| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a two-channel tracking device and a tracking method that prevent precision of satellite position detection from becoming worse. <P>SOLUTION: A tracking device 1 generates a sum signal and a difference signal from a tracking signal, performs suppression carrier amplitude modulation on the sum signal with a modulation signal generated by a signal oscillator 14, and combines a modulated sum signal with a difference signal. The sum signal and a composite signal are amplified, converted to an intermediate frequency, and transmitted. An AGC circuit 20 amplifies the sum signal, and an AGC circuit 21 amplifies the composite signal so that a difference from the gain of the sum signal is within a predetermined range. A detector 24 and a detector 23 perform phase detection on the composite signal with the sum signal and the sum signal having been shifted in phase by 90°, and detects an in-phase component and an orthogonal phase component of a tracking error signal. A synchronous detector 26 and a synchronous detector 25 perform synchronous detection on the in-phase component and the orthogonal phase component with the modulation signal, detect an in-phase component and an orthogonal phase component of a transmitted modulation signal, and calculate phase variation α and amplitude variation A during transmission. A DC component of the tracking error signal is corrected on the basis of α and A, and the resulting signal is transmitted to an antenna driving part, etc. <P>COPYRIGHT: (C)2013,JPO&INPIT |
