长波授时附加二次相位因子修正方法

ASF Correction in Long-wave Time Service

附加二次相位因子(ASF)是影响长波授时精度的主要因素,而其理论计算复杂、实测成本太高,不便于工程推广。本文选取华北平原区域为研究范围,提出一种简单高效的ASF修正方法———建立对应的ASF数据网格,采用插值算法进行ASF修正研究。通过对ASF数据网格的验证和分析,得到了和预期效果相一致的实验结果。实验结果表明:建立区域性的ASF数据网格有利于快速地修正ASF误差,便于实际工程应用。

The Additional Secondary Factor （ASF） is the major factor affecting accuracy of long- wave time service, while its theoretical complexity and experimental costs too high, not easy to project promotion. The area of the North China Plain was selected as a research example, and a new method which establish ASF data grid and use interpolation algorithm to study the ASF correction was presented. The results obtained are consistent with expected. The experimental results show that： Established region- al ASF data grid can help quickly correction ASF for practical engineering applications.