For real-time precise orbit determination (POD) of low earth orbit (LEO) satellites, high-accuracy global navigation satellite system (GNSS) orbit and clock products are necessary in real time. Recently, the Japanese multi-GNSS advanced demonstration of orbit and clock analysis precise point positioning (PPP) service and the new generation of the Australian/New Zealand satellite-based augmentation system (SBAS)-aided PPP service provide free and precise GNSS products that are directly broadcast through the navigation and geostationary earth orbit satellites, respectively. With the high quality of both products shown in this study, a 3D accuracy of centimeters can be achieved in the post-processing mode for the reduced-dynamic orbits of small LEO satellites having a duty cycle down to 40% and at sub-dm to dm level for the kinematic orbits. The results show a promising future for high-accuracy real-time POD onboard LEO satellites benefiting from the precise free-of-charge PPP corrections broadcast by navigation systems or SBAS.

对于低地球轨道（LEO）卫星的实时精确轨道确定（POD），需要实时的高精度全球导航卫星系统（GNSS）轨道和时钟产品。最近，日本多GNSS先进的轨道和时钟分析精确点定位（PPP）服务演示以及新一代的澳大利亚/新西兰基于卫星的增强系统（SBAS）辅助的PPP服务提供了免费且精确的GNSS产品，分别通过导航和对地静止地球轨道卫星直接广播。由于这项研究显示的两种产品均具有高品质，因此对于占空比低至40％，亚分米至1dm的小型LEO卫星，在动态处理后的轨道上，可以在后处理模式下实现厘米级的3D精度。运动轨道的dm级别。