Application of improved equivalent edge currents in synthetic aperture radar imaging

Target modeling and scattering function calculating are important prerequisites and groundwork for the synthetic aperture radar (SAR) imaging simulation. According to the difficult problems that normal methods cannot calculate the scattering function of electrically large object under the condition to wideband, an effective method of improved equivalent edge currents is presented and applied to SAR imaging simulation for the first time. This method improves calculating velocity and has relatively high precision. The concrete steps of applying the method are given. By way of the simulation experiment, the effectiveness of the method is verified.     

Person-independent expression recognition based on person-similarity weighted expression feature

A new method to extract person-independent expression feature based on higher-order singular value decomposition (HOSVD) is proposed for facial expression recognition. Based on the assumption that similar persons have similar facial expression appearance and shape, the person-similarity weighted expression feature is proposed to estimate the expression feature of test persons. As a result, the estimated expression feature can reduce the influence of individuals caused by insufficient training data, and henc...     

一种高分辨率谱估计与数据外推的快速算法

利用信号频谱幅度分布的先验信息,对短时数据序列信号提出了一种实现高分辨率谱估计和数据序列外推的快速算法。该算法利用了算子矩阵的特殊结构,采用简单、快速的矩阵求逆算法,使算法的运算量和数据存储容量大幅度下降。给出了算法在高分辨率谱估计及数据序列外推中的应用实例和仿真结果,证实了该算法的优良性能。     

一种新型神经网络控制器的研究

提出了一种新型神经网络控制器,其控制机理与PID控制相类似,但解决了常规PID控制存在的快速性与超调量的矛盾.给出了该神经网络控制器的自适应学习算法,分析讨论了控制系统的稳定性.仿真实验表明,这种新型神经网络控制器构成的自适应控制系统具有较强的适应性和鲁棒性.     

一种SAR图像目标识别方法

提出了一种新的合成孔径雷达 (SAR)图像目标检测和识别方法 ,该方法根据SAR图像统计分布特性 ,结合恒虚警检测算法和小波变换提取感兴趣的SAR图像目标特征 ,检测得到目标 ,采用马氏距离从杂波背景中识别该目标。实际SAR图像测试结果表明了该方法的有效性     

EXPLORATION/EXPLOITATION TRADEOFF WITH CELL-SHIFT AND HEURISTIC CROSSOVER FOR EVOLUTIONARY ALGORITHMS

In order to tradeoff exploration/exploitation and inspired by cell genetic algorithm a cellshift crossover operator for evolutionary algorithm （EA） is proposed in this paper. The definition domain is divided into n-dimension cubic sub-domains （cell） and each individual locates at an ndimensional cube. Cell-shift crossover first exchanges the cell numbers of the crossover pair if they are in the different cells （exploration） and subsequently shift the first individual from its initial place to the other individual＇s cell place. If they are already in the same cell heuristic crossover （exploitation） is used. Cell-shift/heuristic crossover adaptively executes exploration/exploitation search with the vary of genetic diversity. The cell-shift EA has excellent performance in terms of efficiency and efficacy on ten usually used optimization benchmarks when comparing with the recent well-known FEP evolutionary algorithm.     

不确定性决策中完全信息获得的事前分析

明确了规范决策分析中信息的概念,介绍了信息获得与否的价值判断法。然后主要针对不确定性决策完全信息获得的事前分析进行了讨论,给出了单状态完全信息获得的概念和一个实际分析例子;同时对完全信息与风险态度的关系进行了简单的分析。     

用神经网络实现线性系统状态估计

本文研究了一种用神经网络解决线性动态系统状态估计问题的方法。使用了动态优化技术设置Ｈｏｐｆｉｅｌｄ网络的加权矩阵。仿真结果显示本文研究的方法具有广泛的适用性。此方法对于大型系统实时估计具有很大的应用潜力。     

调制型捷联惯导系统可观测性分析及在线标定技术研究

针对调制型捷联惯导系统（modulated strapdown inertial navigation system, MSINS）,提出了惯性组件（inertial navigation unit, IMU）的在线标定路径设计原则。首先根据IMU输出误差模型建立了系统误差模型,而后利用该模型,分析了载体无加速运动且转台静止情况下的可观测性,分析结果表明该状态下有一半状态量不可观测;针对该现象,对系统模型进行了能观测性分解,通过分解结果观察无法估计的状态量,并且得到了分解后系统的可观测性矩阵,在此基础上,推导了满足该矩阵满秩的IMU运动原则,由此归纳出IMU在线标定路径设计原则;最后,利用仿真试验验证了该方法的正确性,半实物仿真试验验证了该方法的工程适用性。     

New rapid transfer alignment method for SINS of airborne weapon systems

Transfer alignment is an effective alignment method for the strapdown inertial navigation system （SINS） of airborne weapon systems. The traditional transfer alignment methods for large misalignment angles alignment use nonlinear transfer align- ment models and incorporate nonlinear filtering. A rapid transfer alignment method with linear models and linear filtering for ar- bitrary misalignment angles is presented. Through the attitude quaternion decomposition, the purpose of transfer alignment is converted to estimate a constant quaternion. Employing special manipulations on measurement equation, velocity and attitude linear measurement equations are derived. Then the linear trans- fer alignment model for arbitrary misalignment angles is built. An adaptive Kalman filter is developed to handle modeling errors of the measurement noise statistics. Simulation results show feasibili- ty and effectiveness of the proposed method, which provides an alternative rapid transfer alignment method for airborne weapons.