Guo-Bin Jing, Guang-Cai Sun, Xiang-Gen Xia, Meng-Dao Xing, Zheng Bao
IEEE Geoscience and Remote Sensing Letters
For a multiple-input and multiple-output synthetic aperture radar, stepped frequency chirps can be used to generate high-resolution range profiles (HRRPs) by using spectrum synthesis. However, the presence of channel phase errors may degrade the performance of HRRP synthesis. This letter presents a channel error estimation method to address this problem. First, to obtain a focused subband image, a range phase adjustment by contrast enhancement algorithm is proposed to estimate inner-channel high-order phase errors. Second, a sidelobe balanced model is established to estimate constant phase error from the relationship between the balanced sidelobe and constant phase; the constant phase error can be directly obtained in an efficient manner. Experimental analysis using real data demonstrates the effectiveness of the proposed method.
GB Jing, GC Sun, XG Xia, MD Xing, Z Bao - IEEE Geoscience and Remote Sensing Letters, 2017