基于国产ARM架构CPU的导航卫星精密定轨解算效率优化方法

Efficiency Optimization Method of Precise Orbit Determination for Navigation Satellites Based on Domestic ARM Architecture CPU

以国产飞腾CPU为例,讨论在国产ARM架构CPU基础上的导航卫星精密定轨解算效率优化方法。基于导航卫星精密定轨解算流程中钟差约化和法方程求逆耗时较多,分别利用多线程和OpenBlas对上述2个过程进行优化。结果表明,优化后解算效率大幅提升。钟差约化方面,采用100个测站32颗导航卫星进行解算时,原始单历元平均耗时1.105 s,优化后为0.188 s;法方程求逆方面,原始求逆平均耗时2 264 s,优化后仅需78 s。

Taking the domestic Feiteng CPU as an example,we discuss the efficiency optimization methods of precise orbit determination for navigation satellites based on domestic ARM architecture CPU.Firstly,based on the precise orbit determination process for navigation satellites,we identify the reduction of clock errors and the inverse computation of normal equations as the main time-consuming steps.Secondly,we use multi-threaded and OpenBlas to optimize the two steps separately.The results show that the optimization significantly improves computational efficiency.In terms of clock error reduction,when solving for 100 stations and 32 navigation satellites,the original average time consuming of each epoch is 1.105 s,which is reduced to 0.188 s after optimization.In terms of the inverse computation of normal equations,the original average time consuming is 2264 s,which is reduced to only 78 s after optimization.