天顶距

天顶距在三维平差中的应用

The Application of the Ellipsoidal Zenith in the 3D - adjustment

星像抖动随不同天顶距的变化

On the variances of the star images tremble versus different zenith distance

OPL棱镜等高仪天顶距改正的温度特性的研究&特性曲线研究方法的讨论

The temperature characteristic for the zenith distance correction of the DANJON astrolabe & the discussion of a method for studying the characteristic curve

等高圈天顶距的稳定，对等高星表的△αδ系统差的影响不明显。

Systematic error influenced by stability of zenith of altitude circle is not distinct .

竖直度盘偏心误差对天顶距观测结果的影响及其改正

The effect of the eccentric error of vertical circle on zenith distance observations and its correction

自动放置天顶距

Automatical setting of zenith distance

文中给出了三维测量中边长与天顶距变化同应变与倾斜的关系式。

Equations for strains and tilts obtained from changes in line length and zenith distance are given .

星光跟踪仪提供天顶距的测量数据，红外高度测量仪提供航天器的高度数据。

The measurements of the spacecraft star navigation system are provided by star tracker and infrared accelerometer .

本文从有效波长的角度，讨论了光谱型效应的复杂性，不同的仪器采用不同的接受器、以及在不同的天顶距观测，都有不同的光谱型差。

This paper , from the Point of effective wave length , has discussed the complexity of the spectral type effect .

卯酉方向天顶距的星径曲率改正以及子午方向天顶距的星径曲率改正。

They are the curvature corrections for recording time at the determined zenith distances when a star passes the prime vertical and the meridian circle .

在此基础上，导出了一系列严密计算公式，精确计算在不同天顶距条件下的弯曲改正。

According to the above consideration , a series of strict formulae to calculate the curvature correction under the condition of different zenith distances are derived .

本文给出了一种研究星像抖动随天顶距变化的观测和归算方法&分组观测与分组二元线性回归方法。

A method in which , observations and regression analysis are divided into groups , is presented of studying the variations in stellar image motion associated with the changes in the distance from the zenith .

环形金属罐的测量采用光切法，通过分析中心距、水平夹角、左右切点天顶距等参数，计算球形金属罐容量测量结果的不确定度。

Spherical metal tank is measured by light tangent method , and the uncertainty of measurement results is calculated by analysing the centre distance , horizontal angle and left and right tangent distance to the top etc.

证明了文献[1]提出的用经球气差改正的天顶距计算平距方法的正确性，并就文献[1]的改进与完善提出了有益的建议。

The method for calculating horizontal distance using zenith distance corrected by earth curvature and atmospheric refraction in article [ 1 ] is proved rightly , and some suggestions to perfect article [ 1 ] are also given .

本文基于计算重力固体潮理论值的天顶距法，通过严格的理论推导，给出了计算重力固体潮理论值的导数的封闭公式。

The zenithal distance expression based on theoretical value of gravity earth . tide , the precise formula for calculating derivative of theoretical value on gravity earth tide is induced by strict mathematical method , in this paper .

简述了测定瞬时大气折射值以及建立电磁波折射延迟改正模型时，对视天顶距测定值的精度要求和消除系统误差的必要性；

The demands on accuracy of measured apparent zenith distances and the necessity of elimination of systematic errors during the time of determining the astronomical refraction and building the radio wave refractive delay corrective model are described concisely .

研究结果表明，仪器定向误差的高次项影响在可观测天顶距范围内都是比较大的，必须在结果中加以改正。

The results show that the effect of the higher power terms of the directional error of the instrument is comparatively great within the observable range of the zenith distance , and the correction for the results must be made .

本文首先指出文献[1]存在的问题，推导了用高差和观测天顶距计算平距的公式，并指出这些平距皆是测边两端平均高程面上的边长；

The question in article [ 1 ] is first proposed in this paper Formulas for calculating horizontal distance on the mean height surface between two ends of side length directly using the difference of elevation or the measured zenith distance are derived .

根据低纬子午环绝对测定的要求，在原来的测微器方案〔1〕的基础上，针对斜狭缝用于卯酉方向测定天顶距时所存在的问题，对原来的视栅形式作了进一步改进。

According to the demand of the absolute measurement by the Low-latitude meridian circle , for problems of the measurement of the zenith distance in the direction of the prime vertical using the slant silts , the previous grating form is improved based on the former micrometer scheme .

不同海拔高度时雷达视距分析三角高程测量中天顶和斜距的计算

Analysis on Radar Apparent Distance by Different Elevation Altitude THE COMPUTATION OF THE ZENITH DISTANCE AND SLOPE DISTANCE IN TRIGONOMETRICAL LEVELING

三角高程测量中天顶和斜距的计算斜距垂直角在竖直面上的归心改正

THE COMPUTATION OF THE ZENITH DISTANCE AND SLOPE DISTANCE IN TRIGONOMETRICAL LEVELING Reduction to Mark Center of Slope Distance and Vertical Angle on Vertical Plane