Correction Method for Higher-Order Ionospheric Effects on the Positionin gand Timing of GPS

摘要

The one of many error sources for Positioning and Timing in GPS is ionospheric refaction error. At present the dual-fre-quencies technique have beeh used as correction first-order ionospheric effect. It have been obtained the accuracy of 3m for positioning or 10ns for timing. For the requirement of higher accuracy it must correct the hgiher-order ionospheric effects.