Digital quadrature phase detection
Abstract
A system for detecting the phase of a frequency or 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. 6 figs.
 Inventors:
 Publication Date:
 OSTI Identifier:
 7273548
 Patent Number(s):
 US 5117440; A
 Application Number:
 PPN: US 7395124
 Assignee:
 Dept. of Energy, Washington, DC (United States) PTO; EDB94082931
 DOE Contract Number:
 AC0776ID01570
 Resource Type:
 Patent
 Resource Relation:
 Patent File Date: 17 Aug 1989
 Country of Publication:
 United States
 Language:
 English
 Subject:
 42 ENGINEERING; SIGNALS; DIGITAL FREQUENCY ANALYSIS; DATA PROCESSING; DIGITAL CIRCUITS; RESOLUTION; ELECTRONIC CIRCUITS; FREQUENCY ANALYSIS; PROCESSING; 426000*  Engineering Components, Electron Devices & Circuits (1990)
Citation Formats
Smith, J.A., and Johnson, J.A. Digital quadrature phase detection. United States: N. p., 1992.
Web.
Smith, J.A., & Johnson, J.A. Digital quadrature phase detection. United States.
Smith, J.A., and Johnson, J.A. 1992.
"Digital quadrature phase detection". United States.
doi:.
@article{osti_7273548,
title = {Digital quadrature phase detection},
author = {Smith, J.A. and Johnson, J.A.},
abstractNote = {A system for detecting the phase of a frequency or 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. 6 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1992,
month = 5
}

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. whenmore »

Digital quadrature phase detection
A system for detecting the phase of a frequency or 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} whenmore » 
Digital induction logging tool including means for measuring phase quadrature components in a phase sensitive detector
A digital induction resistivity logging system is disclosed for digitally measuring in one phase sensitive detector both the inphase (R) and quadrature (X) phase components in a receiver signal generated in response to eddy currents flowing in the earth's subsurface formations. The induction logging system includes a central processing unit (CPU) located at the surface for receiving digital signals from a digital induction logging tool located downhole, and for processing the received data. The digital induction tool includes a digital sinewave generator for generating a highly phase stable, low distortion transmitter signal the frequency of which is selectable from amongmore » 
Analog quadrature signal to phase angle data conversion by a quadrature digitizer and quadrature counter
The quadrature phase angle /phi/(t) of a pair of quadrature signals s/sub 1/(t) and s/sub 2/(t) is digitally encoded on a real time basis by a quadrature digitizer for fractional /phi/(t) rotational excursions and by a quadrature up/down counter for full /phi/(t) rotations. The pair of quadrature signals are of the form S/sub 1/=k(t) sin /phi/(t) and S/sub 2/(t)=k(t) cos /phi/(t) where k(t) is a signal common to both. The quadrature digitizer and the quadrature up/down counter may be used together or singularly as desired or required. Optionally, a digitaltoanalog converter may follow the outputs of the quadrature digitizer andmore » 
Analog quadrature signal to phase angle data conversion by a quadrature digitizer and quadrature counter
The quadrature phase angle .phi.(t) of a pair of quadrature signals S.sub.1 (t) and S.sub.2 (t) is digitally encoded on a real time basis by a quadrature digitizer for fractional .phi.(t) rotational excursions and by a quadrature up/down counter for full .phi.(t) rotations. The pair of quadrature signals are of the form S.sub.1 (t)=k(t) sin .phi.(t) and S.sub.2 (t)=k(t) cos .phi.(t) where k(t) is a signal common to both. The quadrature digitizer and the quadrature up/down counter may be used together or singularly as desired or required. Optionally, a digitaltoanalog converter may follow the outputs of the quadrature digitizer andmore »