衛(wèi)星總體參數(shù)對(duì)SAR多普勒參數(shù)影響分析及仿真研究
Analysis and Simulation of Satellite System Parameter Effect on SAR Doppler Parameters
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摘要: 該文從星載合成孔徑雷達(dá)(SAR)空間幾何關(guān)系出發(fā)，建立了星載SAR多普勒參數(shù)的表達(dá)式。在考慮地球自轉(zhuǎn)和扁率的情況下，分析了軌道攝動(dòng)、衛(wèi)星姿態(tài)指向誤差和穩(wěn)定度對(duì)SAR多普勒參數(shù)的影響，并進(jìn)行了數(shù)字仿真。分析仿真結(jié)果表明軌道攝動(dòng)是造成星載SAR多普勒參數(shù)誤差的主要因素；姿態(tài)穩(wěn)定度的提高在減小多普勒參數(shù)誤差變化頻率的同時(shí)可以使誤差量降低。該文的研究結(jié)果對(duì)于分析總體參數(shù)對(duì)圖像質(zhì)量的影響和衛(wèi)星總體參數(shù)的確定和設(shè)計(jì)優(yōu)化具有參考價(jià)值。Abstract: On the basis of the space geometry relation of .space-borne Synthetic AportiuC Radar(SAR), its Doppler parameters formulation is built in this paper. Taking fclio earth rotation and oblateness into consideration, the orbit perturbation, attitude errors and its stability effects on SAR Doppler parameters are analyzed. The simulation result; .shows that orbit disturbance is the key factor to Doppler error, and the enhancement of attitude stabilization can lead to the decline of Doppler error as well as its variability. The conclusion is valuable for the determination and optimization of the system parameters.
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劉永坦.雷達(dá)成像技術(shù).北京:科學(xué)出版社,1999:97-110.[2]Aster B.[J].Stasio P D. Modelling earth rotation and spaceborne attitude errors for theoretic Doppler parameters evaluation[A]. Proccedings of IGARSS91 Symposium[C], Helsinki.1991,:-Olivier P. Analytical formulation of the Doppler parameters for spacebrone SAR processing[A].Proceedings of IGARSS91, Helsinki, 1991: 1051-1054.[3]Fernandez D E.[J].Meadows P J, Schattler B, Mancini P. ERS attitude errors and its impact on the processing of SAR data[A]. CEOSSAR Workshop99[C], ESA-CNES, Toulouse.1999,:-[4]田增山,劉麗川,黃順吉.矢量法確定星載SAR多普勒參數(shù).系統(tǒng)工程與電子技術(shù),2001(7):75-78.[5]Jin M Y. Prediction of SAR focus performance using ephemeris covariance[J].IEEE Trans. on Geoscience and Sensing.1993, 31(4):914-920 -
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