In this paper, model-based (surface, dihedral and volume scattering) target decomposition technique is proposed to decompose the π/4 mode compact polarimetric radar data. A general relationship between fully polarimetric coherence matrix and the Stokes vector of the π/4 mode compact polarimetric data is first established. Based on the Stokes vector, a proposed algorithm to retrieve the power of three scattering mechanisms is given in details. We validate this algorithm with L-band AIRSAR, San Francisco Bay, and results of decomposition are discussed and assessed in detail by being compared with the quad-pol Freeman-Durden decomposition results. Finally, the π/4 mode decomposition is compared with the CTLR (circular transmitting and linear reeving) mode, and with the π/4 mode m − δ targets decomposition. The comparison results are analyzed and discussed in detail. Keywords π/4 mode compact polarimetry, mode-based target decomposition, Stokes vector, RVoG model, radar polarimetry Citation Guo S L, Li Y, Hong W, et al. Model-based target decomposition with the π/4 mode compact polarimetry data.

In this paper, the slant range error introduced by the "stop-and-go" assumption is analyzed in detail. Owing to the high orbit and long synthetic aperture time of geosynchronous SAR (Geo-SAR), the slant range error introduced by the "stop-and-go" assumption should be considered. In addition, an accurate signal propagation delay time equation of Geo-SAR based on circle orbit is presented, and the error of the "stop-andgo" assumption is demonstrated by simulation. An "equivalent position" model is proposed and validated by simulation. The error of various powers of "stop-and-go" slant range is analyzed using Legendre orthogonal series expansion. The limitation of the stop-and-so assumption is proved by point target simulation.

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