局部最大延迟检测抗转发欺骗干扰算法

接收机在进行窄带干扰抑制后,其输出信号的相关峰会发生分裂。使用传统的基于信号到达时间的抗转发欺骗干扰算法,会使得捕获锁定的相关值为真实信号的旁瓣。针对该问题提出一种基于局部相关值最大的时延检测方法,在真实信号相关峰分裂所产生的旁瓣与欺骗信号不重合前提下,通过对主瓣三个码片范围内最大值的搜索,保证捕获不会锁定在旁瓣,再选择局部最大值中的最早码相位点从而避免锁定到转发欺骗干扰。与传统的基于信号到达时间的抗转发欺骗干扰算法相比,在无窄带干扰情况下,所提算法性能相当;在存在窄带干扰情况下,其性能明显优于传统算法。通过数值仿真验证了方法的有效性。     

多车通信系统中的同频电子干扰消除优化方法

在多接口多信道车联网多车通信系统中,由于车辆的自组织特性和路网网格的不均衡性,产生同频电子干扰,对电子干扰的滤波消除能提高多车通信的信道均衡性,降低误码率。传统方法采用自适应陷波方法实现同频电子干扰消除,无法在突变的载波频率下消除同频电子干扰,导致性能差的问题。提出一种基于自适应线谱增强的多车通信系统中的同频电子干扰消除优化方法。首先构建多车通信系统,引入一种信噪干扰比的观点,对同频电子干扰进行信号模型构建,根据信号比容易分离的特点,使得模型可分离性变强,结合变步长自适应线谱增强方法,实现信号的分离过滤。仿真实验结果表明,进行同频电子干扰消除抑制处理后的功率谱收敛到信号的真实频率附近,多车通信信号能从背景色噪声中有效检测出来,降低了多车通信系统的误码率,展示了较好的信道均衡和改善能力,性能优越。     

对调频斜率极性捷变SAR欠采样转发干扰

针对传统欺骗干扰难以对调频斜率极性捷变SAR（chirp rate polarity jittered SAR, CRPJ-SAR）形成有效干扰,研究了对CRPJ-SAR欠采样转发干扰。通过建立CRPJ-SAR有限时长欠采样转发干扰信号模型,分析了欠采样转发干扰对CRPJ-SAR的干扰效果。给出假目标数目、位置以及幅度的理论计算公式。在此基础上讨论了欠采样周期对干扰效果的影响。利用数字仿真验证了理论分析的正确性。     

中程空空导弹冲淡式干扰模型

中程空空导弹的末制导主动雷达一方面提高了中程空空导弹作战效能和载机的生成概率,另一方面也为对中程空空导弹实施冲淡式干扰提供了机会。基于冲淡式干扰的基本原理建立了中程空空导弹的冲淡式电子干扰模型,分析了各种不同攻防对策下的冲淡式干扰的效果及其变化趋势,在此基础上讨论了对抗双方在冲淡式电子对抗中的最优对策。     

对成像雷达的间歇采样非均匀转发干扰方法

间歇采样转发干扰是针对宽带成像雷达的一种有效干扰方式。根据间歇采样转发干扰的基本原理,对宽带成像雷达,按照常规的均匀转发方式,能够在高分辨距离像结果中叠加一串位置均匀分布的虚假散射点。虚假散射点序列的均匀分布特点不利于干扰信号的伪装。针对此问题,以破坏虚假散射点序列均匀分布为目的,在常规间歇采样转发干扰方法基础上,提出间歇采样非均匀转发干扰方法,并分析其干扰效果。最后通过仿真实验验证了所提出的方法能提高对宽带成像雷达的干扰效果。     

Anti-follower jamming wide gap multi-pattern frequency hopping communication method

