Spot Image - HOME Distributor of satellite imagery received from optical and radar remote sensing satellites. This earth observation raster imagery is compatible with all GIS and used for example in land mapping or vegetation monitoring. http://www.spotimage.fr/home/
Weather Satellites I soon realised that it could also receive weather satellites that are in polar orbit, and transmit their data on VHF using Automatic Picture Transmission (APT http://www.david-taylor.pwp.blueyonder.co.uk/wxsat/
Extractions: Puzzle 4 - Outlines Over Christmas 1998 I decided to act on a long-term but dormant interest that I have, remote imaging. I had purchased a scanner, the Icom IC-R2, again something that I'd been intending to do for a long time, but never actually got around to doing. The IC-R2 is a great box, with lots of opportunities to listen to aircraft and so on. I soon realised that it could also receive weather satellites that are in polar orbit, and transmit their data on VHF using Automatic Picture Transmission (APT) and on UHF using High Resolution Picture Transmission (HRPT). Once I discovered free decoding software on the Internet I was set and I got my first results . I've now added more sets of results including the recent Hekla eruption , the 1999 total solar eclipse , and a radar image of Norway . Roger Ray supplied the image on which this aircraft trail picture is based. The trail is quite thick as the aircraft was circling, and the very low angle of the sun has resulted in a shadow some 50km away just off John o' Groats! Some other puzzle pictures included a cloud effect over Iceland , outlines looking like image-processed pictures , and some radar images However I experienced severe problems with interference from very local pager transmissions (this is mainly a UK issue) and I've put together a few notes on how I've managed to reduce the problem to an acceptable level. My
Visual Satellite Observer's Home Page A detailed, interesting, useful collection of information for anyone who wants to view satellites in orbit. http://www.satellite.eu.org/satintro.html
Extractions: please update your bookmarks and links! What's new on the VSO Home Page. If you've ever spent some time star gazing shortly after sunset or before sunrise, you've probably noticed one or two "stars" gracefully sailing across the sky. These are orbiting satellites of various types and ages, visible due to the reflection of the Sun's light off their surfaces toward the observer. Satellite observation has much to offer amateur astronomers and space enthusiasts. The challenges involved in spotting a faint, rapidly moving satellite are comparable to spotting a distant galaxy. The hobby leads naturally into such diverse topics as orbital motion, propulsion, mathematics, physics, computer science, commercial, scientific and military applications of satellites, and government space policy. During the first 30 years of the space age, geophysicists used positional measurements of satellites by hobbyists, alongside those of radars and telescopic cameras, to analyze satellite orbit perturbations, revealing details of Earth's upper atmosphere and gravity field.
Laser Beamed Power A paper discussing the use of groundbased lasers to provide power for satellites during eclipse http://powerweb.grc.nasa.gov/pvsee/publications/lasers/IAF92_0600.html
Extractions: Rockville, MD 20853 USA It is possible to use a ground-based laser to beam light to the solar arrays of orbiting satellites, to a level sufficient to provide all or some of the operating power required. Near-term applications of this technology to providing supplemental power for existing satellites are discussed. Two missions with significant commercial pay-off are supplementing solar power for radiation-degraded arrays, and providing satellite power during eclipse for satellites with failed batteries. Beaming of power by laser from the installations on the surface of the Earth to photovoltaic receivers in space is a technology of considerable interest for many applications [1]. An earlier paper [ ] proposed using lasers for eclipse power for communications satellites or other earth-orbiting systems (included as appendix 1 to this report). In this paper it is proposed that a near-term demonstration mission for laser power beaming might be to provide power to existing satellites at or near the end of life due to power system degradation. Such a mission would both demonstrate laser power beaming at a power level that may be achievable with existing technology systems, and also have a large commercial value.
BBC News | SCI/TECH | Spy Satellites Retasked Top secret US spy satellites are given new orders to concentrate on Afghanistan. http://news.bbc.co.uk/hi/english/sci/tech/newsid_1548000/1548860.stm
Extractions: By BBC News Online science editor Dr David Whitehouse US spy satellites have been given new instructions to concentrate their attention on Afghanistan and the search for Osama Bin Laden, and groups associated with him, sources have told BBC News Online. So-called Signal Intelligence (Sigint) satellites, designed to intercept radio and mobile phone traffic, have been "retasked", as have two spy satellites that take high-resolution images. The use of Sigint satellites marks a departure from normal procedure, as they are not usually used to gather intelligence about dissident groups in that region. BBC News Online also understands that US military sources have also made approaches to two commercial satellite operators, to use data from two private imaging satellites that will be launched in the next few weeks. Following conversations The so-called "retasking" of spy satellites is an unusual step that reflects the seriousness of the response to the hijack plane attacks on New York and Washington DC.
OHB-System - Technology For Space Mediumsized system house, with national and international projects in the fields of satellites, manned space flight and technologies for security and reconnaissance. The headquarters are located in Bremen, Germany. http://www.ohb-system.de/
The Satellite Encyclopedia The Satellite Encyclopedia is a technical reference containing information on 2000 satellites. Multiple thematic listings (country http://www.tbs-satellite.com/tse/
NASA Experimental Communications Satellites 1958-1995 NASA Experimental Communications satellites. Contents. NASA has been geosynchronous orbit. RELATED satellites. TDRSS. 93hc138s.gif(68K). The http://roland.lerc.nasa.gov/~dglover/sat/satcom2.html
Extractions: NO FRAMES FRAMES NASA has been active in the development of the communications satellite from the founding of the agency in 1958 to the present day. Communications has been the most successful commercial enterprise in space. Of the hundreds of communications satellites sent into orbit, around 150 are operational today. To enable this success, NASA has launched several experimental satellites to develop the technology needed for commercial applications. This document presents a short history of experimental communications satellites developed by NASA. The projects are covered in chronological order: Click on the headings below (satellite names) for more detail. This picture shows the latest NASA experimental communications spacecraft, the Advanced Communications Technology Satellite (ACTS), after deployment from the Space Shuttle Discovery on mission STS-51 on September 12, 1993. NASA has been active in the development of the communications satellite from the founding of the agency in 1958 to the present day. Communication is the most successful commercial enterprise in space. Of the hundreds of communications satellites sent into orbit, approximately 150 are operational today. To enable this success, NASA has launched several experimental satellites to develop the technology needed for commercial applications.
