HDTV and the Internet driving the demand for satellite "spot beams"
It was a hundred years ago that Marconi invented wireless communication (1902). Until 1930, he had many homes in the United States and Europe to an AM radio receiver. The world changed a lot in the 20 Century. Courier 1B (Philco), the first active communications satellite, was launched in 1960 to life. We now face new challenges of communication. High Definition TV (HDTV), a bandwidth much wider transmission, with the current demand needs of hundreds of TV-linkedChannels and the growth of Internet communications, will result in a communication bandwidth limitations. A tool that is used to solve this problem is posed satellite beams. By 2010, 60% of TV receivers using a satellite signal, from 15% in 2002.
What are the satellite spot beams?
Until recently provided satellite communications with a very broad signal. The same signal that was received in California, from the same source as the signal that was received in NewYork. Satellites that are not "spot beams a signal on large areas, data transfer across the United States.
Spot beams are different. It 'like a spotlight focused on one area of the country. A typical beam spot has a radius of only 50-100 miles. Depending on where you are in the country, not knowing when the beam focus. With this tool, the same frequency spectrum with different raw materials are used in different regions. Furthermore, theThe system is flexible enough to compensate for certain programs needed to improve local weather conditions. Spot beam technology is ideal for transmitting video bit rate require very high as HDTV.
DirecTV and DISH Network were using one of the first ray spot. The transfer of the local television station, is ideal as a signal was concentrated over an area a perfect fit for your application. The spot beam technology is applied to the newer Ka-band Satellite(Ka-band 19-30 GHz). There are several Ka-band satellites in use, spot beams: Advanced Communication Technology System (U.S. NASA), Superbird and N-STAR (Japan), HOT BIRD 6 (Eutelsat, France), DFS Kopernikus (Germany), and ITALSAT ( Italy), but the newer satellites with more advanced technology spot beams.
Anik F2 (built by Boeing, and will be operated by Telesat) was launched on 17 July 2004 and approved on October 1. He is currently the world's largest communicationsSatellite to 157 meters long and 27 meters wide. Anik F2 provides Internet services, distance learning and telemedicine in the United States and Canada. Anik F2 has 45 transponders providing spot beams with broadband signals. A third of the spot beams to provide free broadband in Canada. The rest are used to provide Internet services in the U.S.
HDTV spot beams
HDTV spot beams from DirecTV and DISH Network (Ka-band) are used even more limited than Ku-band spot beams used forStandard Definition TV. If you live more than 50 miles from the center of the signal in a region populated, you will not be able to identify the beams HDTV. DirecTV and DISH Network have the technical capacity of the transmission of a large spot signal, especially the newer satellites can operate at a higher power. Good business sense for them to maximize the coverage, but there are compromises.
In a rural state like New Mexico, it is useful to have spot beamscover a radius of 200 miles, because there are more subscribers, the results can increase revenue. In New England, it is sometimes useful to signal with a narrower focus, since the place beams are packed together more densely. Since, however, uses different frequencies for adjacent spot beams, overlapping can be largely managed.
Satellites spot beams and two-way communication
According to Northern Sky Research, there are 15 million U.S. households have no access to broadbandInternet service. Spot beam satellites operated by Telesat WildBlue and already have over 300,000 Internet subscribers has reached since its introduction in 2005.
One advantage of Ka band is that it must offer a small bowl for the very good performance. Ka-band spot beams is more efficient than a conventional C-or Ku-band satellite (the technology of the other satellite communications systems will be used). The service is able to significantly improve performance. A Ka-band satellitescan be an 8x increase as Ku-band satellites. The technology can provide faster upload speeds to 16 Mbps download speed to 30 Mbps and faster Three satellite Ka-band spot beams technology are already operating in the third in North America: Anik F2, Telesat Canada, WildBlue WildBlue Communications, 1, and Hughes Network Systems Spaceway
ViaSat-1 and KA-SAT: Satellite Communications on Steroids
A fourth satellite in North America, ViaSat-1 (anotherTelesat Satellite) is scheduled for launch in 2011. This system has appointed a highly advanced satellite broadband Ka-band Viasat. The amount of bandwidth, the ViaSat-1 is activated by, with ViaSat SurfBeam "system with the network, is unprecedented. Total volume is designed to develop the capacity of more than 100 gigabits per second combined, which is more capacity compared to the current North American fleet of two-way Ka-, Ku-band CE. In 2010, KA-SAT will launch a satellite for similar servicesEurope.
HDTV signals require 4-5 times the bandwidth for the transmission of signals very standard definition, even with sophisticated MPEG-4. Furthermore, our communication needs and share the Internet bandwidth of about 50% annual growth. Keep pace with demand requires a buffet of options and spot beam satellite (Ka-band), will be very important in the mix.
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