All of work above can work as the basic knowledge for further research for operating characteristics and simulation , the detecting principle and implementing method with sensor as the means for requirement of information about rotor position are described . next , a novel inductance method and rotor position angle estimation using fuzzy logic are studied . in this dissertation , some knowledge about error signals are detailed , at the same time , some rese arch for improving precision is also provided 通过分析有位置传感器的检测原理和实现方法，重点研究了两种无位置传感器转子位置检测方法：一是采用改进电感法(阀值电感法)的转子位置检测方法，并设计了实现方法；二是基于模糊推理规则的转子位置估算方法，针对此方法中误差信号进行分析，研究提高角度估算精度的策略和方法。
The paper set about from the reason of error produced in the course of transferring cad model to stl files . it is found out that surface - meshing process has important effect on precision which results in the emergence of errors . by combining with using typical three - dimensional paint software , the control parameter in transferring process , namely the chord height , is optimized 首先从stl转化过程中误差产生的原因着手，找到表面网格化处理这个因素会对精度产生影响，结合具有代表性的三维造型软件，对转化过程中控制参数(弦高)进行优化，得到既能满足三维实体精度要求，又不需要占用太多时间、空间等情况下的最佳弦高选用值。
Under the background of target tracking in high - density clutter , the calculation formula of the pda algorithm ' s error variance is analyzed and revised firstly , and the modified pda ( mpda ) is derived , which not only improves the tracking performance , but also makes the error variance and the real error of the algorithm match well 针对高密度杂波环境中的目标跟踪问题，首先分析和修正了pda算法中误差方差的计算公式，提出了修正的pda算法( mpda ) ，它不仅提高了跟踪性能，而且使得误差方差与算法的实际误差能够很好地匹配。
The algorithm of strapdown inertial navigation system is also discussed and then use the flight - track generator to give a simulation , since a closed loop feedback integrated navigation system is designed in this paper , and the output of the filter must feed back to the strapdown inertial navigation system , the analysis of the algorithm in strapdown inertial navigation system is important . the scheme to design the trajectory of gps and the simulation of gps constellation are then studied , the simulation of gps constellation is given from the calculation of vernal equinox base on the principle of celestial mechanics , this method of different from other methods given by other paper and is useful to the research of satellite navigation system . a new method to abstract noise modal in integrated navigation system is proved to be useful in practice , this method , which is given by use the principles of stochastic processes , statistics , time series analysis , and system identification , is suitable for the kalman filter in integrated navigation system 如航迹产生器的设计，该航迹产生器是研究组合导航问题的前提，从国外一些研究组合导航系统的文献中可以看出，设计这样一个航迹产生器是非常必要的，所以本文自行设计了这样一个系统；还讨论了捷联惯性导航系统中捷联解算的方法，并进行了仿真研究，由于在本文设计的闭环反馈式组合导航系统中，对捷联惯导系统的平台误差进行闭环控制，需要将滤波器输出的校正量反馈到捷联解算内部，所以必须对捷联解算进行深入的研究和分析，更何况捷联解算问题本身也是导航界的一个热门研究课题；另外，本文还介绍了gps轨道及其星座仿真的设计思想和方案，与以往gps轨道和星座仿真不同的是本文从天体力学中计算春分点开始，逐步进行gps轨道及其星座仿真，这样的设计方法对从事卫星导航的研究工作是有价值的；还对组合导航中误差建模方法进行了研究，综合运用随机过程、概率统计、时序分析及系统辩识等方面的理论提出了一套适合组合导航卡尔曼滤波的误差建模方法，并运用实际研究工作中的测量数据对该方法进行了验证。
In order to make the quad ( quasi - accurate detection of outliers ) more reliable , objective , practicable and convenient to be automated , the authors modified observation order index , gross error determination standard , and unit weighted root mean square ( rms ) correlated to gross error determination standard 摘要为了使拟准检定法能够更加可靠、客观、实用，便于实现自动化，对拟准检定法进行深入的理论研究和数值试验的基础上，对观测值的排序指标、粗差的判别准则、判别标准中涉及的单位权中误差等有关实施细则做了适当的改进。
Finally , in the basis of development in hardware part and software part , this thesis presents the results of the primary tests and analyzes the causes of the existing errors . also the approaches to reduce the errors are discussed , for example , improving the accuracy of the elements , raising he sampling frequency and so on 最后，本文在研制软硬件系统的基础上进行了初步测试，并给出了相关初步测试结果，通过分析测试中误差存在的原因，得出进一步减小误差的疗法：提高软件数据处理的精度、增加采样频率和选用精度更高的元器件等。
