MIMO雷达发展现状与趋势

MIMO雷达是近年引入雷达领域的一种性能改善的新体制雷达.在对MIMO雷达的发展现状进行研究后,介绍了其工作原理及相关分类.提出了将MIMO技术与现有雷达系统相结合的应用路线.它能够有效解决现有雷达系统中的一些固有难题.最后根据MI-MO雷达的发展趋势,提出了今后MIMO雷达应用方向.     

Meteor radar temperatures over Collm (51.3°N, 13°E)

The method of obtaining absolute temperature estimates by measuring the ambipolar diffusion coefficient with meteor radars in the mesopause region is basically well known. However, there is still a need to refine and adjust the background temperature gradient model which is necessary to calculate the temperature values. Therefore, a detailed comparison with independent temperature measurements is necessary to evaluate the performance of the method and to obtain more information about the temperature gradient. Recent studies provide some evidence that the impact of the gradient model on temperature estimates affects the absolute temperatures, but that it is of minor importance for wave analysis. This paper focuses on a detailed evaluation of the meteor radar temperatures by comparing them with SABER satellite and OH-emission mesopause region temperatures. The seasonal variation of the observed temperatures is well reproduced by the COMMA general circulation model.     

Navigation Accuracy Category-Position Models and Estimate Position Uncertainty Calculations for TIS-B System

Navigation accuracy category-position (NACp) is an important parameter for system accuracy of traffic information service-broadcast (TIS-B), which is determined by estimate position uncertainty (EPU). Centered about the problems that the existing EPU calculation based on noise measurement is low in accuracy and unfit for describing uncorrected biases in target reports, this article analyses the traditional NACp model, and uses the least square estimation (LSE) in EPU calculation. Furthermore, it proposes an extended NACp model, which considers both noise and biases and acquires EPU estimation with the help of approximate multiplex Taylor expression. Analysis and simulation show that the proposed method not only leads to significant improvement of the accuracy of EPU calculation, but is fit for EPU calculation with tracking biases in TIS-B system as well. As such it can find application in practice to depict different kinds of error models in TIS-B system.     

置于敌雷达下概率最小的导弹飞行路径研究

研究了导弹置于敌方雷达下概率最小的飞行路径问题。分析了导弹飞行路径的全局最优解,以此为基础,进一步推导了导弹的最优路径、最优路径的长度及所消耗能量最小的数学模型。最优路径的数学模型与三叶Rose函数相近,建立了此最优解与Rose函数的关联并对结果进行了讨论。由此算法得到的导弹的飞行航迹能尽量绕过敌方的雷达威胁,有效地提高了导弹的生存概率。     

ALGORITHMS FOR TRACKING MANEUVERING TARGET WITH PHASED ARRAY RADAR

Ｓｉｎｃｅｐｈａｓｅｄａｒａｙｒａｄａｒｃａｎａｌｏｃａｔｅｔｈｅｒａｄａｒｒｅｓｏｕｒｃｅｓｆｌｅｘｉｂｌｙ，ｉｔｈａｓｔｈｅｐｏｔｅｎｔｉａｌｔｏｆｕｒｔｈｅｒｉｍｐｒｏｖｅｔｈｅｐｅｒｆｏｒｍａｎｃｅｏｆｔｒａｃｋｉｎｇｍａｎｅｕｖｅｒｉｎｇｔ...     

捷变频雷达导引头射频环境仿真及其关键技术

介绍了捷变频雷达导引头的信号特征和对捷变频雷达射频环境仿真的基本方法。着重讨论了瞬时测频仿真方案和射频延迟线仿真方案的工程实现和关键技术 ,指出改进频率校准方法提高频率引导精度是瞬时测频仿真方案的关键技术 ;发展低损耗、宽频带、延迟时间连续可调的高性能射频延迟线是射频延迟线仿真方案的关键技术。对两种仿真方案的特点进行了比较。     

非正态雷达杂波基带调制数据的数学产生方法

采用概率统计计算中的反变换法和接受-拒绝法研究生成了幅度上服从瑞利分布、韦伯尔分布、莱斯分布、K分布和对数正态分布的非正态杂波基带调制数据,通过希尔伯特变换,生成I、Q随机数序列,并用MATLAB进行仿真。利用FPGA等实时产生出的雷达杂波基带I、Q随机数序列,经过数字正交上变频器即可产生出雷达杂波中频模拟干扰信号。     

ANALYSIS OF THE RETURNED SIGNAL MODEL IN BISTATIC RADAR SYSTEMS

ＡＮＡＬＹＳＩＳＯＦＴＨＥＲＥＴＵＲＮＥＤＳＩＧＮＡＬＭＯＤＥＬＩＮＢＩＳＴＡＴＩＣＲＡＤＡＲＳＹＳＴＥＭＳＹｉｎＣｈｅｎｇｙｏｕ，ＸｕＳｈａｎｊｉａ，ＷａｎｇＤｏｎｇｊｉｎ，ＺｈｏｕＬｉｎｙｕｎ（ＤｅｐａｒｔｍｅｎｔｏｆＥｌｅｃｔｒｏｎｉｃＥｎｇｉ...     

雷达截获系统电子攻击布站研究

为了阻碍雷达截获系统对雷达信号的有效分选,电子攻击信号源的布站是一个关键。根据电子攻击信号脉冲与被保护雷达信号脉冲在重叠时间大小以及先后到达顺序上的不断变化,对某一被保护雷达,给出了电子攻击信号源的布站模型。通过计算,得出了保护该雷达的电子攻击信号源布站区域。最后,给出了一种工程应用布站方法。     

ATM中的ADS—SSR数据融合模型和算法

民航空中交通管理系统的核心是信息处理，根据民航用空中交通管理系统与军方用空中交通管理系统的不同特点，通过对一个可能的ＡＤＳ－ＳＳＲ数据融合模型的探讨，给出了此模型的具体算法。本算法综合了两者的优点，可实现整个飞行过程的无间断的可靠的监视，并且在高密度终端区提供必要的数据精度