In order to further improve the orbit determination accuracy of the receiver clock constraint on low Earth orbiter (LEO),the paper proposed an improved precise kinematic orbit determination of LEO by detecting clock-jumps:contraposing the existing frequent ns-level clock jumps in the gravity recovery and climate experiment (GRACE) and GRACE follow-on (GFO) satellites,a robust clock jump detection method and a modified kinematic precise orbit determination (KPOD) method with clock variation constraint were introduced;then GRACE and GFO data of one month were processed to verify the validity of the method.Results showed that there could be up to 208 clock jumps,with a maximum value of approximately 0.7 meters;furthermore,by reducing the weight of clock constraint over epochs with clock jumps in the KPOD,compared to the reduced dynamic orbit of Jet Propulsion Laboratory (JPL),the orbit jumps could be erased.
维普
万方数据