Also we define three functions: Δ r , Δ s , Δ t {\displaystyle \Delta ^{r},\Delta ^{s},\Delta ^{t}} , which perform differences between receivers, satellites, and time points respectively.
Također definiramo tri funkcije :   Δ r , Δ s , Δ t {\displaystyle \ \Delta ^{r},\Delta ^{s},\Delta ^{t}} koje označuju razlike između prijamnikâ, satelitâ i vremenskih točaka.