中文摘要：

针对步进频线性调频信号合成大带宽信号时各子带间的不一致性,提出了一种子带误差估计方法.该方法通过对相邻子带间的重叠谱相位差进行拟合,得到子带幅相误差和延时误差.同时还提出对各子带回波进行加窗处理以消除因子带重叠引起的成对回波.仿真数据和地基实测数据实验验证了文中方法的有效性.

英文摘要：

To reconstruct the spectrum of a wide band signal by stepped-frequency chirp signals,the mismatch between sub-band signals should be compensated,a novel method is proposed in this paper to estimate the sub-band errors depending on the overlap spectra between sub-band signals, with the amplitude-phase error and the time delay error between sub-band signals estimated by fitting the interferometric phase of the overlap spectra components.Besides,the window for eliminating the ghost images caused by the overlap spectra is proposed.Finally,the computer simulation and the ground-based real data confirm the validity of the method.