Research on the Method for Realizing Datum Uniformity of Cross-region Reference Stations

Railway reference stations are characterized by long span, strip distribution, cross-regional service, weak graphical structure, and requiring high monitoring precision. In view of this, the traditional modeling approaches for reference uniformity have become no longer quite applicable. Currently, coordinates reference maintenance is conducted separately in each area, so that there exist differences among various reference stations in respect of data processing software, mathematical physical model, solution strategy, adjustment method, and revision cycle. This causes systematic deviation in satellite navigation and positioning service reference between different areas. To ensure the uniformity and timeliness of high-precision location-based service reference of national railways, this study is intended to simulate cross-region, strip, isoheight-shape and Y-shape layout modes based on the actual situation of railway observation network, and implement selection of reference station control points, networking solution scheme design and result analysis considering the reference uniformity solution requirements of different layout modes to propose an inclusive coordinates reference uniformity solution scheme applicable for various strip layout modes and provide a practicable reference for the coordinates reference uniformity solution of reference stations of railways and shipping lanes. This is significant to the coordinates uniformity and regular updating maintenance of high-precision service datum network of railways.