Something related to SLBM here, found by weibo user
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根据某篇论文,我国“使用某火箭位一固定地点向固定方向进行多次实射”。根据文中的“实测数据”画出的落点和残骸射程数据绘制,得出起飞点为南海北部,向东北方向飞行,延长线指向老美利坚正西海岸,根据惯例和实际情况,数据大概率为试射打高抛,落黄海海域的任务数据。
The paper was published by CASIC and written by Naval Submarine Academy, it mentioned "China fired a type of rocket from a fixed position towards a fixed direction in multiple live firings." And according to the data, the launch position is the northern part of South China Sea and impact position is somewhere in the Yellow Sea, so the projection line extended through to the west coast of CONUS.
The paper link is right here and everyone could check them up. Funny that they still use Matlab 2013 to simulate some data, could be due to sanction that they are using old version of Matlab.