TABLE 1
Investigated mapping functions. In the table: ε - elevation angle, H - height of atmosphere, R - Earth radius, a, b, c - mapping function coefficients, h - station height, aht, bht, cht - mapping function coefficients for height, DOY - day of year, φ - latitude, λ - longitude and HEM - hemisphere
| Model | Mathematical Form | Coef a,b,c |
|---|---|---|
| Sine | 1/sin ε | No |
| Geometrical |  | No |
| B & E |  | No |
| Niell |  | F(DOY, h, φ) |
| UNB3m | F(DOY, h, φ) | |
| GMF | F(DOY,Hem,φ,λ) |