| 摘要 |
PURPOSE:To obtain a high sensitivity tracking receiver, by bringing each of the frequency bands of first - third IF amplifiers to a narrow band by using a synchronous detector wherein it is unnecessary to lower an azimuth angle error signal and a high and low angle error signal to a base band. CONSTITUTION:The receiving signal from a target is received by an antenna 2 generating a rosette scanning pattern and antenna output 3 is branched to be inputted to first, second and third mixers 4, 6, 8. The local oscillation output of a local oscillator 14 is applied not only to the mixer 6 but also to first and second phase modulators 10, 12 and the outputs thereof are applied to the mixers 4, 8. The respective first and second IF amplifier outputs 17, 21 from the mixers 4, 8 are applied to first and second synchronous detectors 82, 84. These respective detectors 82, 84 are controlled by the second IF amplifier output 19 from the mixer 6 to respectively output an azimuth angle error signal 23 and a high and low angle error signal 25. When first mixing output is outputted from the mixer 4, frequency is converted using a switch signal in formula I or II.
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