| 講演要旨(和文) | | マルチチャンネル地中レーダー記録に対しCMP重合を適用し，効果と問題点を議論した．マルチチャンネル記録は相対位置が高品質で保たれることから，CMP重合効果が認められた．しかし，重合数が限定されることから実用上は走査回の異なる記録の重合が必要であり，探査位置精度のさらなる高精度化が求められる．長いオフセットの記録は浅部構造へのs/nが低いため，CMP重合効果は比較的深部に対してのみ望める．地中レーダーのアンテナは波長相当の大きさを有しており，精度向上のためには解析に用いるオフセットの選択方法を確認する必要がある． |
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| | 講演要旨(英文) | | Current ground-penetrating radar (GPR) can simultaneously scan on multi-survey lines with high speed of cars. We discuss effects and important tips to apply 3D processing to GPR data. Offset distances used for processing are discussed and we suggest the nearest distance between corners of two antennas has a possibility to be the optimum distance. CMP records with far offset have low s/n signals for shallow targets. We acquired multi-channel GPR records on a road with a slight slope in PWRI. Reflections from a basement are clearly identified in the sections. Finally, we determined the velocity of 0.08 m/ns is fine for imaging. We applied CMP stacking processing and identified that the continuity of the reflection event and wave form is improved. 3D processing for multi-channel GPR has high possibility to improve the resolution of GPR imaging. |
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