International GNSS Service

The IGS global system of satellite tracking stations, Data Centers, and Analysis Centers puts high-quality GPS data and data products on line in near real time to meet the objectives of a wide range of scientific and engineering applications and studies. The IGS collects, archives, and distributes GPS observation data sets of sufficient accuracy to satisfy the objectives of a wide range of applications and experimentation. These data sets are used by the IGS to generate the data products mentioned above which are made available to interested users through the Internet. In particular, the accuracies of IGS products are sufficient for the improvement and extension of the International Terrestrial Reference Frame (ITRF), the monitoring of solid Earth deformations, the monitoring of Earth rotation and variations in the liquid Earth (sea level, ice-sheets, etc.), for scientific satellite orbit determinations, ionosphere monitoring, and recovery of precipitable water vapor measurements.

国际地球自转服务（IGS）的全球卫星跟踪站、数据中心和分析中心系统，将高质量的GPS数据和数据产品以近乎实时的方式上线，以满足广泛科学和工程应用及研究的需要。IGS负责收集、存档并分发足以满足各类应用和实验需求的GPS观测数据集。这些数据集被IGS用于生成上述数据产品，并通过互联网向感兴趣的用户提供。特别是，IGS产品的精度足以用于国际大地测量参考框架（ITRF）的改进与扩展、固体地球形变的监测、地球自转及其在液态地球（海平面、冰盖等）中的变化的监测、科学卫星轨道的确定、电离层监测以及可降水量蒸气的恢复测量。