| Because of its advantages of high speed, no pollution, safety, and so on, the magnetic levitated vehicle (MAGLEV) has been developing rapidly and it is being used in practice. In the auto-drive of maglev, the communication, location and measuring velocity are very important between the maglev vehicle and the ground stations. The traditional train vehicles can complete these tasks depending on track circuits and by wireless mode, but the maglev vehicle only can complete these tasks by wireless mode, because when maglev vehicle is running, it usually does not touch with the track. Three methods has been adopted for these wireless communications in MAGLEV, they are 38G millimeter, leakage coaxial line and radio induction technology. The millimeter has the largest frequency band and the highest velocity of communication, but it has the highest cost and technical defaults: multi-path effect, reflect and scatter caused by cloud, smoke, water-dropping, the buildings, the grounds and its shape, the interference caused by the thunder, the complexity of device, difficult maintenance, and so on. Now the band of the leakage coaxial line is up to 3GHz,leakage coaxial line has some advantages: good adaptability to cloud, smoke, water-dropping, the buildings, the grounds and its shapes, good steady field, it has some technical defaults: lower resolution for location and measuring velocity, the more complex of its sending-receiving relay devices, weak anti-interference, the strict demand for the hole size in the line, the cleaner work environment and the higher cost. Radio induction is mainly studied in this paper, the traditional radio induction technology has simple structure, lower cost , convenient maintenance and higher location resolution and measuring velocity, but its anti-interference is lower. New Radio Induction System is proposed in this paper, it has excellent anti-radiated interference of any frequency (It should be declared specially that it includes the anti-interference of the same frequency);Because of its high frequency-pass function, the new radio induction system has less affection excited by the conductive interference. So it holds a ideal ability to anti-interference and has 2 scalar level resolution in location and measuring velocity than traditional radio induction technology. And the channel composed of the new radio induction system for communication is different from the parameter-constant channel and thetraditional parameter-changing channel, its parameter is decided by the mutual induction between its antenna and induction-cable, by the location of its antenna, by the signal frequency passing through, its parameter has nothing to do with the time parameter. The channel composed of the new radio induction system is a new parameter-changing channel independently of time for communication. This paper studies the traditional modem in carrier-communication for the new radio induction system in details, theory analysis and simulation show that the new radio induction system can be used in the carrier-communication. The main working contents of this paper is following:1 According to the theory of electromagnetic induction law, a new radio induction system is proposed based on the traditional radio induction technology, analyzed on its signal transmission character and its frequency spectrum character. The channel composed of the new radio induction system is compared with the parameter-constant channel and the parameter-changing channel. The application of the new radio induction system is studied in converter supply.2 The electromagnetic compatibility (EMC) of the new radio induction system is analyzed, this paper studies the affections for the new radio induction system excited by the conductive interference and radiated interference, this paper also studies the affection to the out-space environment excited by the new radio induction system .3 This paper studies the applications in analog carrier communication for the new radio induction system from...
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