飞机射频隐身性能评估指标研究与软件实现

发布时间：2018-01-13 07:19

本文关键词：飞机射频隐身性能评估指标研究与软件实现　出处：《南京航空航天大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着无源探测技术的发展,飞机隐身不再局限于雷达隐身以及红外隐身等。无源探测系统作用距离远、无射频辐射、隐蔽性好等特点使得飞机射频隐身技术的研究越来越具有实用价值。如何实现飞机射频隐身也是世界军事强国研究的重点与难点。针对飞机射频隐身性能评估及其软件实现,本文主要的研究内容与结果如下:(1)分析了飞机射频目标特征参量与射频隐身性能参量的表征方法。针对射频目标特征参量的特点,分析了射频辐射强度、信号脉间以及脉内不确定性等射频目标特征参量的表征方法;给出了用条件熵表征信号脉间不确定性的方法,相对于射频不确定性熵,条件熵更加全面的衡量了机载辐射脉冲信号脉间参数(载频、脉宽、脉冲重频)捷变引起的脉间不确定性;针对射频隐身性能参量的特点,分析了截获距离、截获因子、截获球半径以及截获概率等射频隐身性能表征参量。同时从频域、时域、能量域和空域截获条件出发,重点分析了影响截获概率的因素。为射频隐身评估软件系统的实现奠定了基础。(2)研究了复杂条件下的射频隐身性能表征方法。针对电子对抗中外部噪声干扰问题,分析了外部噪声干扰对截获距离、截获因子等的影响,并通过仿真给出了一种通过干扰无源探测系统来提高射频隐身效果的方法;针对空对地/海面对抗场景,研究了影响截获概率的重要因素:波束覆盖面积;针对空对空对抗场景,给出了飞机截获概率的表征方法:联合截获概率。仿真结果表明截获概率随着辐射源的掠射角增大或者主瓣波束宽度增大而增大。(3)设计并实现了飞机射频隐身性能评估软件系统。首先,进行了软件系统的总体设计以及各子模块的设计。针对截获距离与截获球半径的计算复杂度,分别给出了牛顿迭代法以及归一化软件实现方法,在满足计算精度的前提下减少了计算时间,提高了软件系统的实时性。此外,进行了系统的输入输出、综合显示等各项功能测试。测试结果表明,仿真系统运行可靠,仿真结果正确。仿真系统具有良好的扩展性,可以满足系统未来的半实物仿真研究的需要。(4)给出了机载雷达抗分选识别性能表征参量:识别容量。建立了基于无源探测系统的识别容量基本模型,研究了信噪比以及待识别目标特征维数对识别容量的影响;分析了有、无脉冲遗漏两种情形下的识别容量,并通过与最小误判准则下的正确识别概率对比验证了识别容量表征机载雷达抗分选识别性能的有效性。研究表明,机载雷达识别容量越大,抗分选识别性能越差;基于识别容量,给出了跳频信号参数设计的方法。通过数值分析验证了跳频信号参数设计的正确性与有效性。
[Abstract]:With the development of passive detection technology, aircraft stealth is no longer limited to radar stealth and infrared stealth. The characteristics of good concealment make the research of aircraft radio frequency stealth technology more and more practical value. How to realize the aircraft radio frequency stealth is also the focus and difficulty of the research of the world military power. Its software implementation. The main contents and results of this paper are as follows: (1) the characterization methods of the radio frequency target characteristic parameters and the radio frequency stealth performance parameters are analyzed. According to the characteristics of the radio frequency target characteristic parameters, the radio frequency radiation intensity is analyzed. The representation method of radio frequency target characteristic parameters, such as inter-pulse and intra-pulse uncertainty, etc. In this paper, a method to characterize the uncertainty between signals with conditional entropy is presented. Compared with the entropy of radio frequency uncertainty, the conditional entropy measures the parameters (carrier frequency and pulse width) of airborne radiating pulse signal more comprehensively. Pulse repetition) interpulse uncertainty caused by agility; According to the characteristics of RF stealth performance parameters, the parameters of RF stealthy performance, such as intercept distance, interception factor, intercept radius and probability of interception, are analyzed. At the same time, in frequency domain, time domain. Energy domain and airspace interception conditions. The factors influencing the probability of interception are analyzed emphatically, which lays a foundation for the realization of RF stealth evaluation software system. The methods of characterization of RF stealth performance under complex conditions are studied, and the external noise interference in electronic countermeasures is studied. The influence of external noise interference on interception distance and interception factor is analyzed, and a method to improve radio frequency stealth effect by jamming passive detection system is given by simulation. For the air-to-surface / sea surface confrontation scenario, the important factors affecting the probability of interception are studied: the coverage area of the beam; For air-to-air combat scenarios. The joint interception probability is presented. The simulation results show that the interception probability increases with the increase of the grazing angle of the emitter or the beam width of the main lobe. Design and implementation of aircraft RF stealth performance evaluation software system. First. The overall design of the software system and the design of each sub-module, aiming at the computational complexity of the intercept distance and the radius of the intercepting sphere, the Newton iteration method and the normalized software implementation method are given respectively. Under the premise of satisfying the calculation accuracy, the calculation time is reduced, and the real-time performance of the software system is improved. In addition, the input and output of the system and the comprehensive display are tested. The test results show that. The simulation system runs reliably and the simulation results are correct. The simulation system has good expansibility. It can meet the needs of the future hardware-in-the-loop simulation of the system. (4) the identification capacity of airborne radar anti-sorting recognition performance is presented, and the basic model of recognition capacity based on passive detection system is established. The influence of signal-to-noise ratio (SNR) and feature dimension of target to be identified on the recognition capacity is studied. The recognition capacity of the two cases without pulse omission is analyzed. By comparing with the correct recognition probability under the minimum error criterion, the effectiveness of the recognition capacity to characterize the anti-sorting performance of airborne radar is verified. The research shows that the larger the recognition capacity of airborne radar is, the greater the recognition capacity is. The worse the performance of anti-sorting identification; Based on the identification capacity, the design method of frequency hopping signal parameters is presented, and the correctness and validity of the frequency hopping signal parameter design are verified by numerical analysis.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：V218

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