Abstract
In this paper, we introduce an imaging operator for a high speed holographic SONAR which uses transmitting pulses modulated with a system of orthonormal functions. This operator is based on a singular value decomposition of the transfer matrix of the digital system. The operator reduces the artifact which emerges when a conventional operator is used. The calculations are simplified using an appropriate model and approximations. The operator obtained can be implemented as multiple filters associated with the directions of view. The point spread function of the 2-D imaging system which uses the pulses modulated by Walsh functions is also demonstrated.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Reference
Y. Tamura and T. Akatsuka, A digital beam-former using uncorrelated ultrasound pulses, Proc. of SPIE. 7G8, 85/92(1987)
Y. Tamura and T. Akatsuka, Ultrasound holographic imaging system using high speed scanning with pulses modulated by Walsh functions, Trans. of SICE, 24–3,213/219(1987)
Y. Tamura and T. Akatsuka, Holographic sonar using orthogonal transmitting pulses. Acoustic al Imaging,17,753/760(1989)
Hua Lee. Resolution enhancement of backward propagated images by wavefield orthogonalization. J. Acoust. Soc. Am.,77–5,1845/1848(1985)
Hua Lee, Resolution enhancement by wavefield extrapolation, Trans. of IEEE, SU-31, 6, 642/645 (1984)
Hua Lee and Gen Wade, Constructing an imaging operator to enhance resolution, J. Acoust. Soc. Am., 75–2,499/504(1984)
Hua Lee, Formation of the generalized backward projection method for acoustical imaging, Trans. of IEEE. SU-31,3,157/161(1984)
Hua Lee and D. I. Sullivan, Fundamental limitation of resolution enhancement by wavefield extrapolation, J. Acoust. Soc. Am., 84–2, 611/615(1988)
G. H. Golub and C. Reinsch, “Singular value decomposition and least squares solutions”, Numer. Math.,14, (1970)
Y. Tamura and T. Akatsuka, An echolocation and imaging using transducers of directionally distinguishable impulse response, Acoustical Imaging, 18
K. Koyama. H. Ito, K. Tanaka, and Y. Tamura, Polymer transducer system for imaging using pseudo inverse matrix detection, Acoustical Imaging, 18
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1991 Springer Science+Business Media New York
About this chapter
Cite this chapter
Tamura, Y., Takahashi, M., Akatsuka, T. (1991). An Imaging Operator for a High Speed Holographic Sonar which Uses an Incompletely Orthogonalized Wavefront. In: Lee, H., Wade, G. (eds) Acoustical Imaging. Acoustical Imaging, vol 18. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3692-5_49
Download citation
DOI: https://doi.org/10.1007/978-1-4615-3692-5_49
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4613-6641-6
Online ISBN: 978-1-4615-3692-5
eBook Packages: Springer Book Archive