GNSS-RTK POSITIONING UNDER CANOPIES OF TREES

Mohd Zahirudin Bin Mohammed Na’aim





ABSTRACT

Global Navigation Satellite System (GNSS) Real-Time Kinematic (RTK) positioning is highly efficient and accurate when there are no obstacles between the GNSS satellites and the GPS antenna, providing centimeter-level accuracy. However, when the visibility to the satellites is limited due to trees, or other obstructions, GNSS operators can indeed encounter challenges related to ambiguity resolution and validation. Real-Time Kinematic (RTK) positioning under canopy environments, where tree cover can obstruct GNSS signals and introduce multipath errors, presents unique challenges. These challenges can result in difficulties in obtaining accurate and reliable position information. This study was conducted with the aim of determining the coordinates and elevation for control point under canopies of trees through the GNSS-RTK measurement method. The coordinates obtained using GNSS RTK method during the experiment were compared to the coordinates determined by the conventional survey methods. The study results showed that it is possible to determine the coordinates and elevation of points under canopies of tree conditions with the accuracy of a few centimeters.


Keywords:

 GNSS-RTK, Canopy, Control Point