随机规划在无源TDOA定位系统布站中的应用

应用随机机会约束规划理论,研究了指定区域无源定位系统布站优化问题。针对无源定位站点部署研究存在的局限,从误差准则、截获准则和协同准则出发,建立了无源定位系统布站优化的随机机会约束模型。对三站定位问题进行了仿真,利用混合智能算法得到了不同情况下的最优布站策略。     

反解法在再入机动弹道设计中的应用研究

简要分析了一般的再入机动弹道设计方法,即正解法.针对正解法对模型依赖性强和对初值非常敏感的问题,提出了一种基于误差补偿的机动弹道设计方法——反解法.该方法从弹道终端出发反解弹道,将计算结果误差转化为机动点参数误差,再通过关机点或中制导的调整进行误差补偿,从而有利于命中精度和打击效果的实现.仿真结果表明,该方法计算简便,对工程应用有一定的参考价值.     

谈大学物理设计性实验的实现

根据多年的学习和教学经验,从实验方法的确定;测量方法的选择;测量仪器的选择与配套;测量条件与最佳参数的确定;实施方案的拟定等几个方面,探讨了做好设计性实验的方法和原则。     

仪器柔度标定误差对杨氏模量压入识别的影响

针对材料杨氏模量仪器化压入识别的2种代表性方法——Oliver-Pharr方法和Ma方法,通过有限元数值模拟分析了仪器柔度标定误差对杨氏模量识别精度的影响。结果表明：仪器柔度及压入载荷越大,由标定误差导致的杨氏模量识别误差越大;当材料较软且压入深度较大时,仪器柔度的标定误差甚至可能导致材料杨氏模量的识别结果为负值;通过比较证明,Ma方法比Oliver-Pharr方法具有较低的仪器柔度敏感性和较高的测试精度。     

航空磁探仪目标运动分析仿真研究

针对航空磁探仪目标运动分析问题,分析了目标运动要素确定方法。首先,采用蒙特卡洛仿真和统计分析法研究了目标运动要素估计误差的分布规律;然后,结合最小二乘定位法,给出了目标运动参数及其误差的简化算法;最后,分析了影响目标运动要素解算精度的主要因素。研究结果可为磁探仪的使用、攻潜武器的选择和攻潜效果的预测提供参考。     

Trajectory predictions of new lift separation sabots

This paper presents a modified analytical model to evaluate the trajectories of various lift separation sabot configurations. The aerodynamic forces acting on the sabot surfaces during a supersonic flight are modeled in the present analytical model by incorporating the pressures on the windward side of the sabot due to the detached/attached shock and its reflections and then integrated using the 3-DoF dynamical equations. The trajectory and the aerodynamic coefficients were obtained for these config-urations at a projectile Mach number of 3. The sabot configurations, which include two new designs, are compared with each other and with the conventional free flight trajectory data of the conventional sabots. The mechanical interaction between the sabot and projectile is also addressed in the present work. The comparison shows that the new designs with the aerodynamic surfaces close to the center of gravity, lift-off from the projectile with minimal mechanical interaction compared to a conventional sabot.     

A novel DOA estimation algorithm using directional antennas in cylindrical conformal arrays

In this paper, a novel direction of arrival (DOA) estimation algorithm using directional antennas in cy-lindrical conformal arrays (CCAs) is proposed. To eliminate the shadow effect, we divide the CCAs into several subarrays to obtain the complete output vector. Considering the anisotropic radiation pattern of a CCA, which cannot be separated from the manifold matrix, an improved interpolation method is investigated to transform the directional subarray into omnidirectional virtual nested arrays without non-orthogonal perturbation on the noise vector. Then, the cross-correlation matrix (CCM) of the sub-arrays is used to generate the consecutive co-arrays without redundant elements and eliminate the noise vector. Finally, the full-rank equivalent covariance matrix is constructed using the output of co-arrays, and the unitary estimation of the signal parameters via rotational invariance techniques (ESPRIT) is performed on the equivalent covariance matrix to estimate the DOAs with low computational complexity. Numerical simulations verify the superior performance of the proposed algorithm, especially under a low signal-to-noise ratio (SNR) environment.     

油料装备战场应急维修技术体系研究

从信息化战争对油料装备战场抢修快捷、有效和适时的要求出发,建立了油料装备战场应急维修技术体系,该体系由智能自修复维修技术、战场原位应急维修技术、伴随应急维修技术、定点应急维修技术和远程可视化应急维修技术五个层次组成,其关键技术是智能自修复技术和原位应急维修技术。采用新材料、新工艺、新技术实现维修敏捷化、精确化、信息化是油料装备战场应急维修技术的发展方向。     

加速度计动态误差系数标定的仿真研究

为了简化加速度计动态误差系数的标定过程,缩短标定试验时间,在建立加速度计动态误差数学模型的基础上,结合三轴转台模型及测试原理,一次性标定出加速度计动态误差系数,同时避免了角振动台的使用。最后利用MATLAB软件进行仿真试验,得到了较好的结果。     

基于星敏感器的陀螺仪误差参数实时修正

主要研究导弹发射升空以后,通过星敏感器测星实现对捷联惯导系统中陀螺仪误差参数的实时修正技术。从传统的星光制导原理出发,通过对数学平台系失调角的分析,论证了基于单星敏感器情况下的陀螺仪误差参数分离方法,并给出了具体的仿真结果,对实际系统的使用具有一定的指导意义。