Pembuatan Program Ekstraksi Dan Penentuan Posisi Satelit Dari File Navigation Rinex Versi 2.10

Abstract

In positioning using the GPS the first step that we must do is calculating the satellite position during the observation. The precision of a point in a GPS survey is affected by the precision of the satellite position that recorded in the observation, the higher number of the satellite that is being recorded the more precise of the position can be. In surveying using GPS, GPS receiver will receive informations related to the satellite that is being observed. These information is given in navigation message, and the content of the message usually related to the satellite orbit's component (Kepler's element) and time correction satellite's component. To obtain the navigation message data in a standard format we can convert the measuring result of the GPS to the RINEX ver. 2.10 format. From the format we can get time reference data when epoch (Epoch, a0, a1, a2, and Toe), pertubation parameters satellite (Idot, Delta_N (∆n), Ωdot (Ω), CRS, CRC, CUS, CUC, CIC, and CIS), and keplerian parameters (Eccentricity (e), i0, Ω0, M0, ω, Sqrt_a (√a)), then from the data we made it into GPS satellite positioning program using