对SAR-GMTI的运动调制-步进移频复合干扰  

A Motion Modulated and Step Frequency Shifting Compound Interference to SAR-GMTI

作　　者：周阳[1] 毕大平[1] 房明星[1] 沈爱国[1] 

机构地区：[1]电子工程学院503室,安徽合肥230037

出　　处：《信号处理》2016年第12期1468-1477,共10页Journal of Signal Processing

基　　金：国家自然科学基金(61171170);总装预研基金资助课题(5133030103)

摘　　要：提出一种对SAR-GMTI的干扰新方法:运动调制-步进移频复合干扰。该方法将干扰信号载频在脉间步进递增或递减变化,同时进行运动附加相位调制,可在SAR成像中形成区域遮蔽干扰效果,然后以三通道干涉对消技术为例分析了其对多通道GMTI的对抗性能。该方法的优点有两个:一是遮蔽区域大小和位置均可以通过改变干扰参数进行控制;二是干扰信号与SAR的距离和方位向滤波器是部分匹配的,因此所需的干扰功率比较小。仿真实验验证了此方法对SAR成像和SAR-GMTI成像均具有不错的干扰效果。A new method of jamming to SAR-GMTI is proposed, which is called motion modulated and step frequency shifting compound interference. The carrier frequency of the jamming signal varies in step between the pulses, increasing or decreasing. And at the same time, an additional motion phase modulation is appended. In this way, a regional shielding interference area in the SAR imaging is formed. Then the performance of the jamming was analyzed. A GMTI instance with three channels was introduced and the result was explained in the paper. There are two advantages of this method. First, the size and position of the sheltered area can be controlled by changing the interference parameters. And second, the interference signal is matched to the filters of radar in a certain extent beth in range and azimuth. So it requires relatively smaller interference power. The simulation results verified that this method has a good effect on the SAR imaging and SAR-GMTI imaging.

关 键 词：合成孔径雷达地面动目标显示 步进移频干扰 运动调制干扰 对抗性能 

分 类 号：TN911[电子电信—通信与信息系统]