ESA CEOS Homepage The European Space Agency is a member of the CEOS (Committee for Earth Observation satellites). Committee on Earth Observation satellites (CEOS). http://ceos.esa.int/
Extractions: The European Space Agency is a member of the CEOS (Committee for Earth Observation Satellites). In cooperation with other space agencies and international organizations, ESA contributes to the development of compatible data products, formats, services, applications and policies, for the benefits of the international user community. CEOS currently has two standing working groups: Working Group on Information Systems and Services (WGISS) WGISS has the goal of coordinating and standardising EO data management and services, addressing the needs of: data providers by assisting them to improve the efficiency of their operations and maximising the utilisation and benefit of the EO data which they gather; and data and information useres by providing simpler and wider access to the resources which they acquire. Working Group on Calibration and Validation (WGCV) WGCV ensures the quality, accuracy and long-term confidence in EO data products the Working Group on Calibration and Validation (WGCV) provides a focus for co-ordination and co-operation in activities related to calibration and validation (cal-val) of Earth observations. CEOS Meeting Calendar IGOS Plenary Meeting
Satellite Communications Company - VPN Networks - Telesat Canada Operate a fleet of satellites for the provision of broadcast distribution and telecommunications services. Provides a range of information on services, and operated satellites including Anik and Nimiq . http://www.telesat.ca/
Satellites And The Internet satellites AND THE INTERNET Challenges and Solutions By DC Palter 1st Edition. This book is written for the satellite professional http://www.satnews.com/free/pubs/internetinfo.html
Extractions: This book is written for the satellite professional who wants to learn about the design of the Internet and the TCP/IP protocols. In particular, this book focuses on the background needed understand and overcome the performance limitations of TCP/IP when running over satellite in order to be able to design a satellite-based IP network which can take best advantage of expensive satellite bandwidth. With the growth of the Internet, computer networking for e-mail and Web communications by consumers, businesses, and governments has quickly become a larger consumer of bandwidth than telephony. Even voice traffic is migrating to run over IP. This has created an important new market for communications satellites especially in providing links to the many locations across the globe where terrestrial options have difficulty reaching. The growth of the Internet has also made TCP/IP the de facto standard for all computer networking, making it critical for satellite operators and users to understand the fundamentals of TCP/IP. Unfortunately, the TCP protocol is not well designed for long delay, high bit error, and asymmetric bandwidth conditions typical of satellite networks. Consequently, it is necessary for the satellite network architect to understand the cause of these limitations and how to design around them in order to create an efficient, responsive network that does not suffer from the performance constraints and can compete with terrestrial alternatives.
Spot Image - HOME Distributor of satellite imagery received from optical and radar remote sensing satellites used for land mapping or vegetation monitoring. http://www.spotimage.fr/
How Satellites See How satellites See. by Christina Wilder Topics Covered by This Lesson Astronomy/Space Science electromagnetic spectrum; NASA satellites. http://cse.ssl.berkeley.edu/lessons/indiv/wilder/summary.html
Extractions: by Christina Wilder Student Prerequisites: Some understanding of the spectrum, using thermometers, different types of light sources and simple geographical and Earth/Sun/Moon System and artificial satellite concepts Topics Covered by This Lesson: Astronomy/Space Science: electromagnetic spectrum; NASA satellites Physics: electromagnetic spectrum Brief Overview: This project will compare and contrast three NASA satellites: The Extreme Ultraviolet Explorer (EUVE), The Cosmic Background Explorer (COBE), and the Hubble Space Telescope (HST). The lesson includes access to data and images from these three NASA astronomy satellites, contrasting the way the sky appears in three very different electromagnetic wavelengths or colors of light. Other satellite information is included, but the project's focus is a simple introduction to the electromagnetic spectrum as used by the three space observatories. Unit Features: Maps of Earth at Different Projections and Maps of the EUVE Sky at Different Projections (149407 bytes) The Visible Sky (161130 bytes) The Great Observatories (148897 bytes) COBE Spacecraft (159028 bytes) EUVE Spacecraft (215066 bytes) The Electromagnetic Spectrum (166704 bytes) Extreme Ultraviolet Image of the Sky (143043 bytes) Near Infrared Image of the Sky (127796 bytes) Temperature Variations in Cosmic Radiation (COBE) (133419 bytes) Temperatures of the Great Observatories (169190 bytes)
Teledesic LLC Development project for the creation of a global, broadband Internet network via a constellation of LEO satellites. http://www.teledesic.com/
USGS Flagstaff Planetary Map Index - TOC INDEXES OF MAPS OF THE PLANETS AND satellites 1992. by JL Inge and RM Batson. Jovian satellites Maps of Io; Maps of Europa; Maps of Ganymede; Maps of Callisto. http://wwwflag.wr.usgs.gov/USGSFlag/Space/mapbook/
Extractions: by J.L. Inge and R.M. Batson TABLE OF CONTENTS Listing of maps published since 1992 Mars Jovian satellites Saturnian satellites Uranian satellites Neptunian satellites Appendix I: General list of all maps Appendix II: List of I-maps Appendix III: List of geologic maps ... Appendix VII: Availability of Printed Maps
