聚束式FMCW-SAR的波数域成像算法研究  

Spotlight FMCW-SAR Imaging Using Wavenumber Domain Algorithm

作　　者：王霖郁[1] 杜传红 

机构地区：[1]哈尔滨工程大学信息与通信工程学院,黑龙江哈尔滨150001

出　　处：《计算机仿真》2013年第10期10-13,297,共5页Computer Simulation

基　　金：国家自然科学基金(61203004);中央高校基本科研业务费(HEUCFT1203)

摘　　要：研究雷达波成像优化问题,聚束工作模式(Spotlight)是调频连续波(FMCW)SAR实现高分辨力成像的一种重要手段。为精确成像,波数域算法经常被用在脉冲SAR的聚束工作模式下。FMCW-SAR由于受扫频周期内平台连续运动的影响,方位向不能很好聚焦。为解决上述问题,通过研究聚束模式下平台连续运动对FMCW-SAR的影响,首次推导出在聚束模式下FMCW-SAR的波数域成像方法,通过仿真结果可以看出,改进算法可以使方位向回波信号能量完全集中,很好解决了连续波SAR所特有的平台在扫频周期内运动引起的距离走动问题,为优化成像提供了依据。In this paper, radar imaging optimization issues were investigated. Spotlight mode is an important means to achieve high - resolution imaging for Frequency Modulated Continuous Wave SAR. As one of the most accu- rate imaging algorithms, Wavenumber Domain Algorithm is often used in spotlight mode for pulse SAR. Due to the effects of the continuous motion of the radar platform, FMCW - SAR can not be focused on azimuth. In order to solve this problem, this paper analysed the impact of continuous motion of the platform for the spotlight mode FMCW - SAR, and a new processing algorithm for spotlight FMCW - SAR was presented using Wavenumber Domain algorithm for the first time. Simulation results show that the novel method can figure out the range migration problem induced by the motion within the sweep of FMCW - SAR and make the azimuth direction＇ energy concentrate very well.

关 键 词：合成孔径雷达 调频连续波 聚束模式 波数域算法 

分 类 号：TN958[电子电信—信号与信息处理]