IGS超快星历在对流层实时监测中的应用研究

通过比较广播星历和IGS（国际GPS服务机构）目前提供的3种精密星历的精度和时延性，得出只有超快星历（IGU）才能满足对流层监测的时间要求．根据实际数据进一步分析了超快星历卫星轨道和卫星钟差的精度，提出了利用轨道松弛联合轨道质量指数加权的方法，并利用四川GPS连续观测网（GPSNOS）的实测数据进行了检验．结果表明，此方法可以解决IGU中的“病态”卫星问题，从而使IGU能有效地用于对流层实时监测．

Application of IGS Ultra Rapid Products to Real-Time Tropospheric Monitoring

Through comparing the accuracy and latency of broadcast ephemeris and three kinds of precise ephemeris provided by IGS(the International GPS Service),it was found that only IGS ultra rapid products(IGU) can meet the need for time of tropospheric monitoring.Based on the above recognition and by analyzing the precision of satellite orbits and clocks of IGU,a method integrating orbit relaxation with orbit quality index weighting was proposed and tested using data from four GPS reference stations in GPSNOS(GPS reference station network of Sichuan).The tested result shows that the proposed method can solve the uncertainty of IGU to effectively apply IGU to real-time tropospheric monitoring.