To resolve undifferenced GNSS phase ambiguities, dedicated satellite products are needed, such as satellite orbits, clock offsets and biases. The International GNSS Service CNES/CLS analysis center provides satellite (HMW) Hatch-Melbourne-Wübbena bias and dedicated satellite clock products (including satellite phase bias), while the CODE analysis center provides satellite OSB (observable-specific-bias) and integer clock products. The CNES/CLS GPS satellite HMW bias products are determined by the Hatch-Melbourne-Wübbena (HMW) linear combination and aggregate both code (C1W, C2W) and phase (L1W, L2W) biases. By forming the HMW linear combination of CODE OSB corrections on the same signals, we compare CODE satellite HMW biases to those from CNES/CLS. The fractional part of GPS satellite HMW biases from both analysis centers are very close to each other, with a mean Root-Mean-Square (RMS) of differences of 0.01 wide-lane cycles. A direct comparison of satellite narrow-lane biases is not easily possible since satellite narrow-lane biases are correlated with satellite orbit and clock products, as well as with integer wide-lane ambiguities. Moreover, CNES/CLS provides no satellite narrow-lane biases but incorporates them into satellite clock offsets. Therefore, we compute differences of GPS satellite orbits, clock offsets, integer wide-lane ambiguities and narrow-lane biases (only for CODE products) between CODE and CNES/CLS products. The total difference of these terms for each satellite represents the difference of the narrow-lane bias by subtracting certain integer narrow-lane cycles. We call this total difference “narrow-lane” bias difference. We find that 3% of the narrow-lane biases from these two analysis centers during the experimental time period have differences larger than 0.05 narrow-lane cycles. In fact, this is mainly caused by one Block IIA satellite since satellite clock offsets of the IIA satellite cannot be well determined during eclipsing seasons. To show the application of both types of GPS products, we apply them for Sentinel-3 satellite orbit determination. The wide-lane fixing rates using both products are more than 98%, while the narrow-lane fixing rates are more than 95%. Ambiguity-fixed Sentinel-3 satellite orbits show clear improvement over float solutions. RMS of 6-h orbit overlaps improves by about a factor of two. Also, we observe similar improvements by comparing our Sentinel-3 orbit solutions to the external combined products. Standard deviation value of Satellite Laser Ranging residuals is reduced by more than 10% for Sentinel-3A and more than 15% for Sentinel-3B satellite by fixing ambiguities to integer values.

为了解决无差异的 GNSS 相位模糊，需要专用的卫星产品，例如卫星轨道、时钟偏移和偏差。国际GNSS服务CNES/CLS分析中心提供卫星（HMW）Hatch-Melbourne-Wübbena偏差和专用卫星时钟产品（包括卫星相位偏差），而CODE分析中心提供卫星OSB（observable-specific-bias）和整数时钟产品。CNES/CLS GPS 卫星 HMW 偏差产品由 Hatch-Melbourne-Wübbena (HMW) 线性组合确定，并聚合代码 (C1W, C2W) 和相位 (L1W, L2W) 偏差。通过对相同信号形成 CODE OSB 校正的 HMW 线性组合，我们将 CODE 卫星 HMW 偏差与 CNES/CLS 的偏差进行了比较。来自两个分析中心的 GPS 卫星 HMW 偏差的小数部分彼此非常接近，平均均方根 (RMS) 差异为 0.01 宽车道周期。卫星窄道偏差的直接比较不容易实现，因为卫星窄道偏差与卫星轨道和时钟产品以及整数宽道模糊度相关。此外，CNES/CLS 不提供卫星窄道偏差，而是将它们合并到卫星时钟偏移中。因此，我们计算了 CODE 和 CNES/CLS 产品之间的 GPS 卫星轨道、时钟偏移、整数宽车道模糊度和窄车道偏差（仅适用于 CODE 产品）的差异。每颗卫星的这些项的总差异表示通过减去某些整数窄通道周期而产生的窄通道偏差的差异。我们称这种总差异为“窄车道”偏差差异。我们发现，在实验时间段内，来自这两个分析中心的 3% 的窄通道偏差的差异大于 0.05 个窄通道循环。事实上，这主要是由一颗 Block IIA 卫星造成的，因为 IIA 卫星的卫星时钟偏移在月食季节无法很好地确定。为了展示这两种类型的 GPS 产品的应用，我们将它们应用于 Sentinel-3 卫星轨道确定。两种产品的宽线定影率均在98%以上，窄线定影率均在95%以上。模糊度固定的 Sentinel-3 卫星轨道明显优于浮动解决方案。6 小时轨道重叠的 RMS 提高了大约两倍。还，通过将我们的 Sentinel-3 轨道解决方案与外部组合产品进行比较，我们观察到了类似的改进。通过将模糊度固定为整数值，Sentinel-3A 卫星激光测距残差的标准偏差值降低了 10% 以上，Sentinel-3B 卫星降低了 15% 以上。