Performance Comparison of KOMPSAT-5 Precision Orbit Determination with GRACE

Table 1

POD schemes for both KOMPSAT-5 and GRACE satellites.

Observation type	L3 (ionosphere-free combination)
Data arc	24 hours
Sampling interval	30 seconds
Attitude file, phase center offset, and variation	Not applied
Elevation cutoff angle	5°
Earth orientation parameters and the orbits of the GPS satellites	Final products from Center for Orbit Determination in Europe (CODE) [15]
Geopotential model	Gravity (EGM2008); Ocean tide (FES2004) [16]
Planetary ephemeris	Planetary ephemeris (DE405) [16]
Estimation parameters	Six osculating elements, three constant empirical accelerations, and a pseudostochastic pulse—piece-wise constant acceleration in the radial, along-track, and cross-track directions—for every 6 min. (empirical acceleration and pseudostochastic pulse are only applied to the reduced dynamic method)