弹道目标跟踪滤波方法研究

主要对弹道目标的跟踪滤波方法进行了综述,对扩展卡尔曼滤波（extended Kalman filter,EKF）、转换测量卡尔曼滤波（conversion measurement Kalman filter, CMKF）、基于弹道运动方程的扩展卡尔曼滤波（ballistic extended Kalman filter, BEKF）、基于弹道运动方程的无敏卡尔曼滤波（ballistic unscented Kalman filter, BUKF）4种滤波算法的关键点、优缺点进行了剖析。进一步利用仿真的弹道数据对4种滤波方法的效能进行了验证,对比了不同滤波器的滤波精度和再入目标的跟踪性能,分析了质阻比对滤波性能的影响,提出了选择和设计目标跟踪滤波方法时需要考虑的几个问题,为雷达滤波方法的选择和设计提供参考和依据。     

Driving force coordinated control of an 8 ×8 in-wheel motor drive vehicle with tire-road friction coefficient identification

Because of the complexities of tire-road interaction,the wheels of a multi-wheel distributed electric drive vehicle can easily slip under certain working conditions.As wheel slip affects the dynamic per-formance and stability of the vehicle,it is crucial to control it and coordinate the driving force.With this aim,this paper presents a driving force coordination control strategy with road identification for eight-wheeled electric vehicles equipped with an in-wheel motor for each wheel.In the proposed control strategy,the road identification module estimates tire-road forces using an unscented Kalman filter al-gorithm and recognizes the road adhesion coefficient by employing the recursive least-square method.According to road identification,the optimal slip ratio under the current driving condition is obtained,and a controller based on sliding mode control with a conditional integrator uses this value for accel-eration slip regulation.The anti-slip controller obtains the adjusting torque,which is integrated with the driver-command-based feedforward control torque to implement driving force coordination control.The results of hardware-in-loop simulation show that this control strategy can accurately estimate tire-road forces as well as the friction coefficient,and thus,can effectively fulfill the purpose of driving force coordinated control under different driving conditions.     

A study on the surface overpressure distribution and formation of a double curvature liner under a two-point initiation

The formation mechanism of an EFP(explosively formed projectile) using a double curvature liner under the overpressure effect generated by a regular oblique reflection was investigated in this paper.Based on the detonation wave propagation theory,the change of the incident angle of the detonation wave collision at different positions and the distribution area of the overpressure on the surface of the liner were calculated.Three-dimensional numerical simulations of the formation process of the EFP with tail as well as the ability to penetrate 45# steel were performed using LS-DYNA software,and the EFP ve-locity,the penetration ability,and the forming were assessed via experiments and x-ray photographs.The experimental results coincides with those of the simulations.Results indicate that the collision of the detonation wave was controlled to be a regular oblique reflection acting on the liner by setting the di-mensions of the unit charge and maintaining the pressure at the collision point region at more than 2.4 times the CJ detonation when the incident angle approached the critical angle.The distance from the liner midline to the boundary of the area within which the pressure ratio of the regular oblique reflection pressure to the CJ detonation pressure was greater than 2.5,2,and 1.5was approximately 0.66 mm,1.32 mm,and 3.3 mm,respectively.It is noted that pressure gradient caused the liner to turn inside out in the middle to form the head of the EFP and close the two tails of the EFP at approximately 120μs.The penetration depth of the EFP into a 45# steel target exceeded 30 mm,and there was radial expansion between the head and tail of the EFE increasing the penetration resistance of the EFP.Therefore,the structural size of the unit charge and the liner can be further optimized to reduce resistance to increase the penetration ability of the EFP.     

基于落点能量的舰炮制导炮弹对岸射击技术

针对新型舰炮采用制导炮弹对岸打击的作战需求,提出了一种基于落点能量最优的射击诸元解算方法,以提高制导炮弹末端动能,增加对目标的毁伤能力。建立制导炮弹外弹道模型,采用终端落角约束的制导律,并以落点能量最优为约束条件,优化选取制导炮弹初速与射角,解算射击诸元。经仿真分析,该方法可有效进行新型舰炮武器系统制导炮弹对岸打击的火控解算。     

基于TOA差值矩阵的雷达脉冲序列PRI识别方法

针对雷达脉冲序列的主要特点,利用TOA(脉冲到达时间)差值矩阵探索PRI(脉冲重复间隔)的识别问题.设计了一种新方法,首先由TOA序列求出TOA差值矩阵,再求出TOA差值矩阵的逆矩阵,分析TOA差值矩阵逆矩阵的特殊结构,得到PRI的识别结果.通过研究重频固定、脉冲丢失和重频参差三种情况下的PRI识别问题,说明了该方法用于雷达脉冲序列PRI识别的可行性.     

舰空导弹脱靶量测量方法研究

针对舰空导弹脱靶量测量方法在导弹试验中不能满足要求的现状,在介绍了目前舰空导弹脱靶量测量技术现状及存在缺陷的基础上,重点提出了基于全球定位原理和技术实现的舰空导弹脱靶量测量的新方法.应用此方法,不仅可以实现全天候、高精度、机动化的舰空导弹脱靶量测量,而且精度可达亚米级.     

树状小波与多尺度估计理论的图像融合技术

针对红外和可见光图像的特点及相互融合的应用,提出一种基于树状小波多尺度估计理论的红外与可见光图像融合算法.首先对源图像进行树状小波多尺度分解,依据子图像的信息量得到塔式结构子图像;然后基于不同子图像对应层上的对应像素,根据EM算法估计模型参数,采用SAGE迭代算法优化估计参数得到融合子图像;最后根据小波逆变换获得融合图像.实验结果表明:该融合算法能够更好地综合利用红外图像较好的目标指示特性与可见光图像较清晰的场景信息;性能评估显示:该算法得到的融合图像互信息较文献[5,6]分别提高了49.60%和24.90%,均方根误差分别减小了66.40%和56.00%.     

老子的战争观与军事战略(上篇)——“不以兵强天下”与建立和谐世界

<老子>一书中包含有非常丰富精彩的军事指导思想.老子虽然认为在"不得已"的情况下,也可以暂时凭借战争的手段来达到一定有限的政治目的,同时老子也强调不应该对战争进行赞扬,更不能以兵逞强,忘乎所以,而应"恬淡为上,胜而不美".所以老子对战争基本持反对和否定的态度,主张无为而治,"不以兵强天下"、"谦下"的思想,以此而建立不见干戈,安居乐业的和谐世界.