| 摘要 |
PROBLEM TO BE SOLVED: To obtain a tracking receiver capable of calibrating the fluctuation of a local oscillation frequency on a track by providing a calibration signal coupler at a sum signal system input part and further providing a reference RF signal oscillator for calibration, an oscillator control circuit, a level detection circuit, and the like. SOLUTION: When the oscillation frequency for the control voltage of a local oscillation signal oscillator 11 deviates due to temperature fluctuation, fluctuation with passed years, or the like, the level detection signal 34 fluctuates. Therefore, the level detection signal 34 is monitored on the ground, the amount of deviation of an oscillation frequency for the control voltage of the local oscillation signal oscillator 11 is calculated, and the amount of deviation is inputted to a computer 27 as the offset of a Doppler compensation prediction value 28 by a Doppler compensation offset command signal 37. In this manner, by recognizing the deviation of the oscillation frequency for the control voltage of the local oscillation signal oscillator 11 by the level detection signal 34 and taking in it as an offset when the computer 27 calculates and outputs the Doppler compensation prediction value 27, it is possible to make a desired frequency outputted from the local oscillation signal oscillator 11 regardless of temperature fluctuation, fluctuation with passed years, or the like.
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