This paper analyses emphatically the position error and manufacture error of critical - angle prism the position error and aberration of object lens the position error and manufacture error of the polarization beam splitter the position error of the detector , and come out their relations 着重分析了临界角棱镜位置误差与制造误差；物镜的位置误差与像差；偏振分束棱镜的位置误差与制造误差；探测器的位置误差等对离焦误差信号的影响，并给出了理论曲线。
In image - based , also called feature - based systems , the error signal is defined in terms of image features and is directly measured in the image coordinate system . therefore , computational costs are significantly reduced and the system becomes less sensitive to abstract errors in camera calibration and system modeling 误差信号按照图像特征来定义而且直接在图像坐标空间来测量，因此可以大大降低计算量，而且系统对相机标定误差和系统建模误差不敏感。
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 quantized lp coefficients are replaced by the unquantized lp coefficients in the frequency domain expression of the feel weighted filter . the error signal has more similar envelope shape , and the hearing effect is better than before because the unquantized lp coefficients have more accuracy than quantized lp coefficients 由于未量化的线性预测系数具有更高的精度,因此,误差信号通过修正后的感觉加权滤波器以后,具有与语音信号谱更加相似的包络形状,从而更好地利用共振峰对误差的掩蔽效应,达到更佳的主观听觉效果。
Because the qam signal which is small roll - up factor has big timing - error jitter in steady state that result in big timing jitter , an expression of impulse response for digital prefilter is deduced and a kind of sub - optimum design method for digital prefilter is proposed in this paper 针对匹配滤波器滚降因子较小的qam信号的稳态定时误差信号抖动较大，而造成较大定时抖动的情况。推导了一种用于减少定时抖动数字预滤波器的冲激响应表达式，并且提出一种数字预滤波器的设计方法，设计了一种优化数字预滤波器。
A micromachined vibratory rate gyroscope which can work at atmospheric pressure is presented in this paper , but a main problem of which was discovered through fea analysis : the mechanical coupling error can easily arise if the mass and the supporting beams are not completely symmetrical as a result of fabrication error during silicon micromaching 仿真结果表明,在驱动力与驱动轴有微小偏差的情况下,机械耦合引起的误差信号完全把角速度信号湮没。这说明机械耦合误差的存在大大降低了微机械陀螺的精度。
