Comparison of robust H<Subscript>∞</Subscript> filter and Kalman filter for initial alignment of inertial navigation system

There are many filtering methods that can be used for the initial alignment of an integrated inertial navigation system. This paper discussed the use of GPS, but focused on two kinds of filters for the initial alignment of an integrated strapdown inertial navigation system （SINS）. One method is based on the Kalman filter （KF）, and the other is based on the robust filter. Simulation results showed that the filter provides a quick transient response and a little more accurate estimate than KF, given substantial process noise or unknown noise statistics. So the robust filter is an effective and useful method for initial alignment of SINS. This research should make the use of SINS more popular, and is also a step for further research.     

高频开关型充电整流电源在客车中的应用

简述了铁路客车上早期应用的铁磁谐振稳压电源及可控硅整流元件稳压电源的使用情况及缺点。文章着重介绍了高频开关 (TSR)整流电源的技术性能与应用     

一种适用于电气化铁路信息传输的主从结构自适应噪声对消器

提出采用一种新型的主从结构的自适应噪声对消器（MS-ANC），解决电气化铁路中的谐波干扰和高斯白噪声对消问题，计算机仿真实验表明，此噪声对消器能使输出信噪比得到较大的提高（信噪比改善15-40dB)。     

一类特殊对称滤波器族的构造

给出了一类对称多带正交小波滤波器的一般构造方法,得到滤波器族对应多相矩阵完全分解形式,完成了一个滤波器设计程序.由此程序,不但可以给出一类多带小波滤波器族参数表示,还可以用来刻划滤波器族代数结.     

A methodology for vehicle sideslip angle identification: comparison with experimental data

Sideslip angle could provide important information concerning vehicle's stability. Unfortunately direct measurement of sideslip angle requires a complex and expensive experimental set-up, which is not suitable for implementation on ordinary passenger cars; thus, this quantity has to be estimated starting from the measurements of vehicle lateral/longitudinal acceleration, speed, yaw rate and steer angle. According to the proposed methodology, sideslip angle is estimated as a weighted mean of the results provided by a kinematic formulation and those obtained through a state observer based on vehicle single-track model. Kinematical formula is considered reliable for a transient manoeuvre, while the state observer is used in nearly quasi-state condition. The basic idea of the work is to make use of the information provided by the kinematic formulation during a transient manoeuvre to update the single-track model parameters (tires cornering stiffnesses). A fuzzy-logic procedure was implemented to identify steady state or transient conditions.     

基于能量理论的挡土墙的被动土压力分析

从能量理论出发,导出任意情形下挡土墙被动土压力的计算公式,探讨破裂角的计算方法.与传统的朗金和库伦计算方法相比,该方法应用范围较广,计算结果较为符合实际.     

基于碳化硅材料柴油机颗粒过滤器开发与试验

阐述了碳化硅为原材料的柴油机颗粒过滤器生产工艺,并对载体的微观结构进行SEM分析和用压汞仪测试,结果表明重结晶碳化硅过滤器微孔分布均匀一致;对载体进行适应性涂敷试验,SEM分析结果表明:含有催化剂浆料可以均匀地涂敷在碳化硅晶粒上;载体对PM的过滤效率进行了发动机台架测试,过滤效率高达99%。     

基于SPN-PF模型的行人跟踪算法改进

结合粒子滤波和神经网络方法提出了一种新的自适应的行人跟踪改进算法.根据行人跟踪经常出现的遮挡,失跟,误跟等问题,提出了一个SPN-PF模型,通过Sigma-Pi网络将行人的多个特征联系在一起,经过学习和计算,进一步讲结果运用到粒子滤波方法中,从而达到可靠准确的跟踪行人目标的目的.实验结果表示该文提出的方法能够更准确的对行人进行跟踪.     

北斗／INS 组合导航滤波算法的研究

为了提高北斗定位系统定位定姿的精度及性能,利用惯性导航系统（inertial navigation system ,INS）姿态信息进行辅助,建立BDS／INS组合定位算法。通过INS输出信息与BDS观测信息紧组合的方式,以北斗导航卫星系统的伪距以及伪距率作为子系统状态量,利用卡尔曼滤波方法将卫导观测信息与惯导导航参数融合在一起进行计算。通过实际仿真实验表明,相比于原系统算法,组合后的算法能有效地提高BDS定位的精度和成功率。     

捷联航姿系统航行状态下的组合对准算法研究

由于捷联航姿设备无纬度解算值,导致跨纬度航行时航向误差过大,引入计程仪速度与航姿设备输出姿态、航向一起对纬度值进行计算,航行状态引入计程仪信息后建立数学模型进行初始对准,经航行实验验证,72小时内航向角误差得到了极大的缩小,验证了该数学模型的可行性,可提高设备的精度,具有实际使用意义。