| 摘要 |
A mobile radio transmitter loaded on a traveling object which transmits high-frequency signals as a carrier signal in order to provide information about a temporary location of the mobile object to a control station independently of the number of the mobile objects, and regardless of the occurrence mutual interference in frequency, by adapting a frequency expanding method. The transmitter includes a first amplifier 10 for amplifying a high-frequency signal; a demodulator 20 for demodulating a calling code signal and a received carrier signal; a decoder 30 for decoding the calling code signal; a pseudo noise generator 40 for generating pseudo noise; a modulator 50 for executing a first modulation of said pseudo noise; a second amplifier 60 for amplifying the high-frequency signal generated from said modulator; a duplexor 70 for transmitting the amplified high frequency signal or outputting the high frequency signal received through an antenna ANT to the first amplifier; and controller 80 for the overall operation.
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