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

生成周期性振动冲击仿真信号，可以仿真滚动轴承等振动冲击信号(Generate periodic vibration impact simulation signals)