IDL编写，对环境卫星进行辐射定标并计算NDVI值。程序设计，1、影像分块，在处理大数据时特别有用；2、XML读取，IDL提供了方便的读写XML的方法；3、日期转儒略日算法；4、表观反射率计算方法；5、字符串处理技巧等。 -IDL to prepare for environmental satellite radiometric calibration and calculate NDVI values. Program design, an image block is particul

通过编程模拟嫦娥卫星奔月的过程，可以对pause参数进行修改延时效果。-By programming simulation process of Chang e moon, you can modify the delay effect of pause parameters.

根据卫星参数完成电离层误差延时和对流层误差延时模型的仿真，从而对码伪距测量数据进行校正，以提高卫星定位精度。(The ionospheric error delay and tropospheric error delay models are simulated according to satellite parameters, and the code pseudo-range measurement data are corrected to improve satellite posi