An effective usage of vector network analyzer for microwave imaging

In this paper, an effective usage of a vector network analyzer (VNA) for microwave imaging of conducting objects is presented. In the measurement arrangement, a novel four-port transmission test set is developed to combine with a laboratory VNA as a four-port transmission VNA. It is shown to effectively acquire four sets of the frequency-swept object scattered field in a multistatic arrangement for each object rotation angle. The image reconstruction formulations of this arrangement are derived under physical optics approximation. The measurement system, calibration method, and experimental results are presented. Reconstructed images of continuous and discrete conducting objects and a B-52 model aircraft measured in the frequency range 7.5-12.5 GHz are shown in good agreement with the scattering object geometries. These measured results demonstrate the effectiveness of the developed four-port microwave imaging system.

[1]  C. Hoer.  A Network Analyzer Incorporating Two Six-Port Reflectometers , 1977 .

[2]  R. Lewis.  Physical optics inverse diffraction , 1969 .

[3]  Dale A. Ausherman,et al.  Developments in Radar Imaging , 1984, IEEE Transactions on Aerospace and Electronic Systems.

[4]  Chung-ching Chen,et al.  Multifrequency Imaging of Radar Turntable Data , 1980, IEEE Transactions on Aerospace and Electronic Systems.

[5]  Ding-Bing Lin,et al.  Bistatic frequency-swept microwave imaging: Principle, methodology and experimental results , 1993 .

[6]  D. Mensa.  High resolution radar imaging , 1981 .

[7]  N. Bojarski,et al.  A survey of the physical optics inverse scattering identity , 1982 .

[8]  Nabil H. Farhat.  Microwave diversity imaging and automated target identification based on models of neural networks , 1989 .

[9]  L. Jofre,et al.  Active microwave imaging of inhomogeneous bodies , 1985 .

[10]  Yahya Rahmat-Samii,et al.  Application of spherical near-field measurements to microwave holographic diagnosis of antennas , 1988 .

[11]  Hao Ling,et al.  ASAR-antenna synthetic aperture radar imaging , 1998 .

[12]  C. Elachi,et al.  Spaceborne synthetic-aperture imaging radars: Applications, techniques, and technology , 1982, Proceedings of the IEEE.

[13]  K. Tomiyasu,et al.  Tutorial review of synthetic-aperture radar (SAR) with applications to imaging of the ocean surface , 1978, Proceedings of the IEEE.

[14]  On scattering by large conducting bodies , 1959 .

[15]  A. P. Anderson,et al.  Synthetic aperture tomographic (SAT) imaging for microwave diagnostics , 1982 .

[16]  N. Farhat,et al.  Prospects for three‐dimensional projective and tomographic imaging radar networks , 1984 .