the presence of a protective film on the metal surface. The FTIR spectra study lead to the conclusion that the Fe2+ - LV complex and Fe2+ - SG complex formed on anodic sites of the metal surface controlled the anodic reaction and Zn(OH)2 formed on the cathodic sites of the metal surface controlling the cathodic reaction. The Ecofriendly inhibitor L-valine - Zn2+-SG system may find in cooling water system","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131315918","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712839
V. Sridevi, T. Jayanthy
Carbon Nano Tube (CNT) is one of the several cutting edge emerging technologies within Nano technology, that is showing high efficiency and very wide range of applications in many different streams of science and technology. The Carbon Nano Tube Field Effect Transistors (CNTFETs) have been explored and proposed to be the promising candidate for the next generation of integrated circuit (IC) devices. To explore the role of CNTFETs in future integrated circuits, it is important to evaluate their performance. However, to do that we need a model that can accurately describe the behavior of the CNTFETs so that the design and evaluation of circuits using these devices can be made. This paper focuses on compact modeling of CNTFET and analysis of the performance of the developed model using various characteristics.
{"title":"Unipolar characteristics of Carbon Nanotube Field Effect Transistor","authors":"V. Sridevi, T. Jayanthy","doi":"10.1109/RSTSCC.2010.5712839","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712839","url":null,"abstract":"Carbon Nano Tube (CNT) is one of the several cutting edge emerging technologies within Nano technology, that is showing high efficiency and very wide range of applications in many different streams of science and technology. The Carbon Nano Tube Field Effect Transistors (CNTFETs) have been explored and proposed to be the promising candidate for the next generation of integrated circuit (IC) devices. To explore the role of CNTFETs in future integrated circuits, it is important to evaluate their performance. However, to do that we need a model that can accurately describe the behavior of the CNTFETs so that the design and evaluation of circuits using these devices can be made. This paper focuses on compact modeling of CNTFET and analysis of the performance of the developed model using various characteristics.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128688930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712808
John Blesswin, V Rema, J. Joselin
Security has become an inseparable issue even in the field of space technology. Visual Cryptography is the study of mathematical techniques related aspects of Information Security which allows Visual information to be encrypted in such a way that their decryption can be performed by the human visual system, without any complex cryptographic algorithms. This technique represents the secret image by several different shares of binary images. It is hard to perceive any clues about a secret image from individual shares. The secret message is revealed when parts or all of these shares are aligned and stacked together. In this paper we provide an overview of the emerging Visual Cryptography (VC) techniques used in the secure transfer of the thousands of images collected by the satellite which are stored in image library and sent to Google for use on Google Earth and Google maps. The related work is based on the recovering of secret image using a binary logo which is used to represent the ownership of the host image which generate shadows by visual cryptography algorithms. An error correction-coding scheme is also used to create the appropriate shadow. The logo extracted from the half-toned host image identifies the cheating types. Furthermore, the logo recovers the reconstructed image when shadow is being cheated using an image self-verification scheme based on the Rehash technique which rehash the halftone logo for effective self verification of the reconstructed secret image without the need for the trusted third party(TTP).
{"title":"Effective recovery technique for halftone images in Visual Cryptography","authors":"John Blesswin, V Rema, J. Joselin","doi":"10.1109/RSTSCC.2010.5712808","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712808","url":null,"abstract":"Security has become an inseparable issue even in the field of space technology. Visual Cryptography is the study of mathematical techniques related aspects of Information Security which allows Visual information to be encrypted in such a way that their decryption can be performed by the human visual system, without any complex cryptographic algorithms. This technique represents the secret image by several different shares of binary images. It is hard to perceive any clues about a secret image from individual shares. The secret message is revealed when parts or all of these shares are aligned and stacked together. In this paper we provide an overview of the emerging Visual Cryptography (VC) techniques used in the secure transfer of the thousands of images collected by the satellite which are stored in image library and sent to Google for use on Google Earth and Google maps. The related work is based on the recovering of secret image using a binary logo which is used to represent the ownership of the host image which generate shadows by visual cryptography algorithms. An error correction-coding scheme is also used to create the appropriate shadow. The logo extracted from the half-toned host image identifies the cheating types. Furthermore, the logo recovers the reconstructed image when shadow is being cheated using an image self-verification scheme based on the Rehash technique which rehash the halftone logo for effective self verification of the reconstructed secret image without the need for the trusted third party(TTP).","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115959561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712795
R. Samuel Selvaraj, V. Sivamadhavi
Global warming is due to many factors such as the variation in the incoming solar radiation, earth's magnetic field, atmospheric conditions such as cloud formation, aerosol content, Green House Effect, etc. In the present study, the contribution of Green House Effect is being explored. First, a theoretical estimate of Green House Effect is presented with a verification using the observed values. Then, the contribution of the Green House Gases based on its concentration is calculated. Of the various Green House Gases, we have taken Carbon di oxide, Methane, Nitrous oxide, Chloro Fluoro Carbon-11 & 12 for our study. Of these gases, the contribution of carbon di oxide alone is found to be about 66% of the total magnitude of the Green House Effect.
