Effect of Temporal Variation of Atmospheric Refraction on Geosynchronous Circular SAR Focusing Performance

doi:10.13485/j.cnki.11-2089.2014.0124

Abstract

Abstract:

Combining the geosynchronous SAR (GEOSAR) with the circular SAR (CSAR), the geosynchronous circular SAR (GEOCSAR) has many advantages such as broad coverage, high resolution three dimensional (3D) imaging and continuous surveillance. However, due to its very long synthetic aperture time (about 24 hours for full aperture measurement), the effect of the atmospheric temporal variation may be significant, for the atmosphere usually changes its structures on timescales of minutes to hours. Since this paper considers the L-band GEOCSAR system, the tropospheric and ionospheric effects should both be included. The phase error due to the temporal variation of the tropospheric and ionospheric refraction is modeled. Then, the effect of the temporal variation of the troposphere and ionosphere on GEOCSAR imaging is derived and analyzed. Besides, the minimum of the random tropospheric and ionospheric temporal variation causing the L-band GEOCSAR imaging performance deterioration is deduced. The effects of atmospheric temporal variation are validated via simulations.

Key words: geosynchronous circular SAR (GEOCSAR), atmospheric refraction, temporal variation, troposphere, ionosphere

CLC Number:

P237

KOU Leilei XIANG Maosheng. Effect of Temporal Variation of Atmospheric Refraction on Geosynchronous Circular SAR Focusing Performance[J]. Acta Geodaetica et Cartographica Sinica, 2014, 43(9): 917-923.

