TY - EJOU
AU - Gao, Y,ong
AU - Zhang, Shubi
AU - Zhang, Kefei
AU - Li, Shijin
TI - Frequency Domain Filtering SAR Interferometric Phase Noise Using the Amended Matrix Pencil Model
T2 - Computer Modeling in Engineering \& Sciences
PY - 2019
VL - 119
IS - 2
SN - 1526-1506
AB - Interferometric phase filtering is one of the key steps in interferometric synthetic aperture radar (InSAR/SAR). However, the ideal filtering results are difficult to obtain due to dense fringe and low coherence regions. Moreover, the InSAR/SAR data range is relatively large, so the efficiency of interferential phase filtering is one of the major problems. In this letter, we proposed an interferometric phase filtering method based on an amended matrix pencil and linear window mean filter. The combination of the matrix pencil and the linear mean filter are introduced to the interferometric phase filtering for the first time. First, the interferometric signal is analyzed, and the interferometric phase filtering is transformed into a local frequency estimation problem. Then, the local frequency is estimated using an amended matrix pencil at a window. The local frequency can represent terrain changes, thus suggesting that the frequency can be accurately estimated even in dense fringe regions. Finally, the local frequency is filtered by using a linear window mean filter, and the filtered phase is recovered. The proposed method is calculated by some matrices. Therefore, the computational complexity is reduced, and the efficiency of the interferometric phase filtering is improved. Experiments are conducted with simulated and real InSAR data. The proposed method exhibits a better filtering effect and an ideal efficiency as compared with the traditional filtering method.
KW - Interferometric phase filtering
KW - interferometric synthetic aperture radar
KW - local frequency estimation
KW - amended matrix pencil
KW - linear window mean filter
DO - 10.32604/cmes.2019.03943