Design of a digital frequency discriminator using least squares based phase calibration

Jin Oh Park, Jae Beom Seo, Jung Hee Kim, Sang Won Nam

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

A digital frequency discriminator (DFD), i.e., a frequency measurement device with delay-line discriminators, has been developed for accurate measurement of the instantaneous frequency from received signals. In this paper, a new DFD with unwrapped-phase calibration in each correlator is proposed by reconsidering the basic operating principles of the DFD from a signal processing point of view, which enables us to reduce memory spaces. More specifically, the proposed approach utilizes (i) phase calibration to find the unwrapped phase in each delay time in consideration of integer multiples of 360° and (ii) estimation of the instantaneous frequency by fitting the unwrapped phase into the least-square straight-line. Finally, it is also demonstrated indirectly that the proposed approach can reduce frequency estimation ambiguity in a noisy environment, since it is shown that the proposed design is robust to additive phase noise ±30° under a specific case of the 1:4 ratio DFD, while the conventional DFD designs are restricted to ±22.5° .

Original languageEnglish
Title of host publicationProceedings of SICE Annual Conference 2010, SICE 2010 - Final Program and Papers
PublisherSociety of Instrument and Control Engineers (SICE)
Pages1768-1772
Number of pages5
ISBN (Print)9784907764364
StatePublished - 2010 Jan 1

Fingerprint

Discriminators
Calibration
Frequency estimation
Correlators
Electric delay lines
Phase noise
Time delay
Signal processing
Data storage equipment

Keywords

  • DFD
  • Electronic warfare
  • IFM

Cite this

Park, J. O., Seo, J. B., Kim, J. H., & Nam, S. W. (2010). Design of a digital frequency discriminator using least squares based phase calibration. In Proceedings of SICE Annual Conference 2010, SICE 2010 - Final Program and Papers (pp. 1768-1772). [5602930] Society of Instrument and Control Engineers (SICE).
Park, Jin Oh ; Seo, Jae Beom ; Kim, Jung Hee ; Nam, Sang Won. / Design of a digital frequency discriminator using least squares based phase calibration. Proceedings of SICE Annual Conference 2010, SICE 2010 - Final Program and Papers. Society of Instrument and Control Engineers (SICE), 2010. pp. 1768-1772
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abstract = "A digital frequency discriminator (DFD), i.e., a frequency measurement device with delay-line discriminators, has been developed for accurate measurement of the instantaneous frequency from received signals. In this paper, a new DFD with unwrapped-phase calibration in each correlator is proposed by reconsidering the basic operating principles of the DFD from a signal processing point of view, which enables us to reduce memory spaces. More specifically, the proposed approach utilizes (i) phase calibration to find the unwrapped phase in each delay time in consideration of integer multiples of 360° and (ii) estimation of the instantaneous frequency by fitting the unwrapped phase into the least-square straight-line. Finally, it is also demonstrated indirectly that the proposed approach can reduce frequency estimation ambiguity in a noisy environment, since it is shown that the proposed design is robust to additive phase noise ±30° under a specific case of the 1:4 ratio DFD, while the conventional DFD designs are restricted to ±22.5° .",
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Park, JO, Seo, JB, Kim, JH & Nam, SW 2010, Design of a digital frequency discriminator using least squares based phase calibration. in Proceedings of SICE Annual Conference 2010, SICE 2010 - Final Program and Papers., 5602930, Society of Instrument and Control Engineers (SICE), pp. 1768-1772.

Design of a digital frequency discriminator using least squares based phase calibration. / Park, Jin Oh; Seo, Jae Beom; Kim, Jung Hee; Nam, Sang Won.

Proceedings of SICE Annual Conference 2010, SICE 2010 - Final Program and Papers. Society of Instrument and Control Engineers (SICE), 2010. p. 1768-1772 5602930.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - A digital frequency discriminator (DFD), i.e., a frequency measurement device with delay-line discriminators, has been developed for accurate measurement of the instantaneous frequency from received signals. In this paper, a new DFD with unwrapped-phase calibration in each correlator is proposed by reconsidering the basic operating principles of the DFD from a signal processing point of view, which enables us to reduce memory spaces. More specifically, the proposed approach utilizes (i) phase calibration to find the unwrapped phase in each delay time in consideration of integer multiples of 360° and (ii) estimation of the instantaneous frequency by fitting the unwrapped phase into the least-square straight-line. Finally, it is also demonstrated indirectly that the proposed approach can reduce frequency estimation ambiguity in a noisy environment, since it is shown that the proposed design is robust to additive phase noise ±30° under a specific case of the 1:4 ratio DFD, while the conventional DFD designs are restricted to ±22.5° .

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Park JO, Seo JB, Kim JH, Nam SW. Design of a digital frequency discriminator using least squares based phase calibration. In Proceedings of SICE Annual Conference 2010, SICE 2010 - Final Program and Papers. Society of Instrument and Control Engineers (SICE). 2010. p. 1768-1772. 5602930