甚长基线干涉测量天线参考点和轴线偏差监测方法探讨

Discussion on monitoring method of reference point and axis offset of VLBI antenna

高精度监测VLBI天线参考点和轴线偏差等参数,对提高VLBI台站坐标测定精度及天测、测地VLBI资料解析精度等具有重要意义。常规监测方式占用望远镜工作时间,监测效率低,所得参数精度较差。文章提出通过参数化VLBI天线的旋转运动建立天线固连合作目标在局域网中坐标数学模型的方法,有望实现全天候、全自动监测;考察了代表性数学模型,在观测方程构建、解算参数设置和约束条件选取等方面提出了新的见解。最后通过仿真分析,验证了对方程与参数所做调整的有效性,初步结论可供参考。

The monitoring of the reference point and axis offset of VLBI antenna with high precision is of im- portance to the improvement of the determination precision of station coordinates as well as to the reduction preci-sion of astrometric and geodetic VLBI observations. The nowadays common monitoring method of VLBI antenna would occupy the effective time of operation of the telescope, the efficiency of the monitoring and the precision of determined parameters are low. In the paper, the concept that monitoring VLBI antenna based on parameterized modeling of the antenna rotation was expected to perform all-weather and fully automatic monitoring of the antenna without any interruption of normal observation operation of the telescope. Some representative mathematical models of antenna rotation were discussed, and some insights and analysis concerning the construction of observation e- quation, the selection of unknown parameters and the application of constraint conditions were presented, and fi- nally the result of data simulation analysis proved the validity of the method.