| 摘要 |
PURPOSE:To make an AGC circuit, which is essential convertionally, needless by detecting and processing phase information of the loran A signal receiving wave. CONSTITUTION:A part of the output of receiving amplifier 2 is applied to polarity switch 6. Polarity switch 6 uses the timing signal generated by time difference measuring equipment 10 as the other input, and outputs the inphase signal and the antiphase signal of the output of receiving amplifier 2 alternately for every integer multiple of the repeat period of the loran A signal while switching them. In response to this switching, the phase of the output of limiter amplifier 9 is inverted. Polarity switch 6 erases off-set, which product detector 5 and limiter amplifier 9 have, by cooperation with time difference measuring equipment 10. The output of limiter amplifier 9 is acquired and tracked by time difference measuring equipment 10, and the time difference between master station signal and slave station signal is measured and is displayed on time difference display equipment 11. |
