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Analysis of Decorrelation Caused by Mast Oscillation in Spaceborne Dual-Antenna InSAR

The antenna mast oscillation in the spaceborne dual-antenna interferometric SAR system will directly degrade the height accuracy. The decorrelation caused by mast oscillation is attributed to the relative shift and the beam centre shift of the outboard antenna. The transfer function of InSAR system and the coherence coefficient considering the effects of mast oscillation are derived. Theoretical and numerical analyses show the influence of amplitude and frequency of mast oscillation oh the coherence of image pair. Finally, the validity of the analysis is demonstrated by the simulation results