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电动无杆飞机牵引车（图）
电动无杆飞机牵引车 电池 电驱动
2021/4/23
电动无杆飞机牵引车为张军副教授与西安睿诺航空装备有限公司联合开发，系统以电池为系统动力，具有电液混动功能，液压动作实现飞机的抱轮、提升动作，电驱动实现牵引车的行驶和转向，可实现10t飞机的牵引要求。
针对稀疏分解冗余字典中原子数量庞大的缺点，该文提出一种三阶多项式相位信号的快速稀疏分解算法。该算法根据三阶多项式相位信号的特点，把原有信号变换成两个子空间信号，并根据这两个子空间信号构建相应的冗余字典，然后采用正交匹配追踪法来完成其稀疏分解，最后利用稀疏分解原理完成原有信号的稀疏分解。该算法把原有信号变换成两个不同子空间信号，构建了两个不同的冗余字典，对比采用一个冗余字典库，这种采用两个冗余字典的...
Precision Landing Tests with Improved Integrity Beacon Pseudolites
Precision Landing Tests eacon Pseudolites
2015/6/29
Stanford’s Integrity Beacon Landing System uses ground-based pseudo-satellite transmitters known as Integrity Beacons to resolve carrier phase ambiguities on final approach, giving IBLS both high inte...
High Integrity Multipath Mitigation Techniques for Ground Reference Stations
High Integrity Multipath Mitigation Techniques Ground Reference Stations
2015/6/29
There is an increasing demand for accuracy, integrity,continuity and availability in the ongoing develop ment of differential GPS (DGPS) techniques. DGPS performance relies on the elimination of error...
The Next Generation Integrity Monitor Testbed (IMT) for Ground System Development and Validation Testing
Generation Integrity Monitor Testbed (IMT) Ground System Validation Testing
2015/6/29
The Stanford University Integrity Monitor Testbed (IMT) is a prototype of the Local Area Augmentation System (LAAS) Ground Facility (LGF). It is used to evaluate whether the LGF can meet the integrity...
A Non-Linear,Two-Step Estimation Algorithm For Calibrating Solid-State Strapdown Magnetometers
Magnetometer Heading Non-Linear Estimation
2015/6/29
This paper presents a new algorithm for calibrating modern, solid-state strapdown magnetometers. The traditional method for cali brating these sensors is a cumbersome procedure called “swinging” which...
LAAS Ground Facility Design Improvements to Meet Proposed Requirements for Category II/III Operations
LAAS Ground Facility Design Improvements Category II/III Operations
2015/6/26
Stanford University has developed a Local Area Augmentation System (LAAS) ground facility prototype known as the Integrity Monitor Testbed (IMT) to demonstrate the feasibility of LAAS precision approa...
Assessment of Ionospheric Impact on LAAS Using WAAS Supertruth Data
Ionospheric Impact LAAS WAAS Supertruth Data
2015/6/26
In order to reflect the impact of spatial ionospheric gradients on Local Area Augmentation System (LAAS) users, the LAAS Ground Facility (LGF) broadcasts a conservative standard deviation (σvert_iono_...
针对高超声速飞行器参数不确定弹性体模型，提出了一种基于非线性干扰观测器的自适应反演控制器设计方法。将曲线拟合模型表示为严格反馈形式，采用反演方法设计控制器。采用动态面方法获取虚拟控制量的导数，避免了传统反演控制“微分项膨胀”问题。为了增强控制器的鲁棒性，基于二阶跟踪-微分器设计了一种新型非线性干扰观测器，以此对模型不确定项进行自适应估计和补偿。仿真结果表明，控制器对模型不确定性和气动弹性影响具有强...
合成孔径雷达(SAR)图像的低信噪比和乘性相干斑噪声给SAR图像的边缘检测带来了极大的困难.通过引入广义高斯(GG)分布作为局部均值功率的先验分布模型,给出了局部均值功率在最大后验概率(MAP)意义下的最优估计,进而提出一种新的SAR图像边缘比率检测算子.利用以梅林变换为基础的对数累积量(MoLC)方法估计GG分布的参数,在此基础上给出一种局部均值功率MAP估计和GG分布参数估计的联合迭代求解方法...
基于CAN总线的星上交互式仿真框架
CAN 总线 仿真 框架 卫星
2010/12/6
为解决星上仿真系统的接口规范以及仿真交互协调的问题，建立基于CAN 总线框架的交互式星上仿真系 统。依照各组成部分进行建模，形成多个仿真成员，在各成员驱动程序接口之上进行二次封装，形成统一接口，再 配合CAN 总线仿真框架，构建星上仿真系统。设计并实现了各仿真成员之间统一的通信接口，规范了仿真流程框架， 构成了各仿真成员相互交互、协调运行的基础。实验结果证明，该仿真框架传输效率高、运行稳定、适应性...
再入航天器解体产生的空间碎片在高速气体加热作用下发生烧蚀,残存碎片对地面造成很大威胁。开发空间碎片再入烧蚀预测与地面安全评估软件系统(DRAPS),建立碎片三自由度(3DOF)弹道模型,在连续流、自由分子流和过渡区流分别采用牛顿流模型、无碰撞分子动理论和桥函数方法进行碎片气动力/气动热预测,利用零维或一维热传导模型模拟材料烧蚀过程,在高度准则基础上建立考虑烧蚀效应的多种解体模型,形成航天器/碎片再...
多雷达信号融合通过对多视角和多频带雷达信号进行相干融合,可以提高图像的距离和方位向分辨率。为了克服基于谱估计的多雷达信号融合方法稳健性严重依赖于散射点个数估计精度和二维极点配对精度的问题,在深入研究逆合成孔径雷达(ISAR)信号的基础上,构造了多雷达信号二维融合的线性表示模型,将融合处理转化为一个信号表示问题;充分挖掘ISAR信号在傅里叶域的稀疏特性,提出了基于信号稀疏表示的多雷达信号融合方法。研...
Active TLCGD control of plane asymmetric buildings under earthquake excitation
Asymmetric building Earthquake excitation Active control LQR algorithm
2010/4/19
The sealed, tuned liquid column gas damper (TLCGD) with gas-spring effect extends the frequency range of application and efficiently increases the modal structural damping. Active tuned liquid column ...