单层模型对GNSS海啸电离层扰动探测的影响分析

本文全面分析了电离层单层模型高度以及投影函数对GNSS海啸电离层扰动探测的影响.利用GNSS计算的电离层扰动绝对空间分布位置随单层高度变化而变化，但对同颗卫星而言，其相对空间分布位置随单层高度变化较小.采用投影函数将倾斜方向的电离层扰动转化到垂直方向上，可以消除海啸传播方向垂直平面外的不一致性；由于电离层扰动存在水平梯度，不能消除海啸传播方向垂直平面上的不一致性.为了减弱单层模型参数对GNSS海啸电离层扰动探测的影响，在数据处理时，除了选择最大电子密度高度作为单层模型高度，还应当对每颗卫星单独进行分析.

The effects of single-layer model on GNSS detection of tsunami-induced ionospheric disturbances

In this paper, we discuss in detail the effects of single-layer model, including single-layer height and projection function, on detection of tsunami-induced ionospheric disturbances using GNSS. The absolute spatial distributions of ionospheric disturbances computed by GNSS vary with the single-layer height while the variation of relative spatial distributions is very small for a same satellite. The inconsistency of ionospheric disturbances beyond the vertical plane across tsunami direction can be eliminated by transforming the ionospheric disturbances from slant direction to vertical direction using projection function. Due to the horizontal gradient of ionospheric disturbances, the inconsistency of ionospheric disturbances in the vertical plane across tsunami direction can't be eliminated. To weaken the single-layer model parameters' effects, we should set the height of ionospheric maximum electron density as the single-layer height and analyze the results separately for satellite in data processing.