系统误差

Modeling and derivation mathematics result of the use of Matlab software Simulation tests of its accuracy and error analysis, to verify the measurement of two boring bar/boring displacement signal the feasibility of the entire system, so as to the smooth development has laid a theoretical foundation.

介绍了两点法测量镗刀位置信号的方案构思，采用最小二乘法对镗杆的圆度误差和被测圆面的偏心量进行了建模计算，并对数学推导的结果利用Matlab软件进行仿真检验，对其精度和误差作了分析，验证了两点法测量镗杆／镗刀位移信号的可行性，从而为整个系统的顺利开发奠定了理论基础。

A new adaptive clock error model was put forward in order to determine the GPS error state model in GPS/ INS tightly integrated system.

针对GPS/INS深组合系统中GPS接收机误差状态模型难以确定的问题，文中提出了一种自适应的时钟误差模型。

Aiming to the problems existing in the applications of clocks received via global position systemreceiver or generated by crystal oscillator ,clock error models are respectively established.

针对全球定位系统接收机输出时钟和晶振时钟在实际应用中存在的问题，建立了相应的误差模型，在误差估计的基础上，提出了一种全新的高精度同步时钟产生方法。

The research involves constructing network error model, choosing interpolation method, computing and validating integrity index for error correction, calculating user protection level.

算法主要包括网络系统完备性算法和用户完备性算法，内容包括网络误差模型的建立、插值算法的选择、误差改正数完备性指标的计算、完备性指标的验证和用户保护水平的计算等。

Based on the analysis of the pitch error measure theorem for screw,the dynamic measure system of pitch error for lead screw constituted by single-chip microcomputer is discussed.

在分析丝杠螺距误差测量基本原理的基础上，简述了由单片微机组成的滚珠丝杠螺距误差动态测试系统，并开发了计算机辅助自动分析测控软件。

Through indoor and outdoor experiments, it was proved that the designed 3-D intelligent measurement system for field landscape and Laser leveling aided decision-making support system can work stably. The 3-D intelligent measurement system can achieve an accuracy of 2cm in attitude measurement. The measurement efficiency is two times higher than that of using measure pole of imported equipments. The measurement system developed can provide basic decision-making support for laser controlled field leveling.

通过室内和室外试验表明：自主设计研发的智能三维地形测量系统和激光平地辅助决策支持系统可以正常稳定工作；智能三维地形测量系统高程测量的误差小于2cm，工作效率同比同类设备高2倍多；激光平地辅助决策支持系统能为激光平地作业提供必要的决策支持。

As a result, the model of low-frequency aberration induced by Nd:glass amplifiers is got. On the base of low-frequency aberration model some results are achieved such as the tendency of focal spot size changing as the RMS phase gradient changes and the characteristics for the scale length. 3. The simulation model of the beamline is set up and the propagating process is analyzed in the beamline. The correlation coefficient of two wavefronts is newly used to describe and estimate the adding result of them.

建立了求空间尺度的数学模型，并运用此模型对现有的放大片透射波前进行了分析，得出了多程系统中所用钕玻璃放大片引入的低频位相误差的空间尺度分布，并据此建立了模拟放大片低频位相误差的随机位相屏模型，在此基础上对焦斑大小随位相分布RMS梯度变化而变化的规律及空间尺度的特性进行了模拟研究； 3。

Model predictions of forest biomass were successful, with the mean relative errors and the mean absolute of relative errors for needle-leaved, broad-leaved, and mixed forests being-1.47%, 2.38% and 3.56%, and 6.3%, 8.46% and 8.91%, respectively.

针叶林、阔叶林和针阔混交林的生物量遥感模型系统仿真结果的平均相对误差分别为-1.47%、2.38%和3.56%，平均相对误差绝对值分别为6.33%、8.46%和8.91%，预估效果较理想。

Because the variation of the light source and other errors related to light intensity are not so critical for the measurement in this system and some 1/4λ wave-plates affect on the other wavelengths is very little, the retardance can be measured in high accuracy and high repeatability. In principles, the system accuracy can measure any retardance, and can be used in characteristic spectrum analysis of other phase retarders.

由于此系统可忽略光强的波动及与光强有关的误差，且1/4λ波片对多波长测试误差的影响很小，故其有很高的精度和可靠性，可以测试其精度范围内的任意小延迟量，亦可对其他光学相位延迟器件进行光谱分析。

An adaptive correction method based on the measuring theory of Wheatstone bridge is proposed to reduce the effect of the multi-range measuring errors of a laser resistor trimming machine on the resistance adjusting accuracy.

为了减小激光调阻机测量系统的多档测量误差对阻值修调精度的影响，提出了一种基於有源单臂电桥测量原理自适应地校正激光调阻机多档测量误差的方法。

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。