| Co-Investigator(Kenkyū-buntansha) |
IGARI Kazuhisa TOHOKU UNIV., TECHNICAL OFFICIAL, 工学部, 教務職員
UNO Toru TOHOKU UNIV., ASSOCIATE PROFESSOR, 工学部, 助教授 (80176718)
SAWAYA Kunio TOHOKU UNIV., ASSOCIATE PROFESSOR, 工学部, 助教授 (60108470)
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| Research Abstract |
1. TARGET IMAGING OF CONDUCTING OBJECTS: (1) ONE DIMENSIONAL IMAGING: AN ITERATIVE RADAR TARGET IMAGING ALGORITHM BASED ON THE MODIFIED EXTENDED PHYSICAL OPTICS METHOD, WHICH IS PROPOSED BY THE HEAD INVESTIGATOR, HAS BEEN PROPOSED AND IMPLEMENTED. IT HAS BEEN SHOWN THAT THE PROFILE, NOT ONLY OF THE ILLUMINATED PORTION BUT ALSO OF THE SHADOWED PORTION OF TARGETS, CAN BE RECONSTRUCTED ADEQUATELY. THE VALIDITY OF THIS METHOD HAS BEEN CONFIRMED BY THE EXPERIMENTS. (2) TWO DIMENSIONAL IMAGING : THE TWO DIMENSIONAL PROFILE OF ARBITRARY CONDUCTING TARGET WAS RECONSTRUCTED BY SYNTHESIZING THE ABOVE ONE DIMENSIONAL RESULTS FOR SEVERAL INCIDENT ANGLES OF ELECTROMAGNETIC PLANE WAVES. THE EFFECTIVENESS OF THIS METHOD HAS BEEN DEMONSTRATED NUMERICALLY. 2. STUDIES ON ELECTROMAGNETIC IMAGING OF UNDERGROUND OBJECTS: (1) ANALYSIS OF TRANSIENT ELECTROMAGNETIC SCATTERING BY UNDERGROUND OBJECTS: THE PROPERTIES OF BISTATIC TRANSIENT SCATTERING FIELDS WHEN DIPOLE ANTENNAS OR LOOP ANTENNAS ARE LOCATED NEAR THE GROUND SURFACE AND AN INFINITE CONDUCTING CYLINDER IS BURIED UNDERGROUND, WERE ANALYZED THEORETICALLY AND EXPERIMENTALLY. IT HAS BEEN SHOWN THAT THE SCATTERED FIELD IS INTERPRETED AS THE COMBINATION OF GEOMETRICAL OPTICS WAVE, LATERAL WAVE AND DIRECT WAVE, DEPENDING ON THE POSITIONS OF THE ANTENNAS, THE OBSERVATION POINT AND THE CYLINDER. NEXT, COMPUTATIONAL CODE FOR ANALYZING THE PROPERTIES OF THE TWO DIMENSIONAL CAVITY-BACKED ANTENNA HAVING THE RADIOWAVE ABSORBER AND THE OVER-ALL PROPERTIES OF THIS SUBSURFACE RADAR DUE TO ARBITRARY BURIED OBJECTS, WAS DEVELOPED. (2) TWO DIMENSIONAL ACTIVE IMAGING OF BURIED CONDUCTING OBJECTS: THE INVESTIGATORS HAVE PROPOSED TWO DIMENSIONAL ACTIVE IMAGING METHOD OF CONDUCTING UNDERGROUND OBJECTS. THE VALIDITY OF THIS METHOD HAS BEEN CONFIRMED BY BOTH NUMERICAL SIMULATIONS AND EXPERIMENTS.
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