排序方式: 共有79条查询结果,搜索用时 218 毫秒
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预警机红外对抗技术分析及其对抗措施 总被引:1,自引:1,他引:0
基于预警机红外对抗的特点和战术运用,建立了预警机红外干扰弹对抗红外制导导弹的数学模型,对其干扰效果作了初步分析,并提出了一些针对预警机红外弹的对抗措施. 相似文献
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灵巧干扰对Taylor四相码信号的干扰效果分析 总被引:4,自引:0,他引:4
介绍了Taylor四相码的产生和性能,针对其带外频谱衰减快、辐射频谱宽度窄而难于干扰的特点,结合噪声干扰和欺骗干扰的特性对Taylor四相码进行灵巧干扰.通过Matlab仿真验证了灵巧干扰的有效性,并给出了干扰模型与仿真结果. 相似文献
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《Digital Communications & Networks》2021,7(3):327-334
Dynamic spectrum sharing and cognitive radio networks were proposed to enhance the Radio Frequency (RF) spectrum utilization. However, there are several challenges to realize them in real systems, such as sensing uncertainty causing issues to licensed users, business models for licensed service providers. Wireless virtualization is regarded as a technology that leverages service level agreements to sublease unused or underutilized RF spectrum that addresses aforementioned issues and helps to significantly enhance the utilization of the RF spectrum, offer improved coverage and capacity of networks, enhance network security and reduce energy consumption. With wireless virtualization, wireless networks' physical substrate is shared and reconfigured dynamically between virtual wireless networks through Mobile Virtual Network Operations (MVNOs). Wireless virtualization with dynamic configurable features of Wireless Infrastructure Providers (WIPs), virtualized wireless networks are vulnerable to a multitude of attacks, including jamming attacks and eavesdropping attacks. This paper investigates a means of defense through the employment of coalition game theory when jammers try to degrade the signal quality of legitimate users, and eavesdroppers aim to reduce secrecy rates. Specifically, we consider a virtual wireless network where MVNO users' job is to improve their Signal to Interference plus Noise Ratio (SINR) while the jammers target to collectively enhance their Jammer Received Signal Strength (JRSS), and an eavesdropper's goal is to reduce the overall secrecy rate. Numerical results have demonstrated that the proposed game strategies are effective (in terms of data rate, secrecy rate and latency) against such attackers compared to the traditional approaches. 相似文献
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部分频带噪声干扰(PBNJ)是一种主要的窄带干扰,它对通信系统性能的影响十分突出。该文针对FH/ MFSK系统中,传统的部分频带干扰模型的干扰带宽最小分辨率是一个跳频子带带宽(即MFSK信号的带宽),研究了更具有实际价值的新的部分频带干扰模型,即将干扰带宽最小分辨率精确到MFSK信号带宽的1/M。该文推导了莱斯衰落信道下的误比特率(BER)公式,给出了其闭合表达式,并通过计算机仿真验证了理论推导的正确性。理论分析与仿真结果表明,M,Nh,越小,传统与新PBNJ模型下FH/MFSK信号的BER性能差异就越大。 相似文献
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现代电子战中雷达有源欺骗干扰,特别是转发式欺骗干扰,已对雷达构成了严重的威胁。本文针对阵列雷达中有源欺骗干扰抑制问题,研究了一种空域-极化域联合处理的抑制方法。该方法采用矩阵法测量目标和干扰的空域及极化域参数;然后借助子空间投影理论构建滤波算子;进而在由空域和极化域组成的联合域上滤除欺骗干扰并提取目标回波,从而达到干扰抑制的目标。该算法采用信干噪比改善因子来衡量其性能,同时推导了改善因子的理论上限。该算法具有较低的复杂度,大量计算机仿验证其性能。仿真结果表明,算法不仅有良好的欺骗干扰抑制效果,并且在一定程度上也抑制了噪声;当SNR>10dB,参数估计相对误差小于0.1,抑制前后回波相关系数大于90%,干扰和噪声抑制度大于10dB。 相似文献