Introduction - If you have any usage issues, please Google them yourself
For the single frequenc y GPS user, the time delay in ionosphere is important mistake. Klobuc har is a conve-
nient and reliable model , which can recti fy the posi tion measuring delay mis take made by single f requency GPS. Display-
ing the analysis and solut ion of this model, is helpful for wri ting the single frequency GPS programe.