在分析SAR Range-Doppler算法的基础上，给出了其sinc插值的多项式拟合简化算法，该算法可以在保持图像质量的情况下，较大地减少计算量。提出采用Taylor展开和最小二乘法来确定多项式系数的两种拟合方法，并给出了误差分析和比较。最后采用RADARSAT的实测数据对插值算法进行了验证，仿真结果证明，文中给出的插值方法，对于实时性要求较高的系统有重要意义，可以应用于SAR实时信号处理中。

This paper recommends a new simplified sinc interpolation algorithm based on Range-Dopplor algorithm of SAR. By using the new interpolation algorithm, computation amount can be reduced, and the quality of SAR image can still be guaranteed. Two methods are suggested to realize the polynomial fit. One is Taylor expansion and the other is based on least square criterion to get the parameter of fitting polynomial. Error analysis is given to demonstrate the performance of these two methods. Finally, the algorithms are verified by using raw data of RADARSAT. The result shows that the proposed algorithms can reduce the computational complexity efficiently and the algorithms can be used in real time SAR signal processing.

TN959.73 TN958