Arithmetic Analysis of Geocentric Vector Based on Earth Sensor for Spheral Model and Oblate Model;
基于圆球与椭球的地球敏感器地心矢量算法分析
The accuracy of the measurements of the geocentric vector plays a key role in satellite navigation,but it is affected by the earth oblateness.
卫星利用紫外敏感器和星敏感器进行自主导航的方法中地心矢量的测量精度是影响导航精度的重要因素之一,而地心矢量的测量又受到地球扁率的影响。
The scanning infrared sensor is used to measure the geocentric vector.
圆锥扫描式红外地球敏感器常用于测算地心矢量,而地球扁率影响地心矢量精度。
In the course of the transform from spherical surface coordinates of radar s station to right-angle coordinates of the command center fulfilled by the earth-centered coordinate, when the rotation of the earth and the factor of topography and the function of the gravity are considered.
在利用地心坐标完成从雷达站球面坐标到指挥中心直角坐标的转换中,当考虑到地球自转、地形因素及重力作用时,所采用的地球模型与地球实际水准面并不重合,坐标系的坐标轴与实际之间存在着垂线偏差。
In order to evaluate the real accuracy of the geocentric coordinates determined by GPS and VLBI,two kinds of geocentric coordinates are compared located on the same site.
在并置站上对GPS和VLBI两种空间技术测定的地心坐标进行了比较,经过历元统一、偏心改正和七个转换参数之后,得到了两种空间技术地心坐标之间的不符值,其可以认为是这两种空间技术的真正实现精度,这两种地心坐标三个坐标轴方向分量的外符精度都在1 cm之内,试验说明了GPS和VLBI确定的地心坐标已达到毫米级。
In order to evaluate the real accuracy of the geocentric coordinates determined by GPS and VLBI,we used their data located on the same site.
为了评价GPS与VLBI这两种空间技术测定的地心坐标的真正实现精度,选择使用它们的并置站坐标数据,在进行了历元改正和偏心改正后,计算了这两种技术实现的参考架的转换参数,并分析了它们坐标不符值的中误差,得出GPS与VLBI这两种技术实现的参考架的外符合精度在1cm之内,表明了GPS与VLBI这两种技术测定的地心坐标精度已经达到毫米量级。