Solar radiation pressure (SRP) is the dominant non-gravitational perturbation for GPS satellites. In the IGS (International GNSS Service), this perturbation is modeled differently by individual analysis centers (ACs). The two most widely used methods are the Empirical CODE orbit Model (ECOM, ECOM2) and the JPL GSPM model. When using ECOM models, a box-wing model or other a priori models, as well as stochastic pulses at noon or midnight, are optionally adopted by some ACs to compensate for the deficiencies of the ECOM or ECOM2 model. However, both box-wing and GSPM parameters were published many years ago. There could be an aging effect going with time. Also, optical properties and GSPM parameters of GPS Block IIF satellites are currently not yet published. In this contribution, we first determine Block-specific optical parameters of GPS satellites using GPS code and phase measurements of 6 years. Various physical effects, such as yaw bias, radiator emission in the satellite body-fixed − X and Y directions and the thermal radiation of solar panels, are considered as additional constant parameters in the optical parameter adjustment. With all the adjusted parameters, we form an enhanced box-wing model adding all the modeled physical effects. In addition, we determine Block-specific GSPM parameters by using the same GPS measurements. The enhanced box-wing model and the GSPM model are then taken as a priori model and are jointly used with ECOM and ECOM2 model, respectively. We find that the enhanced box-wing model performs similarly to the GSPM model outside eclipse seasons. RMSs of all the ECOM and ECOM2 parameters are reduced by 30% compared to results without the a priori model. Orbit misclosures and orbit predictions are improved by combining the enhanced box-wing model with ECOM and ECOM2 models. In particular, the improvement in orbit misclosures for the eclipsing Block IIR and IIF satellites, as well as the non-eclipsing IIA satellites, is about 25%, 10% and 10%, respectively, for the ECOM model. Therefore, the enhanced box-wing model is recommended as an a priori model in GPS satellite orbit determination.

太阳辐射压力（SRP）是GPS卫星的主要非重力扰动。在IGS（国际GNSS服务）中，此干扰由各个分析中心（AC）进行了不同的建模。两种使用最广泛的方法是经验代码轨道模型（ECOM，ECOM2）和JPL GSPM模型。当使用ECOM模型时，一些AC可以选择采用盒翼模型或其他先验模型，以及中午或午夜的随机脉冲来补偿ECOM或ECOM2模型的不足。但是，箱形翼和GSPM参数都已经发布了很多年。随着时间的流逝可能会产生衰老效应。另外，GPS Block IIF卫星的光学特性和GSPM参数目前尚未发布。在这项贡献中，我们首先使用GPS代码和6年的相位测量来确定GPS卫星的块特定光学参数。在光学参数调整中，各种物理效应（例如偏航偏置，固定在卫星人体的X和Y方向上的辐射器辐射以及太阳能电池板的热辐射）被视为附加的常数参数。通过所有调整后的参数，我们形成了一个增强的箱形翼模型，其中添加了所有建模的物理效果。此外，我们通过使用相同的GPS测量来确定特定于块的GSPM参数。然后，将增强型机翼模型和GSPM模型作为先验模型，分别与ECOM和ECOM2模型结合使用。我们发现，增强型机翼模型在月食季节以外的性能类似于GSPM模型。与没有先验模型的结果相比，所有ECOM和ECOM2参数的RMS均降低了30％。通过将增强的箱形机翼模型与ECOM和ECOM2模型相结合，可以改善轨道错位和轨道预测的情况。特别是，对于ECOM模型，遮盖IIR卫星和IIF遮盖卫星以及IIA非遮盖卫星的闭轨改善分别约为25％，10％和10％。因此，建议将增强的箱翼模型作为GPS卫星轨道确定中的先验模型。对于ECOM模型，IIA卫星和无遮盖的IIA卫星分别约为25％，10％和10％。因此，建议将增强的箱翼模型作为GPS卫星轨道确定中的先验模型。对于ECOM模型，IIA卫星和无遮盖的IIA卫星分别约为25％，10％和10％。因此，建议将增强的箱翼模型作为GPS卫星轨道确定中的先验模型。