Volume XLII-3
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3, 723-728, 2018
https://doi.org/10.5194/isprs-archives-XLII-3-723-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-3, 723-728, 2018
https://doi.org/10.5194/isprs-archives-XLII-3-723-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  30 Apr 2018

30 Apr 2018

INSAR UNWRAPPING ERROR CORRECTION BASED ON QUASI-ACCURATE DETECTION OF GROSS ERRORS (QUAD)

Y. Kang1, C. Y. Zhao1,2,3, Q. Zhang1,3, and C. S. Yang1,2 Y. Kang et al.
  • 1School of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China
  • 2State Key Laboratory of Geo-Information Engineering, Xi’an, 710054, China
  • 3National administration of surveying, mapping and geo-information, Engineering research center of national geographic conditions monitoring, Xi’an, 710054, China

Keywords: QUAD, InSAR, Unwrapping Error Correction, Gross Error, L1-norm

Abstract. Unwrapping error is a common error in the InSAR processing, which will seriously degrade the accuracy of the monitoring results. Based on a gross error correction method, Quasi-accurate detection (QUAD), the method for unwrapping errors automatic correction is established in this paper. This method identifies and corrects the unwrapping errors by establishing a functional model between the true errors and interferograms. The basic principle and processing steps are presented. Then this method is compared with the L1-norm method with simulated data. Results show that both methods can effectively suppress the unwrapping error when the ratio of the unwrapping errors is low, and the two methods can complement each other when the ratio of the unwrapping errors is relatively high. At last the real SAR data is tested for the phase unwrapping error correction. Results show that this new method can correct the phase unwrapping errors successfully in the practical application.