Abstract
The interferometric imaging radar altimeter (InIRA) of Tiangong-2 is a new type of altimeter, which combines with traditional altimeter height tracking measurement technology, SAR synthetic aperture technology and SAR interference measurement technology. According to its imaging characteristics, a geometric correction algorithm for InIRA is proposed, and some positioning error sources included the virtual ellipsoid model, elevation errors and atmosphere transmission delay are corrected. Firstly, a geometric correction model is established based on slant Range-Doppler equations. Secondly, we correct the original virtual ellipsoid model of the geometric correction model to a new one for quite well describing its actual geometric relationship. Thirdly, we achieve elevation values from corresponding elevation data of InIRA as an input parameter of the geometric correction model. Fourthly, an atmosphere transmission delay is calculated by a simplified static model associated with elevation parameters. Finally, the geometric correction model is verified to be valid through actual images of InIRA. The result shows that the positioning accuracy improved by 3 pixels.
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References
Kong, W., Chong, J., Tan, H.: Performance analysis of ocean surface topography altimetry by ku-band near-nadir interferometric SAR. Remote Sens. 9(9), 933 (2017)
Hennig, T.A., Kretsch, J.L., Pessagno, C.J., et al.: The Shuttle Radar Topography Mission, vol. 45, no. 2, pp. 37–55. Springer, Berlin (2001)
Drinkwater, M.R., Francis, R., Ratier, G., et al.: The European Space Agency’s earth explorer mission CryoSat: measuring variability in the cryosphere. Ann. Glaciol. 39(1), 313–320 (2004)
Hong-Jian, Y., Kun, F.: Image Precise Processing of Synthetic Aperture Radar, vol. 13. Science Press, Beijing (2011)
Schubert, A., Small, D., et al.: COSMO-skymed, Terra SARX, and RADARSAT-2 geolocation accuracy after compensation for earth-system effects. In: 2012 IEEE International Geoscience and Remote Sensing Symposium (IGARSS2012), Germany, pp. 3301–3304(2012)
Williams, D., LeDantec, P., et al.: RADARSAT-2 image quality and calibration update. In: Proceedings of the 10th European Conference on Synthetic Aperture Radar, EUSAR 2014, Denmark, pp. 1–4 (2014)
Eineder, M., Minet, C., et al.: Imaging geodesy—Toward centimeter-level ranging accuracy with TerraSAR-X. IEEE Trans. Geosci. Remote Sens. 49(2), 667–671 (2011)
Curlander, J.C., McDonough, R.N.: Synthetic Aperture Radar: Systems and Signal Processing, pp. 374–377. Wiley, New York (1991)
Curlander, J.C.: Location of spaceborne SAR imagery. IEEE Trans. Geosci. Remote Sens. 20(3), 359–364 (1982)
Eineder, M., Minet, C., Steigenberger, P., et al.: Imaging geodesy—toward centimeter-level ranging accuracy with terraSAR-X. IEEE Trans. Geosci. Remote Sens. 49(2), 661–671 (2011)
Acknowledgements
Thanks to China Manned Space Engineering for providing space science and application data products of Tiangong-2.
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Liu, Z., Liu, Y., Wang, B. (2019). High-Precision Geometric Correction of Tiangong-2 Interferometric Imaging Radar Altimeter. In: Gu, Y., Gao, M., Zhao, G. (eds) Proceedings of the Tiangong-2 Remote Sensing Application Conference. Lecture Notes in Electrical Engineering, vol 541. Springer, Singapore. https://doi.org/10.1007/978-981-13-3501-3_10
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DOI: https://doi.org/10.1007/978-981-13-3501-3_10
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