Highly Accurate DSM Reconstruction Using Ku-Band Airborne InSAR

    •  Okada, Y.; Hirao, C.; Horiuchi, T.; Hara, Y.; Yedidia, J.S.; Azarbayejani, A.; Oishi, N., "Highly Accurate DSM Reconstruction Using Ku-band Airborne InSAR", IEEE International Geoscience and Remote Sensing Symposium (IGARSS), ISBN: 978-1-4244-1211-2, July 2007, pp. 5049-5052.
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      • @inproceedings{Okada2007jul,
      • author = {Okada, Y. and Hirao, C. and Horiuchi, T. and Hara, Y. and Yedidia, J.S. and Azarbayejani, A. and Oishi, N.},
      • title = {Highly Accurate DSM Reconstruction Using Ku-band Airborne InSAR},
      • booktitle = {IEEE International Geoscience and Remote Sensing Symposium (IGARSS)},
      • year = 2007,
      • pages = {5049--5052},
      • month = jul,
      • isbn = {978-1-4244-1211-2},
      • url = {}
      • }
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TR Image
Factor graph used in MERL's phase-unwrapping algorithm to define the probability of an unwrapped configuration of phases and integer shifts.

We present a newly developed airborne InSAR system incorporating a novel phase unwrapping algorithm, capable of retrieving a highly accurate Digital Surface Model (DSM). The SAR sensor system, with a spatial resolution of 30 cm, is carried on an airborne platform which has two antennas placed at a baseline length of 1 meter. We have established a DSM reconstruction processing technique, which includes the new "Iterated Conditional Modes-Minimum Cost Flow" (ICM-MCF) phase-unwrapping algorithm. The ICM-MCF algorithm finds a locally optimal configuration of unwrapped phases under a well-characterized statistical model of the terrain and noise. An experimental field observation was carried out in Tsukuba, Japan. The DSM was generated, and the height accuracy of the SAR-DSM was evaluated by comparing with laser pro-filer data. For 50 cm X 50 cm mesh an accuracy of better than 50 cm in height was confirmed.