{"title":"Magnitude of Green House Effect and the contribution of Carbon di oxide","authors":"R. Samuel Selvaraj, V. Sivamadhavi","doi":"10.1109/RSTSCC.2010.5712795","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712795","url":null,"abstract":"Global warming is due to many factors such as the variation in the incoming solar radiation, earth's magnetic field, atmospheric conditions such as cloud formation, aerosol content, Green House Effect, etc. In the present study, the contribution of Green House Effect is being explored. First, a theoretical estimate of Green House Effect is presented with a verification using the observed values. Then, the contribution of the Green House Gases based on its concentration is calculated. Of the various Green House Gases, we have taken Carbon di oxide, Methane, Nitrous oxide, Chloro Fluoro Carbon-11 & 12 for our study. Of these gases, the contribution of carbon di oxide alone is found to be about 66% of the total magnitude of the Green House Effect.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121325456","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712877
B. Vijayalakshmi, M. R. E. Jebarani, S. Nisha
The temperature of earth intact is determined by the set of scales between incoming and outgoing energy. Climate changes happen largely from changes to the earth's heat equilibrium. Many factors that manipulated by natural processes and human-made processes. The main factors influencing climate change are extraterrestrial factors, volcanism, earth's surface reflectivity and atmospheric factors. It is the impacts from anthropogenic processes, through the enhanced greenhouse effect, which are likely to be causing contemporary climate change. This in turn could bring about considerable environmental, social and economic disruption if adequate alleviation and variation measures are not implemented. The effectiveness of climate change due to green house effect can be reduced by reducing the surface reflectivity. For this an embedded earth reflection observer is designed. The system is inclusive of flimsy reflection observer, oriented rigidly to a predefined optimized observation angle. It observes the maximum level of transmitted heat from the earth and avoids the effectiveness of climate to shift from its natural state. The designed system maintains the environment temperature not greater than 32° centigrade with ±0.4% of error for a selected sample region during midday irrespective of the day conditions.
{"title":"Prevention from dynamic issues owing to surface reflection persuade the climate change","authors":"B. Vijayalakshmi, M. R. E. Jebarani, S. Nisha","doi":"10.1109/RSTSCC.2010.5712877","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712877","url":null,"abstract":"The temperature of earth intact is determined by the set of scales between incoming and outgoing energy. Climate changes happen largely from changes to the earth's heat equilibrium. Many factors that manipulated by natural processes and human-made processes. The main factors influencing climate change are extraterrestrial factors, volcanism, earth's surface reflectivity and atmospheric factors. It is the impacts from anthropogenic processes, through the enhanced greenhouse effect, which are likely to be causing contemporary climate change. This in turn could bring about considerable environmental, social and economic disruption if adequate alleviation and variation measures are not implemented. The effectiveness of climate change due to green house effect can be reduced by reducing the surface reflectivity. For this an embedded earth reflection observer is designed. The system is inclusive of flimsy reflection observer, oriented rigidly to a predefined optimized observation angle. It observes the maximum level of transmitted heat from the earth and avoids the effectiveness of climate to shift from its natural state. The designed system maintains the environment temperature not greater than 32° centigrade with ±0.4% of error for a selected sample region during midday irrespective of the day conditions.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122348814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712834
V. Sivachidambaranathan, S. Dash
This paper presents the simulation of Half Bridge Series Resonant Power Factor Correction (PFC) DC - DC converter with high frequency transformer isolation using Matlab Simulink. Resonant converters have no switching loss and are more suitable for high frequency operations. The switches in resonant converters turn on and off under zero current and/or zero voltage and there is no switching loss.This converter uses a gating scheme suitable for integrating buck converter and PWM DC to DC converter using a single control. A model for DC - DC Half bridge Series Resonant PFC converter has been developed and the MATLAB simulation results for the converter are presented.
