Digital quadrature phase detection

Patent · 01 January 1992

OSTI ID:868317

Smith, James A ^[1]; Johnson, John A ^[1]

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1. Idaho Falls, ID

A system for detecting the phase of a frequency of phase modulated signal that includes digital quadrature sampling of the frequency or phase modulated signal at two times that are one quarter of a cycle of a reference signal apart, determination of the arctangent of the ratio of a first sampling of the frequency or phase modulated signal to the second sampling of the frequency or phase modulated signal, and a determination of quadrant in which the phase determination is increased by 2.pi. when the quadrant changes from the first quadrant to the fourth quadrant and decreased by 2.pi. when the quadrant changes from the fourth quadrant to the first quadrant whereby the absolute phase of the frequency or phase modulated signal can be determined using an arbitrary reference convention.

• Research Organization: EG & G IDAHO INC
• DOE Contract Number: AC07-76ID01570
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 5117440
• OSTI ID: 868317
• Country of Publication: United States
• Language: English

Related Subjects

/375/329/359/
absolute
apart
arbitrary
arctangent
changes
convention
cycle
decreased
detecting
detection
determination
determined
digital
digital quadrature
fourth
frequency
increased
modulated
modulated signal
phase
phase modulate
phase modulated
quadrant
quadrature
quadrature phase
quarter
ratio
reference
reference signal
sampling
signal
times
whereby