![]() ![]() Thence, considering a reference time scale T, which we will call GNSS (i.e., GPS, GLONASS, Galileo), the pseudorange measurement for satellite s and receiver r may be expressed as: Taking explicitly into account possible synchronism errors between these clocks, the travelling time between transmission and reception is obtained as a difference of times measured in two different clocks or time scales: the satellite ( t^s) and the receiver ( t_r). This measurement D= c\Delta T is what we know as pseudorange or pseudodistance and it is an "apparent range" between the satellite and the receiver that does not match with its geometric distance due to, among other factors, synchronism errors between receiver and satellite clocks. Figure 1: Determination of the signal travelling time. ![]()
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