When using Global Navigation Satellite System (GNSS) measurements, Precise Point Positioning with Ambiguity Resolution (PPP-AR) has been a popular substitute for relative positioning in geoscience applications. Compared with the Fractional Cycle Biases (FCB) method, the processing of Integer Recovery Clocks (IRC) products estimate, especially for ambiguity datum fixing, is so complex that its application has been greatly limited. Based on the concept of “carrier range”, we introduce an efficient way to implement the IRC method, termed as the alternative IRC method in this paper. In this method, the fixed ambiguities derived from PPP-AR using the FCB method, and not a fixed-ambiguity datum, are fixed in the IRC products estimate. This greatly reduces the complexity of implementing the IRC method and does not influence the accuracy of positioning. The alternative IRC method outperforms the FCB method by corroborating the consistency of daily positions in nature with international GNSS service weekly solution. To confirm this improvement, global positioning system measurements acquired over a year (2016) from approximately 500 globally distributed stations were processed. The accuracy of IRC products is approximately 20 ps and is highly stable for this year. Moreover, comparing the positioning accuracy of the FCB method to the alternative IRC method, we find that the mean root mean square over the year falls evidently from 2.03 to 1.65 mm at the east component. Therefore, we suggest that the alternative IRC method should be implemented when estimate IRC products.

中文翻译：

---

另一种整数恢复时钟方法，用于以歧义分辨率进行精确点定位

当使用全球导航卫星系统（GNSS）测量时，具有歧义分辨率的精确点定位（PPP-AR）已成为地球科学应用中相对定位的流行替代方法。与分数周期偏差（FCB）方法相比，整数恢复时钟（IRC）产品估计的处理非常复杂，尤其是对于歧义数据固定而言，其应用受到很大限制。基于“载波范围”的概念，我们介绍了一种有效的实现IRC方法的方法，本文将其称为替代IRC方法。在这种方法中，IRC产品估算中固定了使用FCB方法从PPP-AR衍生的固定歧义，而不是固定歧义数据。这大大降低了实现IRC方法的复杂性，并且不影响定位的准确性。替代IRC方法通过与国际GNSS服务每周解决方案一起确认自然界中日常位置的一致性，胜过FCB方法。为了确认这一改进，我们处理了一年（2016年）从全球约500个分布式站点获得的全球定位系统测量结果。IRC产品的精度约为20 ps，并且今年非常稳定。此外，通过将FCB方法与替代IRC方法的定位精度进行比较，我们发现一年中的平均均方根在东部部分明显从2.03下降到1.65 mm。因此，我们建议在估算IRC产品时应采用替代IRC方法。