The shipboard navigation system on the spaceflight ship is made up of strapdown inertial navigation system (SINS) and GNSS. The experiments of the evaluation of SINS’s attitude error and the differential service functions of StarFire star-station were carried out by using the method of data evaluation to analyze the data accuracy after start-up of SINS, the system positioning accuracy after differential service interruption and the data convergence time after differential service recovery respectively. Based on the above data analysis results, a rough conclusion of data availability during start-up and running process of navigation equipment is proposed.
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