说明：  这是学习RTK算法的重要资料，里面有详细的讲解RTK算法的推导和步骤，这个对设计导航芯片和OEM板有很大用处。相互交流和学习哦
(This is important information to learn RTK algorithms, there are detailed explanations and steps RTK algorithm derivation, the navigation chip design and OEM boards are very useful. Oh mutual exchange and learning)