精密单点定位程序，对于电离层、对流层、双频观测值改正等有较强的改正作用

卫星间测距，采用伪码测距与双频测距相结合的方式，使得定位精度哟很大提高-Inter-satellite ranging, distance measurement with dual-band pseudo-code combination of distance, making the positioning accuracy greatly improved yo