An annual variation analysis of the ionospheric spatial gradient over a regional area for GNSS applications

作者：Kim Jeongrae^*; Lee Seung Woo; Lee Hyung Keun

来源：Advances in Space Research, 2014, 54(3): 333-341.

DOI：10.1016/j.asr.2014.03.024

• Ionospheric delay
• Ionospheric spatial gradient
• Ionospheric plate model

An ionospheric spatial gradient represents the ionosphere delay difference between different locations, and its variation over a specific area is important for implementing differential GNSS systems. An estimation method for the ionospheric spatial gradient over a small regional area is proposed. A plate map model is implemented for the direct estimation of the gradients. Nine years of GPS data were processed to figure out the annual variation of the mean gradient at the mid-geomagnetic latitude of 30 degrees N. Gradients along the north-south direction have a mean of 0.65 mm/km and follow solar-cycle variations.

• 出版日期2014-8-1