Pulse or digital communications – Receivers – Angle modulation
Statutory Invention Registration
2006-05-02
2006-05-02
Clement, M. (Department: 3641)
Pulse or digital communications
Receivers
Angle modulation
C375S316000, C375S322000, C375S324000, C375S354000, C375S361000
Statutory Invention Registration
active
H0002155
ABSTRACT:
An improved apparatus and method for determining the carrier frequency in a biphase coded signal such as the course acquisition code signal in a global position sensing system. The described system may also be used for other purposes. The described system is based on use of the conventional data signal squaring or frequency doubling step to remove biphase coding but performs a series of frequency reducing steps prior to applying the Fourier transformation sequence. The frequency reducing steps include heterodyne mixing and signal averaging. These frequency-reducing steps diminish the speed and capacity requirements imposed on the Fourier transformation sequence and thereby decrease the cost and complexity of the overall system.
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Lin David M.
Tsui James B. Y.
Clement M.
Hollins Gerald B.
The United States of America as represented by the Secretary of
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