Distribution-based CFAR detectors in SAR images

As traditional two-parameter constant false alarm rate （CFAR） target detec-tion algorithms in SAR images ignore target distribution, their performances are not the best or near best. As the resolution of SAR images increases, small targets present more pixels in SAR images. So the target distribution is of much significance. Distribution-based CFAR detection algorithm is presented. We unite the pixels around the test cell, and estimate the distribution of test cell by them. Generalized Likelihood Ratio Test （GLRT） is used to deduce the detectors. The performance of the distribution-based CFAR （DBCFAR） detectors is analyzed theoretically. False alarms of DBCFAR detection are fewer than those of CFAR at the same detection rate. Finally experiments are done and the results show the performance of DBCFAR is out of conventional CFAR. False alarms of DBCFAR detection are concentrated while those of CFAR detection are dispersive.

浅析电子战在防空系统中的效能

电子战是现代战争中不可或缺的作战力量,是作战体系的重要组成部分。针对最近俄罗斯防空系统在电子战配合下效力提升2倍的消息开展分析研究,首先分析以S-400为代表的典型防空系统组成、作战使用和效能指标体系,然后针对电子战的加入修正效能模型,最后假设一组效能指标参数对模型进行计算。分析结果表明,电子战对增强防空系统效能具有较大贡献,电子战使S-400作战效能提升2倍是可能的,具体提升程度与电子战的使用、建立的具体效能模型和效能指标的度量等因素有关。

数据后处理雷达回波展宽分析及逼真模拟方法

数据后处理雷达基于真假目标雷达回波距离和方位展宽特征差异实现抗干扰,传统的单点目标回波生成方法难以满足数据后处理雷达对抗技术的验证。定量分析真实目标雷达回波在距离和方位的展宽特征,并站在雷达对抗技术仿真验证角度提出一种基于距离扩展调制和方位扩展控制的逼真回波信号产生方法。经仿真验证表明,该方法产生的回波信号经雷达处理后具有逼近真实目标的展宽特征,对新体制雷达对抗技术仿真验证系统的设计具有参考意义。