| 摘要 |
PROBLEM TO BE SOLVED: To obtain an antenna tracking signal generation circuit which prevents the malfunction of a tracking operation due to a noise and which can track a satellite only by a satellite broadcasting signal. SOLUTION: A mixer 6 by which a satellite broadcasting signal received by an antenna 1 used to track a satellite is frequency-converted so as to output an intermediate frequency signal is provided. An orthogonal demodulator 10 which demodulates the intermediate frequency signal so as to output a baseband signal is provided. A signal which is proportional to the difference between the level of the baseband signal and the level of a noise as a noise to be output from the orthogonal demodulator 10 and outside the band of the baseband signal is used as a signal which tracks the antenna 1.
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