| 摘要 |
PURPOSE:To accurately obtain an azimuth angle error signal and an angle-of-elevation error signal, by correcting a phase error from the signal obtained by the synchronizing detection of a difference signal by a sum signal. CONSTITUTION:An input signal 1 is applied to a monopulse comparator 31 through an antenna 30 to be converted to a sum signal 6, and first and second difference signals 7, 8. The output 25 of a local oscillator 41 comes to a signal 22 in a phase modulator 42 by using the signal 19 of a second switch signal generator 43. The sum signal 6 is inputted to a first mixer 33 and mixed with the output 22 to be converted to frequency converted output 10 which is, in turn, further amplified by a first intermediate frequency amplifier 35 while the obtained output 12 comes to the reference signal of a synchronous detector 37. The difference signals 7, 8 are alternately changed over in a first change-over device 32 by a third switch signal 20 to be converted to output 9 which is, in turn, mixed with the output 25 of the local oscillator 41 in a second mixer 34 while the obtained output 11 is amplified by a second intermediate frequency amplifier 36 to obtain output 13. This output 13 is receives the synchronizing detection with the output 12 in a synchronous detector 37 to be converted to output 14 which is, in turn, filtered by a low band pass filter 38 to obtain output 15 while this output 15 receives digital operation in synchronous relation to a fourth switch signal 21 in a digital operator 44 to obtain an azimuth angle error signal 16 and an angle-of-elevation error signal 17.
|
