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飞机数据
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  airplane data
     Experiments based on the ISAR radar airplane data demonstrate an improvement of the proposed method on classification performance .
     基于航天二院的ISAR实验雷达实测飞机数据的实验表明该方法是一种行之有效的识别方法。
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     NET Web Services . The methods for building and implementing Web Services are stated especially with an actual example of Selecting airplane data in this paper.
     NET平台的Web服务在数据库中的应用,通过飞机数据查询Web服务的实例,重点说明了实现和使用Web服务的方法和步骤。
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     Experimental results based on the ISAR radar airplane data demonstrate the improved performance with the proposed method.
     基于ISAR雷达实测飞机数据的实验结果证明了该方法的有效性。
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  “飞机数据”译为未确定词的双语例句
     Secondly, various kinds of data of the aircraft are managed and pretreated.
     论文的第二部分进行了对各种飞机数据的管理和数据的预处理工作。
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     Experimental results of the proposed method for real-life ISAR data target recognition together with a comparison to the RBF and the MCC-TMM method,indicate effectiveness and efficiency of the proposed method.
     对ISAR实测飞机数据的分类实验及与模板匹配法和RBF识别方法的比较,获得了良好的识别结果,表明了该方法的可行性和有效性。
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     This paper discusses the whole frame and realization of key technology deeply focuses on the FDMRS according to major programs, namely fifteen pre-research of air force.
     本文结合空装“十五”预研项目—“飞机数据管理记录技术”子专题,对新一代战斗机的飞机数据管理记录技术展开深入研究,重点探讨了飞机数据管理记录系统的总体框架设计及其关键技术的实现。
短句来源
     Incorporated with the tenth-five project of Air Force -The Intelligent Cabin Show Controlling and Flight Data Management Record Technology, and key construction project "Information Virtual Visualization Technical Research ", taking advantage of virtual reality workstation and stereo projection system, we put further research on the modeling and real-time rendering technology of Virtual Cockpit scene.
     本论文结合空装“十五”预研项目“智能化座舱显示控制及飞机数据管理记录技术”和重点学科“十五”建设项目“信息虚拟可视化技术研究”,利用所购置的虚拟现实工作站和立体投影系统,对虚拟座舱的视景生成及实时显示技术开展深入研究,实现了虚拟座舱系统的方案论证及其关键技术研究。
短句来源
     Finally ,the outdoor measured ISAR data of aircrafts are processed and the imaging results are compared with each other.
     最后利用雷达外场实测飞机数据比较了它们的成像结果。
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  相似匹配句对
     DATA
     数据
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     DATA & INFORMATION
     数据
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     The Design of an Aircraft Navigation Data Simulator System
     飞机导航数据仿真系统设计
短句来源
     Restoration of Vibration Clipped Data of a Plane
     飞机振动测试数据的削波恢复
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     Cable Arrangement in an Aircraft
     飞机电缆敷设
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  aircraft data
An experiment was conducted at the Maricopa Agricultural Center, Arizona, to test the feasibility of using satellite and aircraft data for crop monitoring and irrigation management.
      
On the other hand, a preliminary evaluation of aircraft data showed some potential for application to irrigation scheduling.
      
Using proper priors, the Bayes estimates of the parameters of the model are derived and the results are applied on the aircraft data of Proschan (1963,Technometrics,5, 375-383).
      
High intercorrelation between water quality parameters meant that only the suspended sediment information could be extracted from the multispectral aircraft data.
      
Comparison with independently collected research aircraft data over the Mediterranean Sea also shows how the scheme can provide improved analysis even over data sparse areas.
      
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  airplane data
Time correlation to relate the strain gage data to the airplane data.
      
Their scale is much too small to be directly observed even with airplane data.
      


An efficient maximum likelihood method for the estimation of instrumentation errors for flight is presented. In order to get high accuracy of bias estimation and to decrease the effects of measurement noises, the least-squares and shifted Chebyshev series method are applied to smoothing the measurements of roll rate, yaw rate, pitch rate, and accelerations. The methods for determining sensitivity matrix and initial values of parameters are developed and U-D factorization is devoted to computing the"ill-conditioned"matrix...

An efficient maximum likelihood method for the estimation of instrumentation errors for flight is presented. In order to get high accuracy of bias estimation and to decrease the effects of measurement noises, the least-squares and shifted Chebyshev series method are applied to smoothing the measurements of roll rate, yaw rate, pitch rate, and accelerations. The methods for determining sensitivity matrix and initial values of parameters are developed and U-D factorization is devoted to computing the"ill-conditioned"matrix of parameter covariance. Simulation and actual application to two kinds of aircraft show that the method presented in this paper can give accurate estimation results of instrumentation errors of flight test system and is more efficient than the ordinary ones.

本文提出了一种有效的飞行仪器偏差估计的极大似然方法。为了提高对偏差估计的精度,采用了最小二乘方法对角速率,过载的测量量进行平滑,以减小系统噪声对估计精度的影响;并给出了灵敏度矩阵和初值的确定方法以保证算法的收敛速度。通过数字仿真和对我国几种不同类型飞机的飞机数据实际计算表明,提出的方法能够较准确地辨识出测量仪器的偏差,比普通极大似然法更有效。

The optimal reentry trajectory is designed with the help of Drag Reference Profile (DRP). The DRP is first selected in the reentry flight corridor formed by fundamental contraints, such as, maximal dynamic pressure, maximal heating rate, maximal acceleration overload and maximal surface temperature limits. Then the DRP is adjusted to satisfy the required footprint and the terminal guidance demands. Finally, the DRP is determined by optimization of minimal total heat load input with satisfication of above two...

The optimal reentry trajectory is designed with the help of Drag Reference Profile (DRP). The DRP is first selected in the reentry flight corridor formed by fundamental contraints, such as, maximal dynamic pressure, maximal heating rate, maximal acceleration overload and maximal surface temperature limits. Then the DRP is adjusted to satisfy the required footprint and the terminal guidance demands. Finally, the DRP is determined by optimization of minimal total heat load input with satisfication of above two considerations. The guidance law for the Shuttle reentry is given and some numerical calculations using the data of American Space Shuttle are made to verify the method. The results are satisfied.

本文研究航天飞机受过载、动压及加热约束情况下,总加热量最小的最优再入轨迹与制导问题。文中给出了确定阻力参考型、再入飞行走廊的方法与模型,建立了相应的制导律,以总加热量最小为性能指标,通过适当选取阻力参考型的变化,将再入轨迹的优化转换成参数的优化问题。并以美国航天飞机数据为例进行了模拟计算,得到了满意的结果。

In this paper a special design' method for optimal reentry trajectory and guidance of manned spacecraft is presented. This method has the advantage over traditional theoretical optimization. It should be emphasized that with this method the state parameters vary smoothly even during the last stage of the reentry trajectory. The reentry trajectory guided by means of Drag Reference Profile (DRP) is designed through parameter optimization. The flight corridor determined by system and operational constraints is...

In this paper a special design' method for optimal reentry trajectory and guidance of manned spacecraft is presented. This method has the advantage over traditional theoretical optimization. It should be emphasized that with this method the state parameters vary smoothly even during the last stage of the reentry trajectory. The reentry trajectory guided by means of Drag Reference Profile (DRP) is designed through parameter optimization. The flight corridor determined by system and operational constraints is described analytically in the plane of drag acceleration and flight velocity. The DRP must be within this corridor and is adjusted then according to the range and terminal requirements. The PID (proportional, integral and differential) guidance law is used. The optimal feedback gains are calculated through using DRP and optimization. The minimal heat input is taken as the criterion to determine the final DRP. The optimal reentry trajectory is then obtained. Finally, numerical calculations using the data of American Space Shuttle give satisfactory results.

通过确定阻力参考型将泛函极值转换成参数优化问题,利用过载、动压及加热约束确定参数的解域;再由航程要求和终端制导精度进一步缩小解域;最后以总加热量最小优化得到唯一解,采用比例-积分-微分制导律,给出了确定控制增益系数的途径,得到了一种易于工程实现的求解方法,以美国航天飞机数据为例进行了模拟计算.

 
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