Please wait, while we are loading the content...
Please wait, while we are loading the content...
| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Dubin, A.P. Riley, P.B. Herman, D.E. Clifton, R.S. |
| Copyright Year | 1995 |
| Description | Author affiliation: Aerosp. Corp., El Segundo, CA, USA (Dubin, A.P.; Riley, P.B.; Herman, D.E.; Clifton, R.S.) |
| Abstract | Communications satellite link availability assessments have traditionally been based on a minimum terminal-satellite elevation angle. This approach is generally acceptable for transmission frequencies below approximately 10 GHz. At the higher SHF and EHF frequencies employed by recent and future systems, however, rain attenuation effects become significant. For these systems, link availability is strongly influenced by the rainfall characteristics of the areas in which the ground terminals are located. While models have been developed to estimate rain attenuation and link availability for specific locations, there has been no way to easily generate global or regional contours of availability for systems operating at these rain-sensitive frequencies. The GLIMPSE (Graphical Link Margin Plotting Software) computer model was developed by The Aerospace Corporation to address this void. GLIMPSE generates color-coded world or regional maps showing link availability contours for a specified satellite constellation, link margin, transmission frequency, and terminal antenna diameter. GLIMPSE can also solve the inverse problem of generating contours of link margin required to achieve a specified target link availability. GLIMPSE incorporates Crane's (1982) two-component model of rain attenuation as well as standard models of atmospheric attenuation (water vapor and oxygen) and low elevation fade effects. GLIMPSE has been used extensively in several military satellite communications (Milsatcom) programs. Although originally developed for use with geosynchronous Milsatcom systems, GLIMPSE can be applied to other satellite communications systems utilizing frequencies in the 1-100 GHz range and operating in any type of orbit. |
| Starting Page | 687 |
| Ending Page | 693 |
| File Size | 1200406 |
| Page Count | 7 |
| File Format | |
| ISBN | 0780324897 |
| DOI | 10.1109/MILCOM.1995.483554 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1995-11-05 |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Artificial satellites Availability Attenuation Rain Frequency estimation Atmospheric modeling Software Satellite constellations Satellite antennas Transmitting antennas |
| Content Type | Text |
| Resource Type | Article |
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
Learn more about this project from here.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
| Sl. | Authority | Responsibilities | Communication Details |
|---|---|---|---|
| 1 | Ministry of Education (GoI), Department of Higher Education |
Sanctioning Authority | https://www.education.gov.in/ict-initiatives |
| 2 | Indian Institute of Technology Kharagpur | Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project | https://www.iitkgp.ac.in |
| 3 | National Digital Library of India Office, Indian Institute of Technology Kharagpur | The administrative and infrastructural headquarters of the project | Dr. B. Sutradhar bsutra@ndl.gov.in |
| 4 | Project PI / Joint PI | Principal Investigator and Joint Principal Investigators of the project |
Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon |
| 5 | Website/Portal (Helpdesk) | Queries regarding NDLI and its services | support@ndl.gov.in |
| 6 | Contents and Copyright Issues | Queries related to content curation and copyright issues | content@ndl.gov.in |
| 7 | National Digital Library of India Club (NDLI Club) | Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach | clubsupport@ndl.gov.in |
| 8 | Digital Preservation Centre (DPC) | Assistance with digitizing and archiving copyright-free printed books | dpc@ndl.gov.in |
| 9 | IDR Setup or Support | Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops | idr@ndl.gov.in |
|
Loading...
|