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| Citation: | LI Qiang and FAN Huaitao. Channel phase mismatch calibration for multichannel in azimuth SAR imaging aided by digital elevation model[J]. Journal of Radars, 2019, 8(5): 616–623. doi: 10.12000/JR19009
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Channel Phase Mismatch Calibration for Multichannel in Azimuth SAR Imaging Aided by Digital Elevation Model
DOI: 10.12000/JR19009
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Abstract
In multichannel Synthetic Aperture Radar (SAR) data processing, the phase and amplitude characteristics of all channels should be well calibrated before multichannel data reconstruction; otherwise, the imaging result will be degraded and suffer from ghost targets. The yaw and pitch of the SAR platform, which change in azimuth and range, respectively, will cause phase mismatch among different channels. The currently developed attitude-aided phase mismatch calibration method does not consider the topographic relief. On the basis of the external Digital Elevation Model (DEM) and attitude information, a new phase mismatch calibration method is proposed in this study. The proposed method performs better than other methods in mountainous areas. A simulation experiment and the corresponding quantitative assessment are conducted. Then, the newly proposed method is applied to airborne multichannel SAR experimental data for further verification. -
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References
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- Figure 1. The attitude of airborne SAR system
- Figure 2. Movement of SAR antenna phase center
- Figure 3. 2-D cross-sectional view
- Figure 4. Imaging overlap caused by topograghic relief
- Figure 5. The flowchart of the proposed channel phase mismatch calibration method based on the aided DEM
- Figure 6. Five points set in the simulated scene
- Figure 7. Experimental results of the simulation
- Figure 8. The attitude information recorded by the IMU
- Figure 9. Imaging results of the airborne SAR experimental data