中文摘要：

对历元差分电离层模型（SEID）进行了改进,给出了在地面处建模与在所假定电离层薄层处建模差异量的精确计算公式,发现了可利用多个双频动态参考站（动态参考网）进行建模这一实用特性,并以此提出了一套基于动态参考网的单频接收机精密单点定位数据处理方法。实验结果表明,即使对于电离层活跃性较强且范围为100km×100km的测区,利用3个以上双频动态参考站的观测数据,便能为测区内单频接收机用户提供平面方向精度优于5cm的动态精密单点定位服务。

英文摘要：

We developed a new method of single-frequency precise positioning for the users in a large region. Compared with current methods, this new method avoids selecting designated static reference network, it has been proved to be effectively modeled on the ground instead of be modeled at 350 km above the ground （as is shown by SEID）, and the calculation of the maximum-modeling difference is also given. The results show that for an ionosphere-active region of 100 km× 100 km, where there are at least 3 dynamic reference stations, user can get cm-level position accuracy in the horizontal direction with 20 minutes observation data. Furthermore, this method provides a new way on the research of single-frequency precise po- sitioning.