GPS 单点定位中的电离层误差修改函数，采用kolb模型，可改进50 左右的电离层误差-the model of kolb in the GPS single point positioning

北京大学沈长寿等，南极中山站电离层的极区特征，利用数字测高仪，介绍南极电离层分布情况及相应特点。-Peking University Shen longevity, the Antarctic Zhongshan Station polar ionosphere characteristics, the use of digital altimeter, describes the distribution of the Antarctic ionosphere and the correspo