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| Citation: | Li Hangjian, Wang Robert, Deng Yunkai, Wang Wei, Zhang Heng. Analysis of Time and Beam Synchronization Errors for Distributed Spaceborne SAR System[J]. Journal of Radars, 2018, 7(2): 244-253. doi: 10.12000/JR17028
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Analysis of Time and Beam Synchronization Errors for Distributed Spaceborne SAR System
doi: 10.12000/JR17028
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Abstract
Synchronization is a key problem in distributed Synthetic Aperture Radar (SAR) systems. In this paper, we perform a complex mathematical deduction and then analyze the influences of time synchronization on the SAR imaging and interferometric process. We discuss the relationship between time and phase synchronization, considering that different oscillators in separated transmitters and receivers lead to both time and phase synchronization errors. With respect to beam synchronization, we present the effects of the accuracies of beam pointing and satellite attitude on the antenna gain, based on the attitude-steering strategy, which involves azimuth weighting of the Doppler spectra for independent zero-Doppler beam steering. We also analyze the influences of beam synchronization on Doppler decorrelation, Signal-to-Noise Ratio (SNR), and overlapping swath error. We conduct simulations to validate the analysis results. Our findings provide guidance for system design. -
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References
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- Figure 1. Impacts of yaw angle, pitch angle and roll angle
- Figure 2. The first attitude steering strategy
- Figure 3. The second attitude steering strategy
- Figure 4. Contributions to correlation coefficient versus along-track baseline
- Figure 5. No beam pointing error case
- Figure 6. Beam pointing error exists case
- Figure 7. Constant time error simulations
- Figure 8. Time error simulations after compensation in echo domain
- Figure 9. Gain loss versus beam pointing accuracy
- Figure 10. Coherent coefficient versus beam pointing accuracy
- Figure 11. Gain loss versus satellite attitude accuracy
- Figure 12. Coherent coefficient versus satellite attitude accuracy
- Figure 13. Overall influence on antenna gain versus beam pointing accuracy and attitude accuracy
- Figure 14. Overall influence on coherent coefficient versus beam pointing accuracy and attitude accuracy
- Figure 15. Overlapping swath error versus beam pointing accuracy
- Figure 16. Overlapping swath error versus roll angle
- Figure 17. Overlapping swath error versus roll angle and beam pointing error