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| Citation: | GAO Ming, QIU Xiaolan, MENG Dadi, et al. Geolocation error transfer model and trajectory calibration method of airborne SAR considering the motion compensation residual error[J]. Journal of Radars, 2021, 10(4): 646–655. doi: 10.12000/JR21018
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Geolocation Error Transfer Model and Trajectory Calibration Method for Airborne SAR Considering Motion Compensation Residual Error
doi: 10.12000/JR21018
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Abstract
Airborne Synthetic Aperture Radar (SAR) location error is affected by the position/speed measurement error of the aircraft, system time error, etc., and also related to the residual error of motion compensation. However, the existing airborne SAR location model rarely considers the effect of residual motion error. Considering that motion and trajectory measurement errors are common in practice, this paper derives a location error transfer model of an airborne SAR image based on the motion compensation and frequency-domain imaging algorithms. The proposed model clarifies the influence of trajectory measurement error on location deviation when residual motion error exists and provides a method of error calibration measurement. The simulation experiments validate the correctness of the proposed location error transfer model. The present method obtains a more accurate error calibration measurement result than the location error model that does not consider the residual motion error, proving the superiority of the proposed model. -
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References
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- Figure 1. Airborne SAR geometry
- Figure 2. SAR geometric relationship in the cross-track plane
- Figure 3. Diagram of imaging results
- Figure 4. Schematic diagram of trajectory setting
- Figure 5. Schematic diagram of simulation scene
- Figure 6. Schematic diagram of calibration trajectory
- Figure 7. Contrastive diagram of trajectory deviation in x direction
- Figure 8. Contrastive diagram of trajectory deviation in z direction
- Figure 9. Imaging results using the calibration trajectory
- Figure 10. Schematic diagram of simulation scene
- Figure 11. Calibration result of the whole trajectory
- Figure 12. Contrastive diagram of calibration results
- Figure 13. Contrastive diagram of deviation of the whole trajectory in x direction
- Figure 14. Contrastive diagram of deviation of the whole trajectory in z direction
- Figure 15. Schematic diagram of calibration trajectory
- Figure 16. Contrastive diagram of trajectory deviation in x direction
- Figure 17. Contrastive diagram of trajectory deviation in z direction
- Figure 18. Imaging results using the calibration trajectory