PHASE UNWRAPPING CORRECTION WITH DUAL-BASELINE DATA FOR THE TANDEM-X MISSION

The operational dual-baseline phase unwrapping algorithm for the TanDEM-X mission is based on a combination of separate single-baseline phase unwrapping and a correction procedure of different levels of complexity. It benefits from all the information available from the two TanDEM-X acquisitions by computing a differential interferogram to obtain a more reliable unwrapped phase. This may still be prone to phase unwrapping errors, but these can be mitigated using a stereo-radargrammetric measurement. Hence, the resulting dual-baseline phase unwrapping algorithm outperforms a single-baseline one. Index Terms — phase unwrapping, TanDEM-X, differential interferogram, stereo-radargrammetr