Alias-free estimation of blood velocity using phase difference and amplitude correlation of chirp echo spectrum

Itsuki Kuga, Naohiko Tanaka

Research output: Contribution to journalArticle

1 Citation (Scopus)


Aalias-free estimator based on FM Doppler technique that uses both phase and amplitude information was used to observe higher blood velocities at low calculation costs. The proposed estimator has a chip signal in which frequency increases linearly with time is used for the transmission in the estimator. The frequency difference is detected by multiplying the received signal and the reference signal which is similar to the temporal extension of a transmitted signal. The estimator was used to produce software-based simulation results of velocity estimation. The velocity dispersion follows a normal distribution with a standard deviation of 10% with respect to the average of target velocity. The estimator can be used for various practical applications.

Original languageEnglish
Pages (from-to)183-186
Number of pages4
JournalAcoustical Science and Technology
Issue number3
Publication statusPublished - 2006 May 15



  • Aliasing
  • Amplitude correlation
  • Chirp signal
  • Doppler
  • Phase difference

ASJC Scopus subject areas

  • Acoustics and Ultrasonics

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