This paper deals with the follower jamming (FJ) resistance for the frequency hopping (FH) communication system over additive white Gaussian noise (AWGN) channel. Conventional FH systems are susceptible to be jammed by FJ, and multi-pattern frequency hopping (MPFH) has good resistance to FJ. To further improve the FJ rejection capability of MPFH, we propose a wide gap multi-pattern frequency hopping (WGMPFH) scheme. WGMPFH uses channels to represent messages, and the data channel and complementary channel are hopping on orthogonal frequency slots according to wide gap FH patterns. The transmitted signal lures FJ to aim at the data channel and the complementary channel is away from FJ by adopting wide gap frequency patterns. FJ does not affect the complementary channel but increases the signal energy in the data channel, thus the effect of FJ is reduced. Its bit error rate (BER) is derived under FJ and the effects of three FJ parameters (tracking success probability, jamming duration ratio and jamming bandwidth ratio) on the BER performance of WGMPFH are investigated versus the conventional FH/BFSK and MPFH system. Numerical and simulation results show that when under the worst-case FJ, the proposed WGMPFH outperforms the MPFH by about 1–3 dB and outperforms the conventional FH/BFSK by more than 4 dB. The proposed WGMPFH shows superior jamming rejection performance under FJ especially in severe signal-to-jamming ratio (SJR).     

An approach for predicting digital material consumption in electronic warfare

Electronic warfare is a modern combat mode, in which predicting digital material consumption is a key for material requirements planning (MRP). In this paper, we introduce an insensitive loss function (ε) and propose a ε-SVR-based prediction approach. First, we quantify values of influencing factors of digital equipments in electronic warfare and a small-sample data on real consumption to form a real combat data set, and preprocess it to construct the sample space. Subsequently, we establish the ε-SVR-based prediction model based on “wartime influencing factors - material consumption” and perform model training. In case study, we give 8 historical battle events with battle damage data and predict 3 representative kinds of digital materials by using the proposed approach. The results illustrate its higher accuracy and more convenience compared with other current approaches. Taking data acquisition controller prediction as an example, our model has better prediction performance (RMSE = 0.575 7, MAPE (%) = 12.037 6 and R² = 0.996 0) compared with BP neural network model (RMSE = 1.272 9, MAPE (%) = 23.577 5 and R² = 0.980 3) and GM (1, 1) model (RMSE = 2.095 0, MAPE (%) = 24.188 0 and R² = 0.946 6). The fact shows that the approach can be used to support decision-making for MRP in electronic warfare.     

基于间歇采样转发干扰的ISAR群目标生成方法

基于间歇采样转发干扰理论,提出了一种ISAR二维群目标生成方法。采用伴飞式干扰机,对所掩护的目标回波信号进行间歇采样转发,在ISAR上形成逼真的虚假二维群目标图像;通过调整干扰机和目标的空间位置关系,生成二维假目标序列,并能模拟目标的动态姿态变化。在介绍了间歇采样转发干扰的基本原理后,阐述了伴飞式干扰原理,然后从理论上推导了了伴飞式干扰机的功率和空间位置要求,接下来着重分析了二维群目标生成的理论原因,指出了影响二维群目标分布的关键因素和群目标的姿态角变化规律,最后进行了仿真验证,结果表明了该方法的有效性。研究成果对于ISAR干扰机的设计和工程应用具有指导意义。     

基于增大虚警概率的干扰信号设计方法

为了对现代新体制雷达实施有效的干扰,提出了以增大虚警概率为目标的干扰信号设计原则,并以恒虚警处理为研究对象,运用该原则对干扰信号进行了分析,结果显示施加干扰后能够显著增大恒虚警处理器的虚警概率,使其不能维持在预先设计的低虚警率,表明了此干扰设计原则的有效性.     

多基地雷达在分布式压制干扰下探测区域

双基地雷达因为其收发分置有较好的抗干扰能力,从双基地雷达出发,由其雷达方程和干扰方程推导出多基地雷达探测区域的数学模型和受到分布式压制干扰探测区域的数学模型.在建立天线模型后,进行多基地雷达在有分布式干扰下和无干扰下的联合探测区域的研究与仿真,仿真结果该方法具有一定的指导和参考意义.