Akademik Veri Yönetim Sistemi
4th International National Science, Engineering and Material Technologies Conference, Kırklareli, Türkiye, 12 - 14 Eylül 2024, ss.42, (Özet Bildiri)
Products such as highly accurate ortho-image, map and Digital Surface Models (DSM) produced by Unmanned Aerial Vehicles (UAV) are currently being used effectively by many disciplines for different applications. Basically, the accuracy of these products depends on the specifications of the digital camera, Global Navigation Satellite System (GNSS) receiver / antenna and Inertial Measurement Unit (IMU). This criterion is also directly related to the use of the Ground Control Points (GCP) and the homogeneous distribution, which have already been established beforehand on the ground in flight by UAV and whose coordinates are precisely determined. Considering geomatics field applications in recent years, the use of UAVs with Real Time Kinematic (RTK)/Post Processing Kinematic (PPK) GNSS receiver/antenna components has made a significant contribution to the timecost- labor measure of achieving these products with high accuracy. Taking this development into consideration, the real-time and post-processing analysis of GNSS data in UAV is of great importance for ortho-images and DSM products. Traditionally, GNSS post-measure data evaluation and analysis (Post Processing Kinematic-PPK) is performed using relative positioning techniques. All GNSS techniques based on the relative positioning principle require simultaneous measurements at one or more reference points whose coordinates are known. Measurements must be made at least simultaneously on two points, one which’s coordinates are unknown, and on another point, which’s coordinates are known and can be referred as reference point, with at least 2 GNSS receivers. On the other hand, the availability of precise satellite orbit and clock information via the global, regional and local infrastructure of fixed GNSS stations networks that have been constantly observing in recent years has also led to the development of new positioning algorithms for GNSS. In this context, the Precise Point Positioning (PPP) technique, which is based on the absolute positioning principle, has emerged as an important alternative to determine the relative position. The PPP technique, in which a single GNSS receiver is sufficient for positioning, is a technique that ensures high positional accuracy in absolute terms. In this study, it is aimed to perform tasks that analyzes the raw GNSS data obtained from the flights to be made with the UAV with the PPP method and integrates it with the IMU data to provide higher location accuracy. Thus, it is provided to eliminate the need for simultaneous reference stations of relative positioning techniques, which are widely used in today's UAV photogrammetry applications such as RTK and PPK.