三次相位误差对SAR方位分辨率的限制

The Limitations of Cubic Phase Error on SAR Azimuth Resolution

本文深入研究了合成孔径雷达（SAR）系统中三次相位误差对方位分辨率的限制问题．首先讨论了基于泰勒展开的传统分析方法，然后针对传统分析方法的不足，即泰勒展开式中各项不正交，提出了基于Leg-endre正交展开的新方法，推导了方位分辨率因三次相位误差的影响而受系统参数制约的数学表达式，并给出了具有典型参数的机载和星载SAR的仿真结果．本文的结论可用于SAR系统的设计优化．

This paper studies the limitation of cubic phase error on SAR azimuth resolution deeply. The traditional analysis method about the cubic phase error based on Taylor expansion, is introduced first. In the light of Taylor expansion non-orthogonality of traditional method, a new method based on the Legendre orthogonal polynomial is provided. The corresponding formula expressing the limitationof of SAR system parameters on the azimuth resolution owing to the cubic phase errorl are deduced, and the simulation of airborne and spacebome SAR with some typical system parameters are given also. The conclusion of this paper can be used in SAR system parameters selection optimization.