一种改进的多普勒中心频率估计方法

An improved method for the estimation of the Doppler centroid frequency

在合成孔径雷达成像及其应用中，需要对多普勒中心频率进行估计．在分析目标回波多普勒历程的时频模型基础上，提出了一种时频滤波的方法，该方法通过滤除部分强散射点的时频分布来消除功率谱的扭曲，进而提高多普勒中心频率估计的精度．实验证明了该方法的有效性．

In synthetic aperture radar (SAR) imaging and its application, it is necessary to estimate the Doppler centroid frequency accurately. The azimuth power spectra may be distorted due to the presence of the bright target that has been illuminated by a partial aperture, thus affecting the estimation of the Doppler centroid frequency. In this paper, we propose a time frequency filtering method based on the analysis of the model of the time frequency distribution of the Doppler phase history. This method can improve the azimuth power spectra and the precision of the Doppler centroid frequency estimation by filtering the time frequency distribution of the target illuminated by a partial aperture. The effectiveness of this method has been demonstrated by experimental results.