人造地球卫星VLBI观测的相对论时延模型

Ground-based VLBI Relativistic Time Delay Model for Satellites in High Earth Orbit

理论研究表明,VLBI观测技术将为空间目标的监测提供一种先进的、有效的技术手段,能够对高空和深空目标进行全天时、全天候的高精度监测定位。以太阳系质心参考系和非旋转地球质心参考系的坐标转换关系为基础,推导了人造地球卫星地面VLBI观测的相对论时间延迟模型,给出了一个通用的解析表达式式(14),这一公式严格解析且无误差,建议采用本公式。同时详细地讨论了公式的适用范围和各种舍掉项的量级估计,并详细给出了时间延迟理论模型的计算步骤。

VLBI observation will be one of the advanced and effective ways in monitoring and positioning objects in the air and in space owing to its high precision and being able to work in any weather conditions anytime. The ground VLBI relativistic time delay model for satellites in high earth orbit (HEO) is derived on the basis of the transform between barycentric and nonspinning geocentric coordinates. A universal analyzed expression is presented, which is recommended in processing VLBI observable of HEO satellites due to its rigorousness and errorsfree. The limitation of the formula and estimation in magnitude for neglecting items are also discussed as well as computation steps.