VBS-RTK GPS輔助單旋翼UAS熱影像定位定向.

Thermal infrared images can show the temperature change of objects that represent the significant characteristics, therefore they have been applied on many fields. With the development of UAS (Unmanned Aircraft Systems), the thermal infrared camera can be carried on the Helicopter UAS to collect thermal images with high resolution in a local area more efficiently. However, the ground control marks for thermal images are uneasy to be set up. In this study, the Trimble BD970 GNSS OEM board was carried on the Helicopter UAS to collect Global Positioning System (GPS) data and the bundle adjustment fbr the positioning and orientation of collected thermal images, i.e., AT (Aerial Triangulation), was supported by Virtual Base Station--Real Time Kinematic (VBS-RTK) GPS technique. In theory, the GPS antenna offset is not changed and can be viewed as constant. Therefore, in this study, the new model based on bundle adjustment was developed to solve GPS antenna offset, exterior orientation parameters and the object coordinate of tie points simultaneously by unified least squares adjustment. Besides, thermal infrared camera is a non-metric camera. In order to acquire high precision camera parameters for AT, thermal infrared camera was calibrated by field method. In this study, due to the bad accuracy of GPS observations in real data collection, the GPS antenna offset could be not solved. Although the accuracy of GPS observations was bad, the GPS observations could also be used to support the bundle adjustment for the positioning and orientation of thermal images under better block geometry and ground control points still could be reduced. [ABSTRACT FROM AUTHOR]