星載合成孔徑雷達(dá)系統(tǒng)偏航控制的精確計(jì)算
Precise Computation of Yaw-Steering in Spaceborne Synthetic Aperture Radar System
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摘要: 該文詳細(xì)推導(dǎo)了星載合成孔徑雷達(dá)系統(tǒng)中偏航控制角的精確計(jì)算公式；由于推導(dǎo)過(guò)程中衛(wèi)星軌道采用了標(biāo)準(zhǔn)的橢圓軌道模型和地球的橢球體模型，從而解決了傳統(tǒng)的近似計(jì)算方法所帶來(lái)的殘余偏差較大的問(wèn)題。所得結(jié)果普遍適用于不同軌道和雷達(dá)參數(shù)的星載合成孔徑雷達(dá)系統(tǒng)。文中同時(shí)給出了一種快速的近似計(jì)算方法，最后給出了采用TerraSAR-X系統(tǒng)參數(shù)時(shí)的仿真計(jì)算結(jié)果。利用該文提出的計(jì)算方法，采用偏航控制的多普勒中心校正誤差可以達(dá)到0.01Hz量級(jí)，從而實(shí)現(xiàn)了偏航控制的精確計(jì)算。
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關(guān)鍵詞:
- 星載合成孔徑雷達(dá);多普勒中心;偏航控制
Abstract: In this paper, an advanced method in precisely computing of yaw-angle in space-borne Synthetic Aperture Radar (SAR) system is proposed in detail. Standard elliptical orbit model as well as earth ellipsoid model is assumed in the course of development, thus the bias caused by conventional approximation is eliminated. The result of this paper is popular for different kind of space-borne SAR system. A simple algorithm suitable to fast computation for space-born SAR system is also exploited in this paper. The result of simulation in condition of TerraSAR-X system is given in the end. By using the computing method of this paper, emendation error after yaw-steering can be reduced to centesimal Hz level. Thus, precise computation of yaw-steering is successfully achieved. -
Hartmut Runge. Benefits of antenna yaw steering for sar. IGARSS91 Proc. Volume I, June 3-6, 1991: 257-261.[2]王睿，楊汝良. 橢圓軌道下雷達(dá)多普勒特性估計(jì)[J].電子與信息學(xué)報(bào).2004,26(1):107-111瀏覽[3]高祥武. 星載聚束模式合成孔徑雷達(dá)系統(tǒng)研究. [博士論文]，中國(guó)科學(xué)院研究生院，2004年6月.[4]Ranney R K. Doppler properties of radars in circular orbits[J].Int. J. Remote Sensing.1986,7(9):1153-1162[5]孟云鶴，尹秋巖，戴金海. SAR衛(wèi)星多普勒頻移偏航導(dǎo)引補(bǔ)償效果分析. 中國(guó)空間科學(xué)技術(shù)，2004，2(1): 45-49.[6]Gordon W, Ian Cumming. Signal properties of spaceborne squint-mode sar[J].IEEE Trans. on Geoscience and Remote Sensing.1997,35(3):611-617[7]Fitch J Patrick, Burrus C S. Synthetic aperture radar. Springer-Verlag, 1988: 53-57. -
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