电离层的延迟模型IRI-2001,输入参数为太阳黑子数，可以得到电离层VTEC的值。-Delay model of the ionosphere IRI-2001, the input parameters for the sunspot number, you can get the value of ionospheric VTEC.

matlab生成一个随机相位屏，可以模拟大气和电离层，结果为彩色图。(Matlab generates a random phase screen, which can simulate the atmosphere and the ionosphere. The result is a color map.)