摘要
本文分析了斜视调频连续波SAR中载机连续运动的影响——产生多普勒频移,以及其对图像聚焦的影响,建立了斜视调频连续波SAR信号模型,在分析了现有频率变标算法在斜视角较大情况下失效根源的基础上,提出了一种斜视数据等效正侧视处理方法,通过对斜视数据的预处理,将斜视数据按正侧视的方法来处理;针对预处理带来的方位聚焦深度的制约,采用方位非线性调频变标处理克服方位聚焦深度的限制.最后通过点目标仿真数据处理验证所提算法的有效性.
Frequency Modulated Continuous Wave （FMCW） Synthetic Aperture Radar （SAR） is a new conceptual SAR system. This paper analyses the effect of the platform＇s continuous motion in squint FMCW SAR, i. e. generating Doppler frequency shift, and its effect on image focusing. Considering the deficiency of the present FS algorithm in the case of high squint angle,this paper proposes an equivalent side-looking method for squint FMCW SAR. After pre-processing for the squint SAR data, we can use the imaging algorithm for side-looking mode to process the squint SAR data;for the azimuth focusing depth induced by the pre-processing, this paper utilizes the azimuth non-linear chirp scaling algorithm to overcome this phenomenon. At last, imaging results of the simulated data have proved the validity of the proposed algorithrn.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2009年第6期1159-1164,共6页
Acta Electronica Sinica
基金
自然科学青年基金(No.60502044)
教育部重点项目(No.20051009)
