查询词典 astronomical theodolite

The measurement accuracy of the photoelectric theodolite is decided based on measurement requirement of the ballistic trajectory. Two simple equations were derived mathematically, one expression for positioning error of the ballistic trajectory, angle error of the photoelectric theodolite, ranging error, target slant range and height when one instrument is used, another expression for positioning error of the ballistic trajectory, angel error of the photoelectric theodolite, target slant range and intersection angle when two symmetrical intersection instruments are used.

通过数学解析的方法，推导建立了2个简洁的公式：1）单站定位体制下弹道点位精度和光电经纬仪测角、测距精度以及目标斜距、高角之间的数学表达式；2）对称交会测量体制下弹道点位精度和光电经纬仪测角精度以及目标斜距、交会角之间的数学表达式。

The electric control system of theodolite and tracking sensors' characteristics is investigated deep. Based on these characteristics and data fusion structure theory, the data fusion structure in the theodolite system is advanced. The theory method of multi-sensor data fusion is studied deep. And more, the estimate theory of data fusion is applied concretely to the theodolite with the aim of prognosticating the object state.

本文首次提出了将多传感器数据融合技术应用到光电经纬仪系统中，在深入研究光电经纬仪电控系统和跟踪传感器特性基础上，并结合数据融合结构理论，提出了光电经纬仪跟踪测量系统数据融合结构；深入研究了多传感器数据融合的理论方法，并实验研究了数据融合的估计理论在光电经纬仪中的应用，目的是实现对目标状态的预测。

Modern and practical astronomy was developed in the 18th century, and successively from the theoretical and practical solution to the Sino-satellite instrument measuring time, too Seoul Scott multi-satellite measurements such as latitude, as well as simultaneous determination of longitude and latitude Supreme Court means the emergence of theodolite, contour instrument, the satellite instrument, zenith instrument, photographic zenith tube, sextant and other useful astronomical instruments, the most commonly used is the optical theodolite .20 century, all-round practical field of astronomy 60 years after the emergence of new technologies, such as satellite Dhoop Le observation and satellite laser ranging, not only the accuracy of more than optical observations, but also greatly improved operating speed, and can provide direct point of geocentric coordinates of the ground.

现代实用天文学是18世纪发展起来的，先后从理论和实践上解决了中星仪测时、太尔各特测纬以及多星等高法同时测定经度和纬度的方法，出现了经纬仪、等高仪、中星仪、天顶仪、照相天顶筒、六分仪等实用天文学仪器，最常用的是光学全能经纬仪。20世纪60年代以后实用天文学领域出现了崭新的技术，如人造卫星多普勒观测和人卫激光测距，不但精度超过光学观测，而且作业速度大大提高，并能直接提供地面点的地心坐标。

As the astronomical constants between ephemeris calculations, determine the astronomical almanac astronomical constants is also an important part.

由于天文常数关系历表计算，所以确定天文常数也是历书天文学的重要内容。

The theory of accretion disks are important for many astrophysical phenomena, including Quasars, active galatic nucleic, X-ray binary stars, and young stellar objects. The most important branch of accretion djsk theory is the stability properties of djsks. It is widely considered that the luminosity variations of various astronomical objects are associated with the instability of accretion disk. The viscosity plays an important role in the accretion disk theory, and magnetic field exists commonly in astronomical phenomena. A more realistic analysis of the stabihty of the accretion disk should include both the radjal and azimuthal perturbations because of the strong shear of viscous flow.In this paper, according to the luminosity Variations of Various astronomical objects, we study the radial-azimuthal instability of an isothermal with magnetic field. We find that the radial and azimuthal fields B〓,B〓 are mainly responsible for enhancing the instability of the magneto-acoustic modes and non-axisymmetric modes,and that pulsational oscillations are larger in the radial than in the Z direction. The model may be useful in explaining the periodic light variation of FU orionis and. T Tauri stars.

在许多天体物理现象中，例如活动星系核，X-射线双星和年青的恒星理论中，吸积盘理论起着重要的作用，而吸积盘理论中的一个重要分支是吸积盘的不稳定性理论，普遍认为活动天体的周期，准周期光变现象与吸积盘的不稳定性有关，在吸积盘理论中，粘滞起着重要的作用，而磁场是天体物理中普遍存在的现象，对于几何薄吸积盘不稳定性分析，由于强剪切流的缘故，应该包括径向和环向扰动两个方面，本文结合天体物理中的各种周期，准周期光变现象，研究了含磁场的等温薄吸积盘的径向-环向振荡不稳定性，结果表明：磁场的径向和环向分量对磁声模和非轴对称模的不稳定性的增加起着主要的作用，且径向振荡大于轴向振荡，所得结果有利于解释FU Orionis和T Tauri Stars的周期光变现象。

The paper intorduces analysis and calculation for the uncertainty ofmeasutement on the basis of requirement of "'93 Intermational quidebook", according toclass jz theodolite standing disk index for the JJ G414-94 《 photology theodolite》 verification and calibration, in the automatic compensation.

介绍了按照JJG414—94《光学经纬仪》检定、校准J2级经纬仪竖盘指标自动补偿误差时，依据"'93国际指南"要求，对其测量不确定度进行的分析、计算。

The study demonstrates that there are four ways to expand the bandwidth of servo control system of the electro-optical theodolite: 1 Improving the free vibrancy natural frequency of optical-electronic theodolite; 2 To compensate the structural syntony ; 3 Using electric current feedback; 4 Using acceleration and velocity feedback.

研究表明，提高光电经纬仪伺服控制系统带寛有4个途径：1）增大光电经纬仪固有频率；2）对结构谐振进行补偿；3）使用电流反馈；4）使用加速度和速度反馈等。

Theodolite tracking of the aircraft structure and a direct impact on the accuracy of the theodolite and stability.

而经纬仪跟踪架的结构形式又直接影响着经纬仪的精度和稳定性。

The dynamic structural property of an electro-optical theodolite is an important basis for designing electro-optical theodolite.

光电经纬仪的结构动态特性是设计光电经纬仪的重要依据。

The mathematic model of optical-electronic theodolite control target is set up.The control strategy of optical-electronic theodolite is discussed.

在深入分析光电经纬仪动力学特性的基础上，讨论了光电经纬仪的控制策略。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。