Doppler Parameter Estimation for Spaceborne Synthetic-Aperture Radars

Problems in the determination of Doppler parameters for spaceborne synthetic-aperture radar (SAR) data processing are examined. The degradations in image quality due to errors in these parameters are summarized. We show that these parameters can be estimated using accurate spacecraft ancillary data. In cases where such data are not available, we propose two techniques to estimate these parameters using the coherent radar return. These techniques were tested with the Seasat SAR data and the test results demonstrate that the accuracies achieved exceed the system performance requirements. Possible applications of these techniques in other areas of SAR data utilization are briefly discussed.

[1]  Robert E. Jenkins,et al.  Synthetic Aperture Processing with Limited Storage and Presumming , 1973, IEEE Transactions on Aerospace and Electronic Systems.

[2]  J. P. Ruina,et al.  Some Early Developments in Synthetic Aperture Radar Systems , 1962, IRE Transactions on Military Electronics.

[3]  J. C. Curlander,et al.  Determination of spacecraft attitude using synthetic aperture radar data , 1980 .

[4]  D. N. Held,et al.  Amplitude calibration of synthetic aperture radars - The effects of nonlinearities , 1981 .

[5]  W. Brown,et al.  Range-Doppler Imaging with Motion through Resolution Cells , 1969, IEEE Transactions on Aerospace and Electronic Systems.

[6]  James L. Farrell,et al.  Synthetic Aperture Imaging with Maneuvers , 1972, IEEE Transactions on Aerospace and Electronic Systems.

[7]  H. Zebker,et al.  A digital Seasat SAR correlation-simulation program , 1981 .

[8]  Jean A. Develet.  The Influence of Random Phase Errors on the Angular Resolution of Synthetic Aperture Radar Systems , 1964, IEEE Transactions on Aerospace and Navigational Electronics.

[9]  Chialin Wu,et al.  Modeling and a Correlation Algorithm for Spaceborne SAR Signals , 1982, IEEE Transactions on Aerospace and Electronic Systems.

[10]  B. Huneycutt,et al.  An introduction to the interim digital SAR processor and the characteristics of the associated Seasat SAR imagery , 1981 .

[11]  F. Li,et al.  Ambiguities in Spacebornene Synthetic Aperture Radar Systems , 1983, IEEE Transactions on Aerospace and Electronic Systems.

[12]  C. Wu.  A digital system to produce imagery from SAR data. [Synthetic Aperture Radar , 1976 .

[13]  C. Elachi,et al.  Spaceborne Imaging Radar: Geologic and Oceanographic Applications , 1980, Science.

[14]  C. R. Christensen,et al.  Effects of speckle on resolution , 1976 .

[15]  Ian G. Cumming,et al.  Digital processing of Seasat SAR data , 1979, ICASSP.

[16]  E. Leith,et al.  A High-Resolution Radar Combat-Surveillance System , 1961, IRE Transactions on Military Electronics.

[17]  John Kirk.  A Discussion of Digital Processing in Synthetic Aperture Radar , 1975, IEEE Transactions on Aerospace and Electronic Systems.

[18]  Emmett N. Leith.  Optical Processing Techniques for Simultaneous Pulse Compression and Beam Sharpening , 1968, IEEE Transactions on Aerospace and Electronic Systems.

[19]  K. Tomiyasu,et al.  Tutorial review of synthetic-aperture radar (SAR) with applications to imaging of the ocean surface , 1978, Proceedings of the IEEE.

[20]  Leonard J. Porcello,et al.  Optical data processing and filtering systems , 1960, IRE Trans. Inf. Theory.

[21]  Leonard J. Porcello,et al.  Speckle reduction in synthetic-aperture radars , 1976 .

[22]  W. Brown.  Synthetic Aperture Radar , 1967, IEEE Transactions on Aerospace and Electronic Systems.

[23]  R. Jordan.  The Seasat-A synthetic aperture radar system , 1980, IEEE Journal of Oceanic Engineering.