移动载体稳定跟踪平台测控技术研究
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摘要
稳定跟踪平台是惯性技术应用的重要领域之一,其中天线稳定技术以其广泛的应用前景成为稳定跟踪平台研究的一大热点。稳定平台的核心问题是载体姿态测量和控制技术,传统的稳定平台以平台式或捷联式惯导系统技术为基础,使用一些机电或光电惯性敏感元件,技术复杂且造价很高,因而载体姿态测控技术也成为稳定跟踪平台发展的难点。本文以车载天线稳定跟踪系统的研制为背景,主要研究基于微机电惯性元件的天线稳定平台的姿态测控技术。课题研究的主要内容包括:天线稳定方案研究、天线伺服系统的模型辨识和控制参数整定、微机电陀螺和数字罗盘的性能测试和在天线稳定系统中的应用方法研究、卫星天线极化电平扫描和跟踪技术研究等。
     一、天线稳定方案是整个系统研制的基础,而且从根本上决定了整个系统的性能。本文针对现有的各种天线稳定方案存在的不足,提出了一种简易的使用微机电陀螺的天线稳定方案,并进行了仿真实验。
     二、采用实验建模的方法确定了天线伺服系统的二阶模型,采用改进的数字PID控制方案,通过仿真实验确定了优化的PID参数,为实际控制提供了参考。
     三、研究了微机电角速度传感器的原理,通过一系列实验确定了该传感器的性能和在天线稳定系统中的使用方法和误差补偿方案;研究了采用磁阻传感器和倾斜传感器的数字罗盘模块的原理和影响精度的因素。针对其使用的特殊要求,提出了其在天线稳定系统中的使用方法和减小误差的方案。
     四、研究了系统初始对准过程中的坐标变换算法并进行了仿真实验,针对数字罗盘本身的精度限制和安装误差对系统对星精度造成的影响,提出了基于信号电平的最大值扫描方案,使系统的初始对准精度上升到0.4°。
     五、研究了极化电平信号的特性及相应的噪声处理方案,针对两轴稳定跟踪的不足,提出了基于信号最佳电平的自动跟踪方案。
Stabilization and automatic pointing and tracking platform (FTP) is an important field among the applications of the inertial technology. And because of its broad application foreground, antenna stabilization has become a hotspot of stabilization and automatic FTP. The core of stabilization platform is the attitude measurement and control of the carrier. The traditional stabilization platform bases on
    platform or strap-down inertial system, uses mechatronics or photoelectronical inertial sensor component. The cost of this kind of platform is usually high and the technology is complex. Thus the technology of carrier attitude measurement and control also becomes the difficulty of the development of stabilization platform. With the aim of developing antenna stabilization system which carries by vehicle, this article's research
    major in the attitude measurement and control of the antenna stabilization platform, which bases on the micro-mechatronics inertial component. The main content of this article include the research on the stabilization scheme of the antenna stabilization system, the constitute of the model of the antenna serve system and the confirmation and optimization of the control parameter, the utility test of the micro-mechatronic gyro and
    digital compass, the application research of these sensors in antenna stabilization system, the research of the polarization signal scan and automatic pointing and tracking technology.
    1.The stabilization scheme of antenna stabilization is the foundation of the development the whole system, and plays important role to the utility of the whole system. Aiming at the lack of existing stabilization schemes, this paper proposes an simple schemes which uses micro-mechatronic gyros. An experiment is also carried through.
    2.This article constitutes the two-step model of the antenna serve system. The digital PID control technology is adapted and a set of optimized parameters are also brought forward here. These parameters offer reference to the real control.
    3.The principle of the micro-mechatronic angle rate sensors is discussed in this article. A series of experiment is made to test the utility of these sensors. The way to use these sensors in the antenna stabilization system and to make up of the error is proposed here. The principle of the digital compass module and the factor which affect its accuracy is also discussed in the article. Aiming at the specific using request, this paper proposes the way to reduce the error.
    4.The algorithm of the coordinate transformation during the initial pointing process of the system is developed in this article. And in view of the restrict of the accuracy of the digital compass itself and the installation error, a maximum scan scheme based on signal intensity is
    
    
    studied. By this scheme, the initial pointing precision is increased to 0.4?
    5.The characteristic of the polarization signal is studied here and the corresponding noise process method is proposed. Aiming at the limitation of two-axis stabilization and auto track, the optimized signal tracking scheme is proposed.
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