能实现GPS伪距单点定位，包括文件的读写、误差改正、卫星位置、钟差的计算，以及最终伪距定位的实现。误差在10m以内,Can achieve single-point pseudorange GPS positioning, including reading and writing files, error correction, satellite position, clock bad calculation, and finally achieve pseudorange position

GPS卫星钟差预报模型的精度评定，如：线性拟合模型、带有周期项的线性拟合模型、二次项拟合模型、带有周期项的二次项拟合模型等。-Accuracy Evaluation GPS satellite clock error prediction model, such as: linear fitting model, linear fitting model with periodic term, quadratic fitting model, fitted with a quadratic te