The problem of iterative learning control in the presence of initial repositioning errors is addressed without assuming the bound on the repositioning errors to be small enough for the consideration of convergence 摘要提出系统不确定性项定常参数化和时变参数化情形下的控制器设计方法，它允许初始位置任意设置且定位误差不要求足够小。
The control effect is proved by the experiment . illuminate the principle and application of raster sensors , implement the installation and test of raster sensors , realize controlling the raster sensors with computer 对微操作系统的定位精度进行实验测试，通过对实验数据的分析，总结本系统定位误差的规律，分析造成误差的因素，制定合适的控制方案减小定位误差。
The basic theories on positioning technoledges of cell mobele communication net and compare the technologies iii . introducing how to solve the tdoa positioning algorithm and analyse the cause of the error and put forward an anti - nlos algorithm 3 )阐述了如何运用最小二乘法实现tdoa定位算法，并对造成其定位误差的因素进行了分析，在此基础上提出了抗nlos的定位算法。
The design project of the gps receiver and the design method of hardware and software are presented in detail , and the consists of gps system and the composition and the operating principle of the gps receiver are discussed in the thesis 最终使定位误差小于10米，大部分数据小于5米。本产品可通过导航仪的rs - 232口与计算机串口进行串行通讯，经串口向计算机输入相关位置坐标。
Introduce the fundamental theories of gps system , which includes the structure of gps system , positioning principles , positioning errors and coordinate transform , as well as introduce correlative theories about difference positioning system 详细介绍了gps系统的基本理论，包括gps系统的组成、基本定位原理、定位误差分析以及坐标转换，同时还介绍了差分定位系统的相关理论。
The position errors are measured by two dimension single - frequency laser interferometer , the pitch and yaw errors are tested using phase shifting interferometer with a resolution of 0 . 1nm , the linearity along motion axis is investigated by autocollimator with 0 . 01 " uncertainty 利用单频激光干涉仪测试其运动定位误差特性，相位偏移干涉法测试运动转角误差，光电自准仪测试其运动偏摆误差。
On the basement , the paper deeply researches the following problems : digital signal process , arithmetic model , error analyzing and so on . firstly , considering the single probe system ' s datum error , the paper puts forward a double probe system and modifies the datum error 第一，针对内螺纹单针测量系统存在的定位基准误差，提出了双针测量的体系结构，并利用双测针结构对定位误差进行修正。
It presents measuring principle and different working , analyses all kinds of error affecting on photoelectricity theodolite , such as track error , shafting error , orientation error , non - synchronization of time error etc , presents their error effect formulae 给出光电经纬仪的测量原理和不同的工作方式，分析了影响车载平台系统各项误差，如跟踪误差、轴系误差、定位误差等，给出影响各项误差的公式。
Moreover , the effects of the system parametric ( such as baseline length , time measure error , sound velocity fluctuate and buoys errors ) on localization accuracy are studied . the laws of the bistatic tol and bol localization algorithm are obtained 同时，通过对各种系统因素，如基线长度、系统测量误差、声速波动、浮标偏移等参数对算法性能影响的分析，得出了采用tol和bol方法进行定位时，定位误差的分布规律。
Based on analysis relationship of which the shifting direction of position datum is or not is to the distance dimensions between process datum and position datum , have researched on method define the sing about plus or minus within the calculating formula of the machine tool ' s fixture position error 由分析机床夹具定位基准的移动方向与工序基准同定位基准间的距离尺寸无关或有关两种情况，探讨确定机床夹具中的定位误差计算式中加、减符号的方法。
