Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography (한국측량학회지)

Korean Society of Surveying, Geodesy, Photogrammetry and Cartography (한국측량학회)
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Geolocation Error Analysis of KOMPSAT-5 SAR Imagery Using Monte-Carlo Simulation Method

  • Received : 2019.03.17
  • Accepted : 2019.04.29
  • Published : 2019.04.30
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Abstract

Geolocation accuracy is one of the important factors in utilizing all weather available SAR satellite imagery. In this study, an error budget analysis was performed on key variables affecting on geolocation accuracy by generating KOMPSAT-5 simulation data. To perform the analysis, a Range-Doppler model was applied as a geometric model of the SAR imagery. The results show that the geolocation errors in satellite position and velocity are linearly related to the biases in the azimuth and range direction. With 0.03cm/s satellite velocity biases, the simulated errors were up to 0.054 pixels and 0.0047 pixels in the azimuth and range direction, and it implies that the geolocation accuracy is sensitive in the azimuth direction. Moreover, while the clock drift causes a geolocation error in the azimuth direction, a signal delay causes in the range direction. Monte-Carlo simulation analysis was performed to analyze the influence of multiple geometric error sources, and the simulated error was up to 3.02 pixels in the azimuth direction.

Keywords

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Fig. 1. Error budget analysis flow based on Monte-Carlo simulation

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Fig. 2. KOMPSAT-5 SAR images and distribution of GCPs

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Fig. 3. Geolocation accuracy of KOMPSA T-5 images in the study area

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Fig. 4. Distribution of the geolocation error

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Fig. 5. Simulated error by satellite position bias

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Fig. 6. Simulated error by satellite velocity bias

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Fig. 7. Simulated error by clock drift bias

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Fig. 8. Simulated error by signal delay bias

Table 1. Main geometric parameters in SAR imaging system

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Table 2. Information of KOMPSAT-5 images used for the study

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Table 4. Monte-Carlo simulation results (unit: pixel)

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Table 3. Simulated biases for error budget analysis

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