TY - GEN
T1 - Impacts of azimuth antenna steering angle quantization on tops and sliding spotlight SAR image
AU - Zeng, Hong Cheng
AU - Chen, Jie
AU - Yang, Wei
AU - Zhang, Hao Jie
N1 - Publisher Copyright:
© 2018 IEEE
PY - 2018/10/31
Y1 - 2018/10/31
N2 - Quantization step size is a very important system parameter in TOPS and sliding spotlight acquisition modes, as the azimuth antenna beam is electronically steering during the illumination. By replacing continuous steering, staircase-like steering in azimuth antenna beam is often used in orbited SAR, causing a quantized error on azimuth antenna pattern (AAP) and an amplitude modulation on illuminated target echo. Consequently, infinitely many spurious targets are introduced in azimuth direction. In this paper, investigations of quantized AAP on TOPS and sliding spotlight SAR image are carried out, by unified modelling on quantized AAP and spurious targets signal. Then, the position of maximum peak of spurious targets and its peak level are derived, which is only decided by azimuth antenna length, signal wavelength and quantization step size, and have nothing to do with the acquisition mode. Finally, simulation results verify the correctness of the proposed mathematical model of spurious target.
AB - Quantization step size is a very important system parameter in TOPS and sliding spotlight acquisition modes, as the azimuth antenna beam is electronically steering during the illumination. By replacing continuous steering, staircase-like steering in azimuth antenna beam is often used in orbited SAR, causing a quantized error on azimuth antenna pattern (AAP) and an amplitude modulation on illuminated target echo. Consequently, infinitely many spurious targets are introduced in azimuth direction. In this paper, investigations of quantized AAP on TOPS and sliding spotlight SAR image are carried out, by unified modelling on quantized AAP and spurious targets signal. Then, the position of maximum peak of spurious targets and its peak level are derived, which is only decided by azimuth antenna length, signal wavelength and quantization step size, and have nothing to do with the acquisition mode. Finally, simulation results verify the correctness of the proposed mathematical model of spurious target.
KW - Azimuth Antenna Pattern
KW - Quantization Step Size
KW - Sliding Spotlight
KW - Spurious Target
KW - TOPS
UR - https://www.scopus.com/pages/publications/85063138690
U2 - 10.1109/IGARSS.2018.8517802
DO - 10.1109/IGARSS.2018.8517802
M3 - 会议稿件
AN - SCOPUS:85063138690
T3 - International Geoscience and Remote Sensing Symposium (IGARSS)
SP - 7813
EP - 7816
BT - 2018 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2018 - Proceedings
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 38th Annual IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2018
Y2 - 22 July 2018 through 27 July 2018
ER -