What is XM Radio?

XM Satellite Broadcasting Company of the United States provides high-quality satellite digital broadcasting programs for mobile and fixed reception such as automobiles.

XM

(US XM Satellite Broadcasting Company)

XM Satellite Broadcasting Company of the United States provides high-quality satellite digital broadcasting programs for mobile and fixed reception such as automobiles.

Registered in 1992, XM satellite radio has 60,000 users throughout the country. It has the largest and most extensive American radio station, with their headquarters in Washington, D.C., and the use of 3 satellites. With 21 channels for traffic and weather updates alone, 30 news channels, sports and entertainment, and more than 2 million songs, XM entertains, informs and teaches listeners. XM also offers 69 independent

With XM users can watch multiple sports events live for 5000 years, including Major League Baseball, Hockey League, NASCAR, US PGA,

What is satellite broadcasting?

Satellite broadcasting is a wireless broadcasting service that uses satellites to transmit digital audio programs or data to the receiving end. In the past, AM AM and FM FM used analog technology. In the future, it will be gradually replaced by the third-generation broadcast technology DAB (Digital Audio Broadcasting) Because it can transmit digital signals through satellite or ground transmitting stations, it has anti-noise interference and is not affected by the weakening of radio wave transmission. It provides near-zero distortion sound quality. The quality of songs is equivalent to CD. Consumers can choose the listening time and program content. Both are more dominant, so broadcasters can generate more diversified sales models, instead of being limited to the selling time model. The global satellite broadcasting market is dominated by the United States. Originally, the two local companies Sirius and XM monopolized the market. In March 2007, the two companies resolved to merge. ) Approved.

How does satellite broadcasting work?

There are three main components of a satellite broadcasting system: (1) a satellite (2) a ground repeater (3) a ground repeater (3) a radio receiver. Taking the working principle of XM Radio as an example, there are two satellites in geosynchronous orbit (the synchronous satellites can follow the earth's rotation speed and fix its position on the earth's surface), one at 85 degrees west longitude and the other Located at 115 degrees west longitude, the ground base station of XM Radio transmitted the signal to two high-orbit (GEO) synchronous satellites, which bounced the signal back to the ground radio receiver. The radio receiver is set to receive and log data. The signal is decoded. In addition to the encoded music, the signal also has additional information about the broadcast, such as song title, artist, and music type, which will be displayed on the sound. In the metropolitan area, the buildings may block satellite signals. XM's broadcasting system uses ground transmitters as a supplement, and then rebroadcasts to the receivers of urban users, so that the devices in the coverage area can receive messages, improving It has the disadvantages of low-quality sound of traditional analog broadcasting and poor reception and susceptibility to interference when moving fast.