l. Introduce of PPP(Precise Point Positioning) Currently, Real-Time Kinematic (RTK) and Precise Point Positioning (PPP) technologies are the most widely and deeply researched technologies for high-precision positioning based on GNSS. RTK technology offers high accuracy, fast convergence, and good dynamic performance. However, it is limited by factors such as baseline length and network availability, and it can be relatively expensive. On the other hand, PPP technology, although slower in convergence compared to RTK, only requires a single receiver for positioning, is not limited by the operational range, and has lower costs. Furthermore, with continuous technological advancements, the accuracy level of PPP has reached a comparable level to RTK. Therefore, PPP has become the preferred choice for high-precision positioning in non...