The paper derives spherical ray-tracing travel-time derivatives and applies them to one GPS observation set, reporting position error reduced from 8 m to 4.6 m when conventional tropospheric and ionospheric corrections are used.
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SPP location with spherical ray tracing by refractive index
The paper derives spherical ray-tracing travel-time derivatives and applies them to one GPS observation set, reporting position error reduced from 8 m to 4.6 m when conventional tropospheric and ionospheric corrections are used.