摘要
在将调频连续波(FMCW)信号应用于双基地ISAR的成像过程中,针对应用FMCW信号在回波信号中产生距离快时间和方位慢时间耦合项的问题,提出了应用离散多项式相位变换的方法进行组合参量估计,通过估计出的组合参量构造补偿函数对回波信号进行相位补偿,消除了一次耦合项产生的固定频偏和二次耦合项引起的主瓣展宽,对补偿后的回波信号应用距离多普勒算法可获得清晰的目标二维像,通过仿真表明:所述的补偿算法能有效改善应用FMCW信号而产生的目标像散焦现象,获得聚焦良好的点目标像。
A method is proposed for solving the problem when using Frequency Modulation Continuous Wave（FMCW） in Bi-static ISAR system.Considering coupling terms induced by using FMCW signal,the Discrete Polynomial Phase Transform（DPT） is used to estimate the combined component,then the phases of echo signal are compensated by using compensation functions to eliminate the fixed frequency offset caused by first coupling term and main-lobe expansion induced by second coupling term.The Range Doppler algorithm is used to attain clear target＇s image.At last,the validity of the proposed compensation algorithm is validated by simulation and focused image is obtained.
出处
《宇航学报》
EI
CAS
CSCD
北大核心
2012年第2期222-227,共6页
Journal of Astronautics
基金
国家自然科学基金(60971100)
