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| | Abstract | | Precise positioning is essential for road inspection by vehicle mounted multi-channel GPR to investigate the exact points of the detected anomalies. Although RTK-GNSS is one of the accurate methods to locate the detected anomalies, it requires widely opened sky condition. We have developed the positioning system by combination of RTK-GNSS and differential LDV. Since the LDV sensor enables us to measure a velocity with high accuracy, we can utilize integrated distance as the trigger of GPR measurement. The positioning system uses one more LDV sensor and records the velocities simultaneously, and calculates a traveling track of vehicle from the velocity difference. We conducted a driving experiment using both 2 channel LDV sensor system and RTK-GPS. We calculated the traveling track of the vehicle successfully between the points determined by RTK-FIX solution, with simple corrections. We installed both 2 channel LDV sensor system and RTK-GNSS to newly developed vehicle for GPR surveys. Further developments are needed to improve the positioning accuracy of the combined system. |
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