摘要
通过对移变双站SAR的飞行几何模型的分析,用极坐标格式算法(PFA)实现了移变模式下的双站SAR成像。首先推导移变模式下的条带双站SAR回波模型,再利用条带式SAR与聚束式SAR的内在联系,将条带式SAR的回波数据转换为聚束式SAR二维去斜后的同形回波数据。通过对回波数据的分析,提出移变模式下的PFA算法,并用坐标系旋转的方法提高数据利用率。对点目标的仿真实验证实了该方法的可行性,并且得到优于RD的聚焦效果。
Variant airborne bistatic SAR imaging is realized by Polar Format Algorithm (PFA) through analyzing flying geometry model of variant airborne bistatic SAR. The echo signal model is derived under variant airborne bistatic SAR with stripmap model first; then change the echo signal from stripmap model to spotlight-like model, which has the same structure as the 2 - dimentional dechirp signal of spotlight model, with the relationship of the two model. After above steps, PFA under variant airborne bistatic SAR can be generated through the analysis of echo signal formula. It has been proved to be correct in theoretic analysis and viable in imaging algorithm by point target experiment, and the result shows a better performance than RD algorithm.
出处
《电子信息对抗技术》
2009年第3期29-33,共5页
Electronic Information Warfare Technology