TY - GEN
T1 - A Novel Spectrum Reconstruction and Imaging Processing Method for Squint Multichannel SAR
AU - Ma, Jixiang
AU - Wang, Pengbo
AU - Guo, Yanan
AU - He, Tao
AU - Zeng, Hongcheng
N1 - Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - Azimuth multichannel synthetic aperture radar(SAR) is a form of SAR with one transmitter and several receivers, which is able to obtain both high resolution and wide swath imaging. Azimuth spectrum reconstruction is core operation in the data processing of azimuth multichannel SAR. The spatial variation of Doppler center frequency is non-ignorable in multichannel SAR of squint view, meanwhile, in sliding spotlight SAR imaging mode, the Doppler spectrum of the signal increases greatly due to the rotation of the beam direction, thus, the traditional reconstruction algorithm fails to reconstruct the signal spectrum correctly. To solve above problems, an improved azimuth spectrum reconstruction and imaging processing algorithm for squint multichannel SAR in sliding spotlight mode is proposed. By analyzing the characteristics of multichannel signals in two-dimensional frequency domain, a new spectrum reconstruction matrix is established. Besides, by combining the Deramp operation with the reconstruction algorithm, the Doppler bandwidth caused by the rotation of the beam center is removed. Finally, imaging algorithm of single channel SAR is used to image the reconstructed signal. Simulation experiments verify the effectiveness of the method.
AB - Azimuth multichannel synthetic aperture radar(SAR) is a form of SAR with one transmitter and several receivers, which is able to obtain both high resolution and wide swath imaging. Azimuth spectrum reconstruction is core operation in the data processing of azimuth multichannel SAR. The spatial variation of Doppler center frequency is non-ignorable in multichannel SAR of squint view, meanwhile, in sliding spotlight SAR imaging mode, the Doppler spectrum of the signal increases greatly due to the rotation of the beam direction, thus, the traditional reconstruction algorithm fails to reconstruct the signal spectrum correctly. To solve above problems, an improved azimuth spectrum reconstruction and imaging processing algorithm for squint multichannel SAR in sliding spotlight mode is proposed. By analyzing the characteristics of multichannel signals in two-dimensional frequency domain, a new spectrum reconstruction matrix is established. Besides, by combining the Deramp operation with the reconstruction algorithm, the Doppler bandwidth caused by the rotation of the beam center is removed. Finally, imaging algorithm of single channel SAR is used to image the reconstructed signal. Simulation experiments verify the effectiveness of the method.
KW - Deramp
KW - dynamic spectrum reconstruction
KW - squint multichannel SAR
UR - https://www.scopus.com/pages/publications/85140394717
U2 - 10.1109/IGARSS46834.2022.9883538
DO - 10.1109/IGARSS46834.2022.9883538
M3 - 会议稿件
AN - SCOPUS:85140394717
T3 - International Geoscience and Remote Sensing Symposium (IGARSS)
SP - 2071
EP - 2074
BT - IGARSS 2022 - 2022 IEEE International Geoscience and Remote Sensing Symposium
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2022 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2022
Y2 - 17 July 2022 through 22 July 2022
ER -