倾斜状态下数字天顶仪快速定位方法分析

Analysis of the fast positioning method of digital zenith camera in tilt state

针对数字天顶仪在精确调平状态下进行天文定位时存在耗费时间长,定位速度慢的缺点,从数字天顶仪的定位原理出发,采用方向余弦矩阵转换原理建立了倾斜角的修正模型,分析和推导了经过倾斜角修正之后的定位方法,改进了倾斜状态下数字天顶仪的切平面和球面三角形两种定位算法。实现定位时设备不经精调平,加快定位速度的目的。通过实验比较了在倾斜状态下经过改进后两种类型定位算法的定位精度。实验表明:球面三角形法的定位精度相对较高,经纬度计算精度能够达到0.5″以内。

Aiming at the problem of long time and slow positioning speed when the digital zenith camera was in precise leveling state for astronomical positioning,based on the principle of positioning the digital zenith camera,the correction model of the inclination angle was established by the direction cosine matrix transformation principle,the positioning method after the correction of the tilt angle was analyzed and deduced,and the two kinds of localization algorithms of the tangent plane and the spherical triangle of the digital zenith were improved,achieved the positioning of equipment without fine leveling,speeded up the positioning speed of the purpose.The accuracy of the two types of positioning algorithms in the tilted state was compared by experiment.Experiments show that the positioning accuracy of the spherical triangle method is relatively high,and the calculation accuracy of the latitude and longitude can reach 0.5″or less.