In this paper, a real-time calibration method for relative alignments between multiple heads star tracker (MHST) heads
based on the invariability of inter-star angle principle is presented. Firstly, the ill effects of relative misalignments on
accuracy of MHST attitude based on star-fusion are analyzed. Then, the invariability of inter-star angle principle and the
changing feature of relative alignments are applied to build a kalman filtering model to estimate the errors. Finally, a
simulation is used to illustrate that the method meets well the real-time requirement of accurate relative alignments of
MHST.
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