Modeling and Quantitative Analysis of Tropospheric Impact on Inclined Geosynchronous SAR Imaging
Abstract
:1. Introduction
2. Modeling of Tropospheric Phase Errors
2.1. Modeling of Background Tropospheric Errors
2.1.1. The Radio Refractivity
2.1.2. Modeling of Propagation Errors
2.2. Modeling of Turbulence Random Errors
2.2.1. Power Spectrum Model of Tropospheric Turbulence
2.2.2. Turbulence Energy
2.2.3. Multiple Phase Screen Model
3. GEO SAR Signal Modeling and Tropospheric Effect Analysis
3.1. Background Troposphere Effects Analysis
3.1.1. Theoretical Analysis
3.1.2. Analysis and Discussion on Impacts of Different GEO SAR Configurations
3.2. Tropospheric Turbulence Effect Analysis
4. Simulations and Verifications
4.1. Background Troposphere
4.2. Tropospheric Turbulence
4.2.1. Simulations of Turbulent Energy
4.2.2. Simulation of Point Target
4.2.3. Discussion
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Appendix A. Influences of Different Wavelengths and Turbulent Energies
Band | PSLR (dB) (Average Value) | ISLR (dB) (Average Value) | |
---|---|---|---|
L | 0.1 | −13.41 | −9.19 |
1.0 | −12.45 | −5.91 | |
3.0 | −11.45 | −2.66 | |
C | 0.1 | −10.49 | −1.21 |
1.0 | −7.01 | 1.76 | |
3.0 | −5.49 | 4.48 | |
X | 0.1 | −9.17 | −0.21 |
1.0 | −5.55 | 5.71 | |
3.0 | −2.03 | 6.96 |
Appendix B. Influence of Different Integration Time
Band | Integration Time(s) | PSLR (dB) (Average Value) | ISLR (dB) (Average Value) |
---|---|---|---|
L | 100 | −13.41 | −9.11 |
150 | −13.58 | −8.68 | |
300 | −12.57 | −6.63 | |
C | 100 | −12.71 | −3.52 |
150 | −9.47 | −0.98 | |
300 | −7.06 | 2.27 | |
X | 100 | −8.39 | −0.34 |
150 | −6.96 | 2.21 | |
300 | −3.77 | 4.01 |
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ROC | ||||
---|---|---|---|---|
FY-3C Value | 2.21 | |||
IGF Value | 2.60 |
Parameters | Value | Parameters | Value |
---|---|---|---|
Height of GEO SAR (km) | 35,793.170 | Orbit Inclination (°) | 60 |
Pulse Repetition Frequency (Hz) | 150 | Look-down Angle (°) | 4.65 |
Velocity of GEO SAR (m/s) | 1.54 × 103 | Eccentricity | 0 |
Sampling Frequency (MHz) | 20 | Bandwidth (MHz) | 18 |
Tropospheric drift velocity (m/s) | 10 | Tropospheric penetrate point velocity (m/s) | 300 |
Offset(m) | PSLR (dB) | ISLR (dB) | Integration Time(s) | Remark | |||
---|---|---|---|---|---|---|---|
L-band | H | P | 3.7 | −13.24 | −10.43 | 180 | |
E | 1.7 | −13.26 | −10.43 | 80 | |||
L | P | - | - | - | 1843 | Defocus | |
E | 5.4 | −13.16 | −9.49 | 256 | |||
X band | H | P | 3.7 | −13.29 | −10.45 | 22 | |
E | 1.7 | −13.29 | −9.29 | 10 | |||
L | P | 38.6 | −9.35 | −7.18 | 230 | ||
E | 5.4 | −13.33 | −10.01 | 32 |
Band | Integration Time(s) | PSLR (dB) (Average Value) | ISLR (dB) (Average Value) |
---|---|---|---|
L | 100 | −13.41 | −9.24 |
150 | −13.37 | −9.74 | |
300 | −13.33 | −9.72 | |
C | 100 | −14.58 | −10.74 |
150 | −13.36 | −9.58 | |
300 | −13.26 | −9.70 | |
X | 100 | −12.39 | −8.76 |
150 | −12.11 | −8.09 | |
300 | −11.87 | −7.81 |
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Dong, X.; Hu, J.; Hu, C.; Long, T.; Li, Y.; Tian, Y. Modeling and Quantitative Analysis of Tropospheric Impact on Inclined Geosynchronous SAR Imaging. Remote Sens. 2019, 11, 803. https://doi.org/10.3390/rs11070803
Dong X, Hu J, Hu C, Long T, Li Y, Tian Y. Modeling and Quantitative Analysis of Tropospheric Impact on Inclined Geosynchronous SAR Imaging. Remote Sensing. 2019; 11(7):803. https://doi.org/10.3390/rs11070803
Chicago/Turabian StyleDong, Xichao, Jiaqi Hu, Cheng Hu, Teng Long, Yuanhao Li, and Ye Tian. 2019. "Modeling and Quantitative Analysis of Tropospheric Impact on Inclined Geosynchronous SAR Imaging" Remote Sensing 11, no. 7: 803. https://doi.org/10.3390/rs11070803
APA StyleDong, X., Hu, J., Hu, C., Long, T., Li, Y., & Tian, Y. (2019). Modeling and Quantitative Analysis of Tropospheric Impact on Inclined Geosynchronous SAR Imaging. Remote Sensing, 11(7), 803. https://doi.org/10.3390/rs11070803