Zero-difference and single-difference precise orbit determination for LEO using GPS  

作　　者：PENG DongJu WU Bin 

机构地区：[1]Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China [2]Graduate University of Chinese Academy of Sciences, Beijing 100049, China

出　　处：《Chinese Science Bulletin》2007年第15期2024-2030,共7页

摘　　要：Various methods for precise orbit determination (POD) of low earth orbiters (LEO) are briefly intro-duced in this paper. Based on the software named SHORD-Ⅲ developed by our institute,sin-gle-difference (SD) and zero-difference (ZD) dynamic POD based on LEO carrying an on-board GPS receiver is mainly discussed. The approaches are tested using real GRACE data (November 5―25,2002) and independently validated with Satellite Laser Ranging (SLR) measurements over the same 21 days. Comparisons with the scientific orbits provided by GFZ indicate that the SD POD RMS accuracy can achieve 5,10 and 6 cm in radial,along and cross the track,and the ZD POD RMS accuracy can achieve 4,8 and 4 cm in radial,along and cross the track. SLR validation shows that SD POD accuracy is better than 8 cm in distance,and ZD POD accuracy is better than 6 cm.Various methods for precise orbit determination （POD） of low earth orbiters （LEO） are briefly introduced in this paper. Based on the software named SHORD-III developed by our institute, single-difference （SD） and zero-difference （ZD） dynamic POD based on LEO carrying an on-board GPS receiver is mainly discussed. The approaches are tested using real GRACE data （November 5-25, 2002） and independently validated with Satellite Laser Ranging （SLR） measurements over the same 21 days. Comparisons with the scientific orbits provided by GFZ indicate that the SD POD RMS accuracy can achieve 5, 10 and 6 cm in radial, along and cross the track, and the ZD POD RMS accuracy can achieve 4, 8 and 4 cm in radial, along and cross the track. SLR validation shows that SD POD accuracy is better than 8 cm in distance, and ZD POD accuracy is better than 6 cm.

关 键 词：低轨卫星 精确轨道测量 单一微分 零微分 GPS 全球定位系统 

分 类 号：P228.4[天文地球—大地测量学与测量工程]