卫星升降轨对GNSS-IR海面高度反演的影响  

Influence of satellite ascending and descending orbits on GNSS-IR sea level retrieval

作　　者：卢晓鹏 贺凯飞[2] 侯金华 LU Xiaopeng;HE Kaifei;HOU Jinhua(Huzhou Centre for Spatial Planning and Research,Huzhou,Zhejiang 313000,China;College of Oceanography and Space Informatics,China University of Petroleum(East China),Qingdao,Shandong 266580,China)

机构地区：[1]湖州市空间规划编制与研究中心,浙江湖州313000 [2]中国石油大学(华东)海洋与空间信息学院,山东青岛266580

出　　处：《导航定位学报》2024年第5期36-43,69,共9页Journal of Navigation and Positioning

基　　金：国家自然科学基金面上项目(42174021);山东省自然科学基金面上项目(ZR2021MD060)。

摘　　要：针对在基于信噪比数据的全球卫星导航系统干涉反射测量(GNSS-IR)海面高度反演中,反演精度受多种因素影响,因卫星信号需要连续跟踪的特点,可能导致在低卫星高度角处的升轨与降轨信噪比数据质量不同的问题,探究卫星升降轨对GNSS-IR海面高度反演的影响:给出GNSS-IR原理,并分析卫星升降轨影响;然后通过SC02、AT01测站开展研究。实验结果表明,卫星升降轨的不同会直接导致信噪比振荡效果不同;降轨数据反演结果明显优于升轨数据;2测站因观测环境与设备不同,升降轨的影响也不同,SC02站降轨数据反演精度比升轨数据提升5 cm以上,AT01站降轨数据反演精度比升轨数据提升3 cm以上。因此,在处理GNSS-IR海面高度多频多模反演数据时,卫星升轨与降轨的影响不容忽视。Aiming at the problem that in the global navigation satellite system-interferometric reflectometry(GNSS-IR)sea level retrieval based on signal-to-noise ratio(SNR)data,the retrieval accuracy is affected by many factors,among which the satellite orbit change directly affects the height variation error,however,continuous tracking of satellite signals may lead to different SNR data quality of ascending and descending orbits at low satellite elevation,the paper studied the influence of satellite orbit change on GNSS-IR sea level retrieval:the GNSS-IR principle was given,and the influence of satellite lifting orbit was analyzed;then the data collected from SC02 and AT01 stations were tested.Experimental result showed that satellite orbit change would directly affect the SNR oscillation effect,and the retrieval results of descending orbit would be better than that of ascending orbit;meanwhile,due to different environments and equipment,the influence of ascending and descending orbits would be also different;moreover,the retrieval accuracy of descending data could be improved by more than 5 cm compared to ascending orbit data for SC02 station,and more than 3 cm for AT01 station.Therefore,during processing GNSS-IR sea level multi-frequency and multi-mode retrieval data,the influence of satellite ascending and descending orbits cannot be ignored.

关 键 词：全球卫星导航系统干涉反射测量(GNSS-IR) 信噪比(SNR) 海面高度 升轨 降轨 

分 类 号：P228[天文地球—大地测量学与测量工程]