系统误差

Four sub-channels are used in the forward equalizer and the coefficients of the equalizer are adjusted by the error of constant modulus algorithm. The advantages of FSE and DFE are integrated. The ideal equalization can be obtained as long as the length of the equalizer equal to or bigger than that of the channel, and the algorithm has the characteristics of faster convergence and smaller mean square error.

该算法前馈滤波器采用4路子信道系统模型，用常数模误差函数对均衡器权系数进行调整，综合了分数间隔均衡器和判决反馈均衡器的优点，均衡器权长只要大于或等于信道长度就能完全均衡信道，该算法收敛速度比波特间隔判决反馈盲均衡算法与T/4分数间隔盲均衡算法(T/4FSE)快、均方误差比BSDFE与T/4FSE小，且计算量不变，有利于信息的实时恢复。

With the evaluation, each group measuring value is considered as a single subsystem, and the minmax-difference, mean difference and the mean square value of each group are calculated. Then, the ratio of the mean difference to the measurement mean value is defined as the system-relatively error of subsystem and the ratio of the minmax difference to the measurement mean value is defined as the accidence-relatively error of the subsystem.

以每组为一个子系统，分别计算出每组的极差、平均差和标准差，然后定义平均差和测量平均值的比值为子系统的系统相对误差，定义极差和测量平均值的比值为子系统的偶然相对误差。

Integrated SINS/GPS navigation system, which plays key roles in the navigation field, is also studied. The design principles and implementation problems are investigated and discussed.

陀螺和加速度计的误差，圆锥效应的补偿剩余误差对长时间工作的SINS系统的性能仍有很大的影响。

According to the observation experiment at the Jiufeng station where there is smaller environment noise, the conclusions are drawn as follows.In the normal atmosphere, the observed value is about 500×10-5ms-2, which is greater than theoretical value about 30×10-5ms-2, and if in the low vacuum, the observational error about 2.3×10-5ms-2 is generated. The vacuum maintaining system in falling room can not work normally, which will yield 0.1~4.1×10-5ms-2 error to the gravimetric observation. In the case of that the measurement is in the stable geological conditions and the smaller environment noise, the action of vibration isolating spring is not obvious, but it yields greater effects on measurement accuracy.

通过在环境干扰较小的九峰站观测实验，得到如下结论：在正常大气压状态下所观测到的空气阻力影响约500×10-5ms-2，比理论估算值大近30×10-5ms-2，若在低真空状态测量空气阻力也将产生2.3×10-5ms-2观测误差；落体室真空度维持系统工作不正常，空气阻力也将对重力观测造成0.1~4.1×10-5ms-2的观测误差；在地质条件比较稳定，环境震动干扰较小的基墩上测量，隔震弹簧的作用对观测结果影响不明显，但对测量精度影响较大。

To some problems of it, the design train of thought that only A/D, subdivision and counting circuit compose open-loop control system is proposed in this paper. It thoroughly renovates traditional design train of thought; Integrated subdivision circuit on the basis of AD2S90 and QA740210 is proposed and designed; Digital readout system has simple PLC function and realizes communication between it and PC; Advanced LCD technology is adopted; Using software error amendment realize dynamic compensation for error; Intelligence digital readout system by inductosyn having high accuracy and multifunction is designed.

针对目前感应同步器数显表存在的一些问题，本论文研究中提出了仅有A/D转换、细分和计数电路组成的开环控制系统的设计思路，彻底革新了传统的设计思路；提出并设计了基于AD2S90和QA740210的集成化细分电路；使数显表具有了简易PLC的功能，实现了上位机PC和数显表之间的通讯；采用了先进的LCD液晶显示技术；利用软件误差修正方法可以实现对误差的动态补偿；开发设计了精度高、功能多的智能数字化感应同步器数显表。

Because of the target's motion, the solutions to path planning for space robot become complex, it is rather difficult to find a close loop control method to guarantee surely capturing a moving target.

该方法是一种开环控制方法，但不产生累计误差，因此能保证系统的误差要求。

The three-axis rotating platform calibration formulas of scale factor error and mounting error of laser gyro in SAHMS have been deduced.

推导了基于三轴转台的用于标定系统中激光陀螺刻度因子误差和安装误差的公式。

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摘 要：由于加工切削效率轴达到实习心得振兴数控机床实习心得发布装备制造业调整废气涡轮增压器常见故障及排除换刀高速切削技术的优势在冲裁模中废旧滚动轴承内外环设备故障诊断常用简易方法名词简介金属材料工艺性能铝材质量因素净化水处理技术空白亚微米分离技术回转拉削基本原理定位安装的基本原则特征技术产生的背景发动机曲轴凸轮轴的高速磨削加工五轴机实施中数控机床实习心得涌现诊断轴承保持架诊断系统预防措施10例模具钢淬火裂纹分析弹性变形误差δφ的分析维护及保养气动工具棱体成形车刀加工圆锥面工件时产生的形状误差 ina 圆柱滑动套 zgb200x五轴机x180 ina 圆柱滑动套数控机床实习心得180x200x180 ina 圆柱滑动套 zgb160x机床实习心得x150 ina 圆柱滑动套 zgb数控机床实习心得x155x150 ina 圆柱滑动套 zgb120x135x120 ina 圆柱滑动套 zgb110x125x100 ina 圆柱滑动套 zgb100x115x100 ina 圆柱滑动套 zgb90x105x80 ina 圆柱滑动套 zgb80x实习心得x80 ina 圆柱滑动套 zgb70x80x70 数控机床的主轴机床信息交流网结构一般采用交流电机和伺服电机，采用变频器或以消除直流电机电刷维护和高速限制，通过带传动把运动传给主轴，进而使主轴达到一定的转速来实现无级调速，同时利用变频器的速度一致信号来确认电动机达到了指令速度后，再进刀切削加工，从而提高了效率

The early model has a circular error probable of 300~600m, but various improvements on the guidance system has increased the accuracy of the missile to CEP

早期型拥有300~600米的圆概率误差，但是多方面改进制导系统把导弹的精度提高到圆概率误差150~500米。

The result shows that the error in sample and quantization causes coupling error in the output of attitude in SINS.

结果表明，由于采样和量化过程中的误差，使惯导系统输出的姿态角出现了耦合误差，并提出了对采样信号进行预处理即设计滤波函数以减小采样信号失真的观点。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。