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本文介绍了对测控站点内各测控设备的电磁干扰进行分析和预测的方法。系统采用干扰源与接收机逐对考虑的方式,极大简化了计算。并采用分阶段预测的方法,即分成:快速筛选、幅度筛选、频率筛选和详细预测四个阶段进行逐阶段分析和预测。 相似文献
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分析了有源干扰信号进入舰载雷达侦察机的条件;根据有源干扰信号特征,讨论了其对雷达侦察装备的影响机理;采用半实物仿真方法验证了压制干扰信号对雷达侦察装备的信号分选能力产生较为直接的影响。 相似文献
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随着雷达军事需求的更加广泛和迫切,未来雷达装备的有效性将越来越依赖于雷达信号处理机的性能,而不同功能和用途的雷达可以采用通用的雷达数字接收机,因此未来的雷达不仅是数字化的,而且将是软件雷达。本文引入了软件雷达的概念,分析了软件雷达的军事需求和关键技术,论述了实现软件雷达的工程可行性和发展前景,最后对我军雷达装备的发展提出了建议。 相似文献
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以保障活动为中心的装备保障资源数量预测 总被引:5,自引:0,他引:5
根据保障资源在装备使用任务活动和装备保障活动中被消耗或占用的特点提出了以保障活动为中心的保障资源预测方法。以装备的运行活动为驱动,结合装备的可靠性、维修性和测试性等设计特性,建立装备使用任务与装备保障活动之间的关系,对保障活动的频度和时域特征进行抽象。根据保障资源使用特点进行分类,归纳了以保障活动为中心的装备保障资源预测的输入条件。从消耗性资源和占用性资源两个方面分别建立了保障资源需求量预测模型,可以在一个特定阶段内对保障站点内的装备群保障资源平均需求量进行预测,并用飞机装备进行了案例验证,可为研制部门进行保障资源数量预测提供有效的理论和技术支持。 相似文献
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为满足雷达装备不断增长的保障需求,研制了一套便携式雷达装备检测系统,该检测系统的核心组成部分是超宽带雷达信号模拟器。模拟器采用低频段基带信号与高频段本振信号2次混频来模拟产生0.05~16 GHz范围内多种体制的雷达信号,最后完成了电路实现,经过信号测试各项指标均达到设计要求。 相似文献
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在简要介绍了粒子群优化算法基本原理的基础上,建立了基于POS_LS-SVM的装备研制费用预测模型,并应用实例进行了验证。结果表明,采用PSO_LS-SVM方法进行装备研制费用预测,得到的预测结果精度更高、计算速度更快。 相似文献
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导弹装备的故障间隔时间是其可靠性参数的重要指标,通过分析导弹装备的特点,建立了故障间隔时间预测模型.考虑到导弹装备的故障数据量有限,用一般方法准确地预测很困难,因此提出用灰色预测模型进行预测的方法,建立了GM(1,1)预测模型并用数据进行验证.验证结果表明该方法具有很好的预测精度,可用于装备故障间隔时间的预测和估算. 相似文献
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基于CBR的机载雷达故障诊断专家系统研究 总被引:4,自引:0,他引:4
以故障诊断的理论和方法为基础,综合运用神经网络、基于案例推理(CBR)和专家系统理论,对雷达装备的故障诊断问题进行研究,形成一个集成的智能诊断专家系统。介绍了系统的总体结构和工作原理,并给出具体的诊断实例,此方法充分利用神经网络和CBR的优点,将提高雷达装备故障诊断的正确性和效率。 相似文献
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从反舰导弹的威胁分析入手,介绍了舰载反导电子干扰的主要方法与仿真系统结构,详细介绍了一种舰载干扰投放器的模拟实现。 相似文献
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Generalized equations are developed to evaluate the effects of interference upon communications systems. Interference may be due to natural causes and accidental or sophisticated jamming. One- and two-way communication systems are considered. The equations are applicable to near and deep space communication links as well as radar in both friendly and unfriendly environments. Both mainlobe and sidelobe reception and collocated and diversely located interference and signal sources may be analyzed. A practical discussion for each of the variables, as well as a sample solution, is included. 相似文献
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基于CFD的电磁散射数值模拟 总被引:1,自引:0,他引:1
计算流体力学(CFD)技术中的时域有限体积法(FVTD)被推广到计算电磁学中,直接数值求解时变麦克斯韦方程组.FVTD使用电磁场矢量共置于网格单元中心、散射场积分形式的麦克斯韦方程组守恒形,空间离散使用基于特征值的近似黎曼解构建网格单元边界通量,时间推进采用四阶龙格-库塔法.TM和TE波极化下几种二维完全导电体的表面诱导电流密度和雷达散射截面(RCS)计算验证表明,时域有限体积法是一种高精度有效的时域方法. 相似文献
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If modern airborne radar systems are to function properly, the radar antenna radiation patterns must meet certain specifications. Until recently, most radar antennas were designed and tested in a clean antenna environment, i.e., there is no near field scattering from host structures or radome effects. However, these higher order effects are the matter of increasing concern with added performance demands in the ever-increasing jammer and clutter interference environments. We investigated the capabilities and limitations of currently available analysis techniques and computer codes for installed performance of airborne radar antenna systems. Then we developed an extended ray-optical technique that could predict total installed performance of airborne radar antenna systems, i.e., the near field scattering from aircraft structures and radome effects. The new analysis technique utilized a ray-tracing method in both airframe and radome simulation. Thus, it can efficiently predict the total installed performance of large radar antenna systems on an aircraft structure 相似文献
