Estimation of COSMIC LEO satellite GPS receiver differential code bias

作者：Zhang Xiao-Hong^*; Tang Long

来源：Acta Geophysica Sinica, 2014, 57(2): 377-383.

DOI：10.6038/cjg20140204

• COSMIC satellites
• Ionosphere
• Total electron content
• Receiver differential code bias

GPS receiver differential code bias (DCB) is an important error source in inversing ionospheric total electron content (TEC) using COSMIC LEO satellite observations. In this paper, the ionosphere above COSMIC satellite orbit altitude is assumed to be concentrated on a single layer and the TEC is parameterized using spherical harmonic expansion, and then we estimate the ionospheric spherical harmonic coefficients and DCB parameters with least square method. The entire COSMIC GPS receiver DCBs in December 2012 are calculated and compared to the products provided by COSMIC Data Analysis and Archival Center (CDAAC). The result shows that estimated receiver DCBs match better with CDAAC products: the variation trend of DCBs is similar, the RMS of DCBs differences is lower than 2 TECU and maximum absolute difference is less than 3 TECU in December 2012. In addition, the estimated errors of receiver DCBs calculated in this paper are mainly distributed in 0. 2 similar to 0. 4 TECU suggesting the inner precision is higher.

• 出版日期2014-2
• 单位武汉大学