References

[1] AKIA Ishimaru, CHAN Tsz-King, YASUO Kuga. An imaging technique using confocal circular synthetic aperture radar[J]. IEEE Transactions on Geoscience and Remote Sensing, 1998, 36(5): 1524-1530.
[2] KOU Leilei, WANG Xiaoqing, CHONG Jinsong, Xiang Maosheng, Zhu Minhui. Circular SAR processing using an improved omega-k type algorithm[J], Journal of Systems Engineering and Electronics, 2010, 21(4): 572-579.
[3] Global Earthquake Satellite System, a 20 year plan to enable earthquake prediction[EB/OL]. 2003, http://solidearth. jpl.nasa.gov/gess.html.
[4] DAVIDE B, STEPHEN E H, GIUSEPPE O. Geosynchronous synthetic aperture radar: concept design, properties and possible applications[J]. Acta Astronautica, 2006, 59(5): 149-156.
[5] MADSEN S N, WENDY E, LEO D. Didomenico and John LaBrecque. A geosynchronous synthetic aperture radar: for tectonic mapping, disaster management and measurements of vegetation and soil moisture[C]//IGARSS Proceedings. Hawaii: IEEE, 2001: 447-449.
[6] HU Cheng, LONG Teng, ZENG Tao. The accurate focusing and resolution analysis method in geosynchronous SAR[J]. IEEE Transactions on Geoscience and Remote Sensing, 2011, 49(10): 3548-3563.
[7] KIYO T. Synthetic aperture radar imaging from an inclined geosynchronous orbit[J]. IEEE Transactions on Geoscience and Remote Sensing, 1983, GE-21(3):324-329
[8] KOU Leilei, WANG Xiaoqing, XIANG Maosheng, ZHU Minhui. Interferometric estimation of three-dimensional surface deformation using geosynchronous circular SAR[J]. IEEE Transactions on Aerospace and Electronic Systems, 2012, 48 (2): 1619-1635.
[9] LIU Qi, HONG Wen, TAN Weixian, LIN Yun. An improved polar format algorithm with performance analysis for geosynchronous circular SAR 2D imaging[J]. Progress in Electromagnetics Research. 2011, 119:155-170.
[10] LISA C, CARLO C, DAVIDE L, et al. A ground-based parasitic SAR experiment[J]. IEEE Transactions on Geoscience and Remote Sensing, 2000, 38(5): 2132-2141.
[11] QUEGAN S, LAMONI J. Ionospheric and tropospheric effects on synthetic aperture radar performance[J]. International Journal of Remote Sensing, 1986, 7(4):525-539.
[12] SUN Jinping, BI Yuekai, WANG Yanping, HONG Wen. High resolution SAR performance limitation by the change of tropospheric refractivity[C]// IGARSS Proceedings. Vancouver: IEEE, 2011:1448-1451.
[13] LU Xiaoping. Series expression of correction for curved electronmagnetic signal path in troposphere[J]. Acta Geodaetica et Cartographica Sinica, 2008, 37(2): 142-146. (卢小平.电磁波信号在对流层中路径弯曲改正的级数展开[J].测绘学报，2008, 37(2):142-146.)
[14] DANKLMAYER A, BORING B J, SCHWERDT M. Assessment of atmospheric propagation effects in SAR images[J]. IEEE Transactions on Geoscience and Remote sensing, 2009, 47(10):3507-3518
[15] BELCHER D P, ROGERS N C.Theory and simulation of ionospheric effects on synthetic aperuture radar[J]. IET Radar, Sonar & Navigation, 2009, 3(5):541-551
[16] ZHANG Baocheng, OU Jikun, YUAN Yunbin, JIANG Zhenwei. Extracting precise atmospheric propaganda delays from multiple refrence station GPS networks[J]. Acta Geodaetica et Cartographica Sinica, 2012, 41(4):523-528. （张宝成，欧吉坤，袁运斌，蒋振伟.多参考站GPS网提取精密大气延迟[J].测绘学报，2012, 41(4):523-528.）
[17] AKIRA I, YASUGO K, LIU Jun. Ionospheric effects on SAR at 100MHz to 2GHz[C]//IGARSS Proceedings, Seattle: IEEE, 1998: 475-477.
[18] LIU Jun, KUGA Y, ISHIMARU A. Ionospheric effects on SAR imaging: a numerical study[J]. IEEE Transactions on Geoscience and Remote Sensing, 2003, 41(5): 939-947.
[19] ZILINSKAS M S. Tamosiunas and Tamosiunaite M. Yearly, seasonal and daily variations of radio refractivity[J], Acta Physica Polonica A, 2011, 119 (4): 533-536
[20] NORLAND R.Temporal variation of the refractive index in coastal waters[C]//Proceedings of SPIE, Wuhan: Society of Photo Optical, 2006:1-4.
[21] Jiao Peinan. Radar environment and propagation characteristics[M]. Beijing: Electronic Industry Press, 2007. (焦培南. 雷达环境和电波传播特性[M]. 北京：电子工业出版社，2007.)
[22] HUO Xingliang, YUAN Yinbin, OU Jikun, WEN Debao, LUO Xiaowen. Daily, half-yearly variation and winter anomaly phenomena of ionospheric TEC in China by means of GPS[J]. Progress in Natural Science, 2005, 15(5): 626-630. (霍星亮，袁运斌，欧吉坤，闻德保，罗孝文. 基于GPS资料研究中国区域电离层TEC的周日变化、半年度及冬季异常现象[J].自然科学进展，2005, 15(5):626-630.)
[23] KOU Leilei, WANG Xiaoqing, XIANG Maosheng. Effect of orbital errors on the geosynchronous circular SAR imaging and interferometric processing[J]. Journal of Zhejiang University Science, 2011, 12(5):404-416.
[24] ZHU M, WADGE G, Holley R J. High-resolution forecast models of water vapor over mountains: comparison with MERIS and meteosat data[J]. IEEE Geoscience and Remote Sensing letter, 2007, 4(3): 401-405.
[25] BRUNO D, HOBBS S E. Radar imaging from geosynchronous orbit: temporal decorrelation aspects[J]. IEEE Transactions on Geoscience and Remote Sensing, 2010, 48(7):2924-2929.