Communications – electrical: acoustic wave systems and devices – Transponders – Sonobuoys and sonobuoy systems
Patent
1988-03-04
1989-11-07
Tarcza, Thomas H.
Communications, electrical: acoustic wave systems and devices
Transponders
Sonobuoys and sonobuoy systems
H04B 159
Patent
active
048796948
ABSTRACT:
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.
REFERENCES:
patent: 3870989 (1975-03-01), Mallet
patent: 3987404 (1976-10-01), Woodruff
patent: 4393483 (1983-07-01), Hammond et al.
Hamann H. Fredrick
Kirk James F.
Montanye George A.
Pihulic Daniel T.
Rockwell International Corporation
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