Influence of the Low-Frequency Error of the Residual Orbit on Recovering Time-Variable Gravity Field from the Satellite-To-Satellite Tracking Mission

When using the dynamic approach to recover time-variable gravity field, reference orbit generated by perturbation model and non-conservative force observed from accelerometer should be introduced at first, then observation equations of residual range rate are established. This introduces a error instrument noise. Thus, there low-frequency errors in rate. Currently, most studies only focus on rate, neglecting influence orbit. Therefore, under condition noise including constant term 1CPR term, formulas derived according characteristics solution Hill equation. Then, residuals is analyzed simulation real data processing respectively. In processing, accuracy recovered field can maintain good consistency for different arc lengths removing Finally, UCAS-IGG (University Chinese Academy Sciences-Institute Geodesy Geophysics) was solved January 2005 February 2010 Compared with official institutions, presents estimating signal. study demonstrates how effect taken into consideration when longer length used field. Using long reduce variables initial state small force.