RTKLIB的定位功能主要为PPP以及相对定位，需要指出的是PPP模式提供模糊度固定功能。RTKLIB的核心函数是rtkpos。不管采用实时还是事后的处理方式，均通过rtkpos函数实现，换句话说，rtkpos为单历元处理函数。-RTKLIB positioning function mainly for the PPP and relative positioning, it should be pointed out that the PPP mode provides fixed degree of ambiguity. The core function of RTKLIB is rtkpos. Whether using real-time or post-processing, are achieved through rtkpos function, in other words, rtkpos single epoch processing function.