Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By frequency
Reexamination Certificate
2009-06-15
2010-12-07
Donovan, Lincoln (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By frequency
C329S336000, C708S311000, C455S214000, C324S076410
Reexamination Certificate
active
07847597
ABSTRACT:
A frequency change detector splits a frequency standard signal into two undelayed frequency signals, one of which is delayed by a predetermined amount. The delayed signal is then mixed with the undelayed frequency signal into a mixed signal that is further filtered and amplified for providing an output signal indicating frequency changes of the frequency standard signal. The mixed frequency signal indicates frequency changes of the original frequency standard signal without reference to another frequency standard. This frequency change detector is well suited for use on satellites as an early warning detection of changes in on-board atomic frequency standards.
REFERENCES:
patent: 4336505 (1982-06-01), Meyer
patent: 4754228 (1988-06-01), Tomlinson
patent: 4780667 (1988-10-01), Reese et al.
patent: 5568305 (1996-10-01), Naito et al.
patent: 6396338 (2002-05-01), Huang et al.
patent: 6847255 (2005-01-01), Petrovic et al.
Camparo James C.
Chan Yat C.
Humphries, legal representative Christine
Johnson Walter A.
Karuza Sarunas K.
Donovan Lincoln
O'Neill Patrick
The Aerospace Corporation
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