橢圓軌道下雷達多普勒特性估計
Radar Doppler Properties Evaluation in Elliptic Orbits
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摘要: 在星載合成孔徑雷達中，多普勒特性是決定雷達方位向性能的主要因素，對它的正確估計將影響到雷達的性能和最后成像的精度。該文以橢圓軌道為基礎，對不同軌道角度下的多普勒中心頻率和多普勒調(diào)頻斜率進行了估計，考慮了衛(wèi)星不同姿態(tài)誤差對它的影響，并也圓軌道下的情況進行了對比。最后討論了橢圓軌道下零多普勒點的偏角情況。
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關(guān)鍵詞:
- 合成孔徑雷達（SAR）; 多普勒頻率; 姿態(tài)誤差; 偏航控制
Abstract: For spaceborne Synthetic Aperture Radar (SAR), Dopplcr property is one of the most important factors for azimuth performance. In this paper, the elliptic orbit is applied. The Doppler centroid frequency and Doppler frequency rate are evaluated in different orbit angle with the affection of attitude error considered. And the comparison with circular orbit is given. Finally, yaw steering is discussed. -
Elachi C. Spaceborne Radar Remote Sensing, Applications and Techniques. New York: IEEE Press, 1987: 72-109.[2]Tomiyasu K. Tutorial review of Synthetic-Aperture Radar (SAR) with applications to imaging of the ocean surface[J].Proc. IEEE.1978, 66(5):563-583[3]Bickel D L.[J].Brock B C, Allen C T. Spaceborne SAR Study. LDRD92 Final Report.1992,:-[4]Curlander J C, McDonough R N. Synthetic Aperture Radar Systems and Signal Processing. New York: Wiley Interscience, 1991: 427-434.[5]Li F K, Held D N, Curlander J C, Wu C. Doppler parameter estimation for spaceborne syntheticaperture radars. IEEE Trans. on Geoscience and Remote Sensing, 1985, GRS-23(1): 47-55.[6]Bruno Aster, Pasquale Di Stasio. Modelling earth rotation and spaceborne attitude errors for theoretic Doppler parameters evaluation. IGARSS 91, Helsinki, 1991: 2409-2411.[7]Raney R K. Doppler properties of radars in circular orbits[J].Int. J. Remote Sensing.1986, 7(9):1153-1162[8]張守信.外彈道測量與衛(wèi)星軌道測量基礎.北京:國防工業(yè)出版社,1992:6-208. -
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