本文利用Matlab Simulink对高频变压器隔离的半桥串联谐振功率因数校正(PFC) DC - DC变换器进行仿真。谐振变换器没有开关损耗，更适合于高频工作。谐振变换器中的开关在零电流和/或零电压下接通和关闭，并且没有开关损耗。该变换器采用门控方案，适用于buck变换器和PWM DC到DC变换器的集成。建立了直流-直流半桥串联谐振PFC变换器的模型，并给出了该变换器的MATLAB仿真结果。
{"title":"Simulation of Half Bridge Series Resonant PFC DC to DC converter","authors":"V. Sivachidambaranathan, S. Dash","doi":"10.1109/RSTSCC.2010.5712834","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712834","url":null,"abstract":"This paper presents the simulation of Half Bridge Series Resonant Power Factor Correction (PFC) DC - DC converter with high frequency transformer isolation using Matlab Simulink. Resonant converters have no switching loss and are more suitable for high frequency operations. The switches in resonant converters turn on and off under zero current and/or zero voltage and there is no switching loss.This converter uses a gating scheme suitable for integrating buck converter and PWM DC to DC converter using a single control. A model for DC - DC Half bridge Series Resonant PFC converter has been developed and the MATLAB simulation results for the converter are presented.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127049364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712812
R. Vasantharaj, D. Sureshbabu, D. Kumar
This paper describes the progress of an advanced pulsed plasma thruster (PPT).The PPT currently being developed for flight which represents a significant leap in technology compared to previous flight models. The PPT will be used to extend satellite life from about 1–3 months to over one year by raising it's operational orbit. The PPT is an ideal propulsion system for extending the small satellite life because of it's high specific impulse (>1000 sec), low system wet mass (<5 kg), and inert nature when not powered (thus minimizing shuttle integration issues). In addition to the life enhancement mission, the on-orbit operations have been specifically designed to rigorously test the PPT ant to demonstrate it's compatibility with the satellites spacecraft in order to validate it for commercial satellites.
{"title":"Advanced pulsed plasma thruster for satellites orbit control","authors":"R. Vasantharaj, D. Sureshbabu, D. Kumar","doi":"10.1109/RSTSCC.2010.5712812","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712812","url":null,"abstract":"This paper describes the progress of an advanced pulsed plasma thruster (PPT).The PPT currently being developed for flight which represents a significant leap in technology compared to previous flight models. The PPT will be used to extend satellite life from about 1–3 months to over one year by raising it's operational orbit. The PPT is an ideal propulsion system for extending the small satellite life because of it's high specific impulse (>1000 sec), low system wet mass (<5 kg), and inert nature when not powered (thus minimizing shuttle integration issues). In addition to the life enhancement mission, the on-orbit operations have been specifically designed to rigorously test the PPT ant to demonstrate it's compatibility with the satellites spacecraft in order to validate it for commercial satellites.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126611981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-11-01DOI: 10.1109/RSTSCC.2010.5712816
J. Jena, P. Sahu
The Ka-band (20–30 GHz) frequency spectrum has recently gained attention for satellite communication. High Definition Television (HDTV), which needs a much larger bandwidth for transmission, coupled with the current demand for hundreds of television channels and the growth in Internet communications through Direct-To-Home (DTH), is resulting in a communications bandwidth shortage. One tool being used to address this problem is Satellite Spot-Beams. To design effective satellite communication system operation at extremely high frequency band (Ka and higher bands), the effect of meteorology is important compared to Ku-band frequencies. Keeping view of the socio-economic and geographic diversities of India, Propagation studies are essential for estimation of attenuation, so that Ka-band satellite links operating in different parts of Indian region can be registered appropriately. This paper analyzes Ka-band satellite communications link availability in various geographical separated spot beams in India using statistical data. This paper proposes 16 spot-beam locations to cover Indian main land. It is based on global rain models integrated with the link budget. The global Crane model and ITU-DAH rain model allow us to examine major system design issues encountered in Ka-band satellite communications that are susceptible to propagation impairments. This system is flexible enough to increase power on specific transmissions when needed to compensate for local weather conditions.
{"title":"Rain fade and Ka-band Spot Beam Satellite communication in India","authors":"J. Jena, P. Sahu","doi":"10.1109/RSTSCC.2010.5712816","DOIUrl":"https://doi.org/10.1109/RSTSCC.2010.5712816","url":null,"abstract":"The Ka-band (20–30 GHz) frequency spectrum has recently gained attention for satellite communication. High Definition Television (HDTV), which needs a much larger bandwidth for transmission, coupled with the current demand for hundreds of television channels and the growth in Internet communications through Direct-To-Home (DTH), is resulting in a communications bandwidth shortage. One tool being used to address this problem is Satellite Spot-Beams. To design effective satellite communication system operation at extremely high frequency band (Ka and higher bands), the effect of meteorology is important compared to Ku-band frequencies. Keeping view of the socio-economic and geographic diversities of India, Propagation studies are essential for estimation of attenuation, so that Ka-band satellite links operating in different parts of Indian region can be registered appropriately. This paper analyzes Ka-band satellite communications link availability in various geographical separated spot beams in India using statistical data. This paper proposes 16 spot-beam locations to cover Indian main land. It is based on global rain models integrated with the link budget. The global Crane model and ITU-DAH rain model allow us to examine major system design issues encountered in Ka-band satellite communications that are susceptible to propagation impairments. This system is flexible enough to increase power on specific transmissions when needed to compensate for local weather conditions.","PeriodicalId":254761,"journal":{"name":"Recent Advances in Space Technology Services and Climate Change 2010 (RSTS & CC-2010)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114926172","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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