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Radio interference generated in a helicopter-borne continuous wave (CW) Doppler radar system due to the rotating blades is analyzed. This problem has been previously treated for the case of pulse Doppler radar systems with very narrow (near zero) beamwidth. In this case the strong interference component returning directly from the blades (with no ground reflection) need not be considered as it reaches the receiver when it is still blinded. In the case of a CW Doppler radar, however, this interference component must be included. Numerical calculations show that the total blade interference power level, dominated by the direct component, is higher than that of the direct ground clutter in the radar clutter region. It decreases approximately as (f - fo)-4 in the radar clear region. It stays, however, well above the thermal noise level which might cause false alarm and degrade the radar performance. 相似文献
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Kirsch Alan L. Zeiger Kenneth K. Resinski Lawrence J. Rosenbaum Mitchell H. 《IEEE transactions on aerospace and electronic systems》1968,(1):9-23
The PRSD detector improves radar performance by controlling the distribution of energy in space, thus making a radar adaptive to its environment. An increase in performance over classical detectors may be realized in any of several ways: 1) greater maximum range; 2) smaller minimum detectable targets; 3) higher data rates; 4) lower average transmitted power, which allows smaller size and weight of equipment. The model of the PRSD detector described herein was tested with a semi-agile beam radar, and gave measured field performance improvement (for this particular radar) equivalent to an S/N increase ranging from 5 to 22 dB with a mean of 9.5 dB. This increase is greater than the 5-dB improvement predicted for the system in a white noise environment because many of the field tests were at locations subjected to heavy interference. The PRSD detector was extremely effective reducing the interference. In this paper, we will briefly review the theory of operation, describe the equipment and the method of test, and present experimental data. The data presented here are essential to a complete understanding of sequential detection since a rigorous theory encompassing multiple range bin radar has not been developed at this time. Finally, an extensive bibliography is appended. 相似文献
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Fabrizio G.A. Gershman A.B. Turley M.D. 《IEEE transactions on aerospace and electronic systems》2004,40(2):510-525
Adaptive beamforming is used to enhance the detection of target echoes received by high frequency (HF) surface wave (HFSW) over-the-horizon (OTH) radars in the presence of spatially structured interference. External interference from natural and man-made sources typically masks the entire range-Doppler search space and is characterized by a spatial covariance matrix that is time-varying or nonstationary over the coherent processing interval (CPI). Adaptive beamformers that update the spatial filtering weight vector within the CPI are likely to suppress such interference most effectively, but the intra-CPI antenna pattern fluctuations result in temporal decorrelation of the clutter which severely degrades subclutter visibility after Doppler processing. A robust adaptive beamformer that effectively suppresses spatially nonstationary interference without degrading subclutter visibility is proposed here. The proposed algorithm is computationally efficient and suitable for practical implementation. Its operational performance is evaluated using experimental data recorded by the Iluka HFSW OTH radar, located near Darwin in far north Australia. 相似文献