对调频步进ISAR雷达两种干扰效果的比较分析

The Comparison and Analysis of Two Jamming Effect of Stepped Frequency Modulated ISAR Radar

调频步进雷达可以在较低的瞬时带宽下合成高分辨二维像,具有较高的处理增益和抗干扰能力。针对常规窄带噪声干扰调频步进雷达效果差的问题,从调频步进雷达成像机理出发,对一维距离像的合成过程进行分析。利用噪声卷积破坏其中的一维距离像合成,降低二维成像质量以提高干扰效果。结合常规窄带和卷积两种干扰,采集中频数据进行对比分析。结果表明,相比于常规窄带噪声干扰,卷积噪声干扰对干扰功率要求更低,在相同干信比条件下,干扰效果更好。

FM-step radar signal can synthesize high resolution 2D image with low instantaneous bandwidth which owns high processing gain and strong anti-noise jamming ability.For poor effect on the FM-step radar with the conventional narrowband noise interference,it dissects the one-dimensional distance image based on the imaging mechanism of FM-step radar.A new method is proposed to improve the interface effect by destroying the one-dimensional range image by noise convolution.Combined with the theventional noise interference and convolution interference,the contrastive analysis of two gamming is carried out based on the collected real data.Compared with conventional narrow-band interference,the results show that convolutional noise interference has lower requirement for interference power and better interference effect under the same jamming signal ratio.