An improved method of Doppler centroid estimation in SAR

Successful processing of Synthetic Aperture Radar (SAR) requires that the Doppler centroid frequency (f_dc) be accurately estimated. The energy balancing method is one of the methods to estimate the f_dc, though it has some shortcomings. The paper brings forward an improved method which estimates the f_dc more effectively. This paper finally shows the new method´s results by processing raw data and analyzes its performance. A conclusion is drawn that the results of the improved method are precise; furthermore, the improved method can compute the f_dc without iterative computations, so it is more suitable for real time processing on DSP and has higher efficiency.