Aas 11-502 Gravity Error Compensation Using Second-order Gauss-markov Processes
نویسندگان
چکیده
Earth science satellite missions currently require orbit determination solutions with position accuracies to within a centimeter. The estimation of empirical accelerations has become commonplace in precise orbit determination (POD) for Earth-orbiting satellites. Dynamic model compensation (DMC) utilizes an exponentially time-correlated system noise process, known as a first-order GaussMarkov process (GMP1) to estimate un-modeled accelerations. In this work, we address the use of a second-order Gauss-Markov process to compensate for higher order spherical harmonic gravity accelerations, beyond J3. Improvements in POD and orbit prediction through the implementation of an optimal GMP2 for empirical acceleration estimation are assessed. The use of a single well calibrated GMP2 outperformes a GMP1 and a poorly calibrated GMP2 for both continuous observations and poor tracking data.
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