| 摘要 |
PURPOSE:To detect even a low C/N stably by a method wherein input signals are demodulated to coherent and carrier waves are regenerated, the carrier waves are modulated again and modulated waves are generated, and antenna error signals are detected using the modulated waves as the reference signals. CONSTITUTION:The sum signals of angle error signals detected by means of an antenna enter a phase synchronous loop 3 through filters 1 and AGC amplifiers 2, and reference carrier waves are regenerated here. Synchronous AGC controlling voltage is also detected at the same time and the AGC amplifiers 2 are controlled, the voltage is inputted to a demodulator 4 and the signals are demodulated using the reference carrier waves as the reference, and modulated signals are detected. The signals form remodulated waves by means of remodulators 7 and the waves enter phase detectors 6, the waves are phase-detected with AZ error signals and EL error signals, and the antenna is driven. Thus, even the low C/N can stably be detected even to signals having no carrier wave component as the modulated signals. |
