地球同步轨道星载SAR多普勒特性分析  

Doppler Properties Analysis of GEO Spaceborne SAR

作　　者：郑经波[1,2] 宋红军[1] 尚秀芹[1,2] 吴勇[1,2] 

机构地区：[1]中国科学院电子学研究所,北京100190 [2]中国科学院研究生院,北京100039

出　　处：《电子与信息学报》2011年第4期810-815,共6页Journal of Electronics & Information Technology

摘　　要：该文推导了适用于任意轨道高度的星载SAR多普勒中心频率和调频率的精确公式,为中高轨SAR多普勒特性的研究提供了有效的方法。基于上述公式,分析了地球同步轨道SAR多普勒中心频率与低轨SAR的联系;研究了星载SAR多普勒调频率随轨道高度的变化和地球自转对同步轨道SAR和低轨SAR调频率的影响;探讨了同步轨道SAR多普勒中心频率和调频率的特征。通过数值仿真验证了推导公式和多普勒特性分析的正确性。In this paper,the Doppler centroid frequency and the Doppler frequency rate formulas of spaceborne SAR with arbitrary orbit altitude are derived,which provides an effective method for Doppler properties study of MEO SAR and HEO SAR.Based on these formulas,the relation of Doppler centroid frequency between GEO SAR and LEO SAR is analyzed.The change of spaceborne SAR Doppler frequency rate with the orbit altitude,as well as the influence of earth rotation on the Doppler frequency rate of LEO SAR and that of GEO SAR are studied.The properties of Doppler centroid frequency and Doppler frequency rate of GEO SAR is discussed in detail.The validities of formulas and the analysis of Doppler properties are demonstrated by the numeric simulations.

关 键 词：SAR 地球同步轨道 多普勒中心频率 多普勒调频率 

分 类 号：TN959.74[电子电信—信号与信息处理]