主题：有谁知道SPREAD SPECTRUM技术吗？ -- 远航

注意，这应用只是普通的遥控模型，也不可能有很多用户同时使用。厂家说

最多也不过百。

AM, FM, PCM and now DSM. Spektrum's DSM (Digital Spectrum Modulation) system advances RC radio technology to the next generation. Based on an optimized version of Direct Sequencing Spread Spectrum, DSM offers pure digital control, providing an impenetrable radio link that's immune to all types of interference. And with 4096 bit resolution and 5.6ms response time, the DSM system offers seemingly infinite accuracy and instantaneous response for a totally connected RC experience.

WORLD'S MOST SECURE RADIO LINKS

For the highest security levels of radio communications, NASA, the U.S. military and government agencies like the CIA and FBI rely on Spread Spectrum technology. Whether guiding unmanned reconnaissance aircraft over enemy territory, controlling satellites in space or communicating critical mission orders to the battlefield, the impenetrable secure link that Spread Spectrum coding provides makes it ideal for these decisive security applications.

And now Spektrum offers this technology for RC cars, park flyers and micro helis.

SPEKTRUM'S DSM TECHNOLOGY

In development for over four years, Paul Beard, a leading engineer in the Spread Spectrum industry, designed Spektrum's DSM 2.4GHz Spread Spectrum Technology. The DSM 2.4GHz Spread Spectrum Technology utilizes Direct Sequencing Spread Spectrum technology that has been optimized for RC use. Unlike current narrow band 27 and 75MHz systems, Direct Sequencing Spread Spectrum or DSSS generates a wide signal on a single frequency, and information is encoded with its own Globally Unique Identification number (called GUID) such that the receiver only recognizes the information from its specific transmitter. And with over 4.2 billion available GUID codes, it is virtually impossible for a receiver to be controlled by anything other than its mating transmitter. Spektrum calls this optimized form of modulation DSM-Digital Spectrum Modulation.