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A New Look at the Bistatic-to-Monostatic Conversion for Tandem SAR Image Formation

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4 Author(s)
Jinshan Ding ; Nat. Key Lab. for Radar Signal Process., Xidian Univ., Xi'an ; Zhenhua Zhang ; Mengdao Xing ; Zheng Bao

The bistatic synthetic aperture radar (SAR) data, which are converted into equivalent monostatic data by proper preprocessing, can be processed by standard monostatic focusing algorithms. The dip moveout (DMO) approach, which is derived from seismic data processing, converts the bistatic data into equivalent monostatic data by a short time-domain Rocca's smile operator. A 2D exact point-target (PT) reference spectrum is derived in this letter for the tandem bistatic configuration. The geometry-based bistatic formulation is shown to be actually equivalent to Rocca's smile operator, although they are derived from the pure SAR and geophysics points of view, respectively. Moreover, the new PT spectrum can be extended to deal with azimuth-invariant bistatic SAR data. Interpretations on the equivalent monostatic range wavenumber are presented in this letter, which help understand the conversion from the radar signal processing viewpoint.

Published in:

IEEE Geoscience and Remote Sensing Letters  (Volume:5 ,  Issue: 3 )