| 摘要 |
A demultiplexer circuit responsive to a composite input signal from a sonobouy. The invention circuit has a filter and comparator means responsive to the composite signal for providing a filtered frequency pilot reference signal. The filtered frequency pilot reference signal has a frequency equal to one half the frequency of a reference carrier signal in the composite signal. The invention circuit has a sine demodulator means responsive to the composite signal and to an east/west demodulator signal for providing an east referenced output signal. A cosine demodulator means is responsive to the composite signal and to a north/south demodulator signal for providing a demodulated phase pilot signal and the north referenced output signal. A north/south filter means is responsive to the output signals from the cosine demodulator means for filtering the demodulated phase pilot signal to provide the north referenced output signal. A servo means is responsive to the filtered frequency pilot reference signal and to the demodulated phase pilot signal for generating and controlling the phase of the north/south demodulator signal and the east/west demodulator signal using a single phase locked loop. The servo means is characterized to phase shift the north/south and east/west demodulator signals to adjust the outputs of the sine and cosine demodulator means to remove all error bias measured with respect to ground from the demodulated phase pilot signal.
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