| 講演要旨(和文) | | 昨今，複数のアンテナを搭載した地中レーダ装置の普及が進み，3次元記録の取得が容易となった。走査位置をずらして記録を取得すると，さらに高密度の記録の取得が可能となる。高密度3次元記録を作成するためにGNSS記録を空間方向に平均化して走査軌跡の乱れを抑制した。オフセットの異なる記録を用いて速度解析を行い，全記録にNMO補正を適用した。埋設物や路盤境界や浅部の舗装構造の深度分布のイメージングが行えた。 |
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| | 講演要旨(英文) | | Recent ground-penetrating radar (GPR) has several transmitter and receiver antennas and can acquire multi-survey records in a survey scan. We have a future plan to image small scatterers using high dense GPR data. However, the accuracy of GNSS geodetic positions is insufficient to joint two or more sets of survey records acquired in different scans. We show the way to modify initial GNSS positions to spatial smooth locations. We acquired multi-channel GPR records with GNSS measurements on a round test road in PWRI. Our multi-channel records include different offset records and we can estimate RMS velocities for target boundaries. NMO correction was applied for all GPR data using estimated velocities. Reflections from buried pipes and boundaries of road structures are clearly identified in depth slice sections. However, more accurate positioning technology will be desired to joint or stack multi records acquired in different scans. |
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