Abstract: The relative motion features between satellite and strictlyregressive reference orbit were investigated to build a tubenavigation method of remotesensing satellite. Since the reference orbit was designed only with the high precision nonspherical perturbation, it had a different dynamic environment with the satellite in space, leading an excursion in alongtrack direction. An alongtrack aligning algorithm was introduced to get rid of the excursion in alongtrack direction based on high precision orbit dynamic model and position sampling method, by which the phasetime excursion and relative motion trajectory were determined. The direct least squares fitting method was introduced to achieve the features of relative motion trajectory. The study on tubenavigation can be applied to autonomous groundtrack keeping of satellites with GNSS measurements.

Key words: strictlyregressive orbit, tubenavigation, alongtrack aligning, relative motion trajectory, phasetime excursion