地球参考框架建立的进展与非线性维持的思考

Progress in the Establishment of the Terrestrial Reference Frame and Consideration of Non-linear Maintenance

为实现毫米级地球参考框架,必须逐步完善高精度非线性维持技术。本文首先详细介绍了地球参考框架的建立进展,包括国际地球参考框架和历元参考框架的建立历程;然后对非线性维持技术的研究现状进行阐述,指出对地球参考框架非线性维持的两种思路,包括基准站非线性变化建模和历元参考框架建立。最后对构建毫米级地球参考框架提出展望,建议适当增加和完善地面监测网,特别是南半球欠发达地区,利用更长、更大范围的原始数据积累,完善现有框架;增加坐标非线性运动和地心运动的数据积累,并进行深入分析,从而建立精确的改正模型;尽可能准确识别坐标时间序列中的噪声,建立格网噪声模型,从而更加精准地分离真实信号和噪声。

In order to a realize millimeter-scale terrestrial reference frame,high-precision non-linear maintenance technology must be gradually improved.Firstly,this paper introduces the progress of the establishment of the terrestrial reference frame including the establishment of the International Terrestrial Reference Frame and the epoch reference frames;Then,the research status of non-linear maintenance technology is described,and two ideas for non-linear maintenance of the terrestrial reference frame are pointed out,including the non-linear change modeling of the reference station and the establishment of the epoch reference frames.At last,the paper puts forward a prospect for the construction of the millimeter-scale terrestrial reference frame,and suggests that the ground monitoring network should be appropriately increased and improved,especially in the underdeveloped areas of the southern hemisphere,and the existing frame should be improved by using longer and broader original data accumulation;Increase the data accumulation of coordinate non-linear motion and geocentric motion,and conduct in-depth analysis,to establish an accurate correction model;Identify the noise factors in the coordinate time series as accurately as possible,and establish a grid noise model to more accurately separate the actual signal and noise.