Analysis of the characteristics of the harmonics coefficient J 2 of the Earth’s gravity field in different periods

Abstract

The characteristics of the geopotential coefficient 2 J in different periods are analyzed using satellite laser ranging data spanning the last 27 years. The satellites used in the analysis are Lageos1 and Lageos2. The variations in 2 J are obtained by determining the dynamic orbit. The results show that there are strong seasonal and long-term variations. For different data spans, the seasonal variations agree well in terms of both amplitude and phase. Using all the data, the amplitude and phase of the annual term are 2.5  10 -10 and 127°, respectively, while the amplitude and phase of the semiannual term are 0.94  10 -10 and 213°, respectively. In the case of long-term variation, the secular variation in 2

Precise orbit determination of Haiyang-2 using satellite laser ranging

“…Besides its role in orbit determination, SLR data have been widely used in scientific studies. Scientists, including many Chinese researchers, have developed and will explore the functions of high-precision SLR observations in the fields of astrometry, astro-geodynamics and geophysics [8][9][10][11]. In this work, we summarize the current SLR observation on HY-2, derive its precise orbit by adopting dynamic orbit determination techniques, and assess the orbit precision in different ways including internal accuracy evaluation, comparison with the DORIS medium orbit ephemeris (MOE), and independent SLR station-satellite ranging validation.…”