IMPROVING THE ACCURACY OF RESIDUAL IONOSPHERIC ERRORS IN THE GPS NAVIGATION SYSTEM

To improving accuracy of positioning in the GPS navigation system we need to eliminate ionospheric errors or at least reduce their effect.In this research we are going to introduce the suggested solutions to improving the accuracy of residual ionospheric errors. Create new ionospheric mathematical model without neglect higher orders that helps to eliminate ionospheric errors comparing to others models and making evaluations between all orders.