Volume 76, Issue 8 pp. 109-118
Article
Full Access

A method of image reconstruction for snow search radar using an estimated permittivity of snow

Ryuichi Mitsuhashi

Ryuichi Mitsuhashi

Member

Faculty of Engineering, Hokkaido University, Sapporo, Japan 060

Ryuichi Mitsuhashi: graduated in 1988 from the Dept. of Electrical Engineering, Hokkaido University, where he obtained a Dr. of Eng. degree in 1993. In that year, he became a Lecturer in the Dept. of Applied Electronics Engineering at Hokkaido Institute of Technology. He has been engaged in research on snow search radar, long wavelength holography, signal processing, satellite communication and image processing.

Search for more papers by this author
Yoshinao Aoki

Yoshinao Aoki

Member

Faculty of Engineering, Hokkaido University, Sapporo, Japan 060

Yoshinao Aoki: graduated in 1964 from the Department of Electrical Engineering, Hokkaido University, where he obtained an M.S. in 1966 and a Dr. of Eng. degree later. In 1966, he became a Lecturer at the same university, was promoted to Assoc. Professor in 1967 and to Professor in 1979. In 1987, he became a Professor in the Department of Information Engineering. From 1969 to 1971, he was on leave at Laval University in Canada. He was a Visiting Professor at Shinyan Technical University, Computer Science Institute. He is Chairman for the Sapporo Electronics Center Steering Committee. He has been engaged in research on long wavelength holography, signal processing, computer image processing, microcomputer applications and snow search radars. He received a Yonezawa Award in 1968. He is the co-author of Visualization of Invisible Information (Shoko-do); and Lectures on Microcomputers (Shoko-do) and is author of BASIC Numerical Computation Methods (Corona Publ.); Wave Signal Processing (Morikita); and Chinese Computer World (Kyodo Bunka Publ.). He is a member of the Information Processing Society; Applied Physics Society; Japan Acoustic Society; IEEE; and OSA.

Search for more papers by this author

Abstract

For the image reconstruction of the snow search radar based on the principle of multifrequency holography method, the values of the relative permittivity of snow to be interrogated are needed. Since the relative permittivity of snow changes by various factors, it was necessary to measure it by some means at the same time as the search. The relative permittivity of the snow with low water content which is the medium of the snow search radar has a strong correlation with the density of the snow. Hence, the relative permittivity was estimated by measurement of the density in the past.

To eliminate such a procedure, it is necessary to estimate the relative permittivity of the snow from the multifrequency hologram which comprises the data obtained by the snow search radar. In the multifrequency hologram, the information along the frequency axis and that on the azimuth axis are recorded independently. In addition, the distance information in each axis varies in the direction opposite to that of the change of relative permittivity. This property was used for automatically estimating the relative permittivity of snow by discriminating the focusing of the reconstructed image.

In this paper, a method is presented for estimating the relative permittivity of snow from the data of the snow search radar. The results are given for processing of actual data.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.