中文说明：
matlab编程实现从东北天坐标系到地心坐标系的坐标转换，包含了资料文件。调用函数名为：ENVtoECEF，输入参数为东北天原点经纬度数据，东北天坐标点数据；输出数据是东北天坐标系下坐标点对应的经纬高数据。
English Description：
Matlab programming realizes the coordinate transformation from the northeast sky coordinate system to the geocentric coordinate system, including data files. The calling function name is envtoecef, the input parameters are longitude and latitude data of northeast sky origin and coordinate point data of northeast sky; the output data is longitude and latitude height data corresponding to coordinate point in northeast sky coordinate system.