采用CARMH模型的广义最小方差自校正控制器全局收敛性

在一种新的预测模型的基础上，建立了一般的广义最小方差自校正控制器，并证明了当辨识算法采用随机逼近法时的这种自适应算法的全局收敛性，从而为这种新型模型的进一步应用提供了一定的理论依据。     

UWBR和HPMW一体化设计探讨

简述了美国雷达武器化的研究现状；介绍了超宽带雷达（UWBR）和高功率微波武器（HPMW）的组成、基本原理；结合国内外现有技术成果，分析了UWBR和HPMW一体化设计的可行性；参照数字阵列雷达，提出了一种UWBR和HPMW一体化概念设计结构图，并重点讨论了一体化设计的难点及关键技术。     

开口风洞声阵列测量的剪切层修正方法

开口风洞中的相位传声器阵列测量，必须进行剪切层修正才能得到真实的噪声源位置信息。在0.55m×0.40m声学风洞中开展了剪切层修正的实验研究，得到了不同风速条件下的剪切层速度剖面、声波传播延迟时间和声源定位的结果。根据实验结果，对剪切层速度剖面的Gortler理论解进行了验证，并对比分析了4种剪切层修正方法。研究结果表明:选择自相似参数σ=9，ξ₀=0.2时剪切层速度剖面测量值与理论值符合较好；剪切层厚度与轴向距离的关系为y=0.15x；马赫数Ma≤0.3、测量角θ_m在40°~140°范围内，不同剪切层修正方法对声波延迟时间计算结果的相对误差在1%以内。提出了射线追踪快速计算方法，该方法较常规射线追踪法的计算速度可提高2个数量级，从而使其适用于声阵列在线测量。     

战术导弹的一种自校正控制

本文探讨自校正控制理论在战术导弹控制中的应用。采用一种渐近的最小方差自校正控制方案设计导弹自动驾驶仪回路。该方案通过设计自校正控制器的极点和可调增益,使控制器稳定,并能兼顾闭环系统的动态特性,也可使输出方差趋于最小。在两种参考输入信号情况下进行仿真,结果表明,与经典控制情况相比,该方案具有较强的抑制干扰能力,能克服参数变化对系统控制性能的影响,提高了系统的跟踪性能。     

ATC模拟系统中存贮系统的容错技术

ATC 模拟系统是一个比较复杂的,实时性很强的控制系统,要求整个系统的可靠性很高。而对于一个系统来讲,其中央存贮系统是保证整个系统正常工作的关键部件之一。在我们引进的系统中,它的容错技术在设计上有其独到之处。本文就其存贮系统的结构、容错技术及支持电路这三部分予以说明和论述,仅供同行参考。     

Singular formalism and admissible control of spacecraft with rotating flexible solar array

This paper is concerned with the attitude control of a three-axis-stabilized spacecraft which consists of a central rigid body and a flexible sun-tracking solar array driven by a solar array drive assembly. Based on the linearization of the dynamics of the spacecraft and the modal identi- ties about the flexible and rigid coupling matrices, the spacecraft attitude dynamics is reduced to a formally singular system with periodically varying parameters, which is quite different from a space- craft with fixed appendages. In the framework of the singular control theory, the regularity and impulse-freeness of the singular system is analyzed and then admissible attitude controllers are designed by Lyapunov＇s method. To improve the robustness against system uncertainties, an H∞ optimal control is designed by optimizing the H∞ norm of the system transfer function matrix. Comparative numerical experiments are performed to verify the theoretical results.     

Accuracy enhancement of the spherical actuator with a two-level geometric calibration method

This paper presents a two-level geometric calibration method for the permanent magnet （PM） spherical actuator to improve its motion control accuracy. The proposed actuator is com- posed of a stator with circumferential coils and a rotor with multiple PM poles. Due to the assembly and fabrication errors, the real geometric parameters of the actuator will deviate from their design values. Hence, the identification of such errors is critical for the motion control tasks. A two-level geometric calibration approach is proposed to identify such errors. In the first level, the calibration model is formulated based on the differential form of the kinematic equation, which is to identify the geometric errors in the spherical joint. In the second level, the calibration model is formulated based on the differential form of torque formula, which is to calibrate the geometric parameters of the magnetization axes of PM poles and coils axes. To demonstrate the robustness and availability of the calibration algorithm, simulations are conducted. The results have shown that the proposed two-level calibration method can effectively compensate the geometric parameter errors and improve the positioning accuracy of the spherical actuator.     

多波段拉曼-荧光激光雷达系统可用于雾霾探测

正近日,兰州大学教授黄建平带领科研团队研制出我国首个多波段拉曼-荧光激光雷达系统。该系统不仅可用于大气雾霾探测的研究及预警,还可用于卫星数据校正、气象观测等领域。"多波段拉曼-荧光激光雷达系统用高功率激光器向天空同时发射三束激光,也就是三个波段。紫外激光与大气颗粒物作用之后,就会释放出荧光,利用大口径的望远镜接收被大气反射回来的信号,共有38个波段。黄建平     

DS—SS系统数字终端的频率校正方法

本文介绍一种适用于DS—SS系统数字终端的频率校正方法,对DSP的算法进行了深入地研究,并分析了系统的性能。     

新世纪航空机载设备制造技术展望

介绍了国内外航空机载设备制造技术的现状 ,展望了 2 1世纪航空机载设备制造技术的发展趋势 ,提出了发展我国航空机载设备制造技术的设想。