中天法

通过应用WILDGAK-1陀螺经纬仪进行逆转点法、中天法及时差法的定向实验，论述了3种定向方法的理论精度，并和实际定向精度进行了比较。

This paper describes the orientation experiments of Reversal Point Method , Transit Method and time Difference Method by means of Wild GAK-1 gyro-theodolite , and the theoretical precisions of these three methods and the practical orientation precisions are compared .

实验表明，半周期中天法应用于JT-15陀螺仪的初寻北精度可以达到±8′，而且初寻北效率提高了一倍。

Experiments show that semi-period transit method is adopted in the coarse north-seeking of JT-15 gyroscope ,± 8'north-seeking precision can be achieved and efficiency of coarse north-seeking is one time faster than period transit method .

用中天法进行矿井定向的一些问题

Some problems existed in mine orientation by using transit method

半周期中天法在初寻北中的应用研究

Application Research of Semi-Period Transit Method on Coarse North-Seeking

陀螺定向中天法容许的时间差

Permissible Time Difference of Gyroscopic Orientation Culmination Method

陀螺经纬仪中天法定向的研究

Research into the Transit Method of Gyrotheodolite Orientation

根据试验和实际定向资料，分析确定了中天法测量的精度；

According to the data of experimental and field orientation , the measurement accuracy of the transit method is analyzed and determined in this paper .

由陀螺仪寻北中天法的基本原理出发，提出了一种固定照准部的初寻北半周期中天法。

Based on the principle of period transit method , semi-period transit method of collimation is proposed to improve the north-seeking speed and the automatic degree .

认为，在原理上卯酉&子午交替观测法测定的纬度值是绝对的，而传统的拱极星上、下中天法不是真正绝对的；

It is suggested that in principle , the latitude values determined by means of the former method are absolute , but those determined by the latter method are not really absolute .

本文论述了中天法定向时陀螺北方向值的计算公式、理论精度、观测值及计算值的限差；

In this paper , the mathematical formula of Gyro north direction value , the theoretical precision , limiting error of observed value and calculated value and mean square error of a measurement in the orientation by using transit method are described .

本文根据矿山走向测量的精度要求，和陀螺定向逆转点法、中天法观测及数据处理模型的近似条件，分析讨论了对观测值变动范围的限制性要求。

Based on the requirements for the accuracy of mine gyroscopic orientation survey and the similar conditions data-processing models by the method of inversion points and transit method , this paper analyses and discusses the limited requirement to the changing range of observed value .