摘要
P波段合成孔径雷达具有一定的穿透性,在军事和民用具有重要前景。利用地基P波段雷达对电离层中空间目标进行监测时,电离层会影响雷达回波信号相位。通过建模和仿真,对电离层的时空变化对雷达回波相位的影响进行了定性和定量分析,基于平移相关法提出了一种电离层参数估计方法,并利用估计的电离层参数对雷达回波相位进行校正,消除了电离层对雷达回波的污染,还原了目标图像。仿真实验及实测结果验证了该算法的有效性。
P-band synthetic aperture radar（SAR）has superiority for its strong abi1ity to survei1 the hidden targets in both mi1itary and civi1 app1ications.Observating space objects existing in or above the ionosphere with P-band ground-based radar,the phase of the echo will be changed randomly due to ionosphere.This paper analyzes the background ionospheric effects on ISAR with modeling and simulation,and gives the qualitative and quantitative analysis based on the spatio-temporal variability of ionosphere.An estimating method is proposed for acquiring the characteristic of ionospheric using the shift and correlation （SAC）method.With the obtained ionosphere parameters,the degradation of image quality caused by the ionosphere is corrected.The simulation and the real data results confirm the validity of the approach.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2015年第7期1519-1525,共7页
Systems Engineering and Electronics
基金
高等学校博士学科点专项科研基金(20120203130001)
中央高校基本科研业务费专项资金(JZ2015HGQC0191)资助课题
关键词
电离层
P波段
逆合成孔径雷达
平移相关法
ionosphere
P-band
inverse synthetic aperture radar （ISAR）
shift and correlation （SAC）
