此算法的递推公式减少运算量，从而提高电功率测量的实时性。
This recursive algorithm formula reduces the amount of computation, thereby increase electric power real-time measurement.
理论分析表明：近场三维距离偏移算法与后向投影算法相比，能在较大程度上减少运算量。
Theoretical analysis shows that near field 3-d range migration imaging technique can reduce computational complexity in much degree by contrast with back propagation algorithm.
结论在压缩域进行遥感图像处理，不但可简化运算，减少运算量，而且可使处理速度大大提高。
Conclusion It indicates that not only simpler operation and smaller calculation are obtained but also the processing speed is improved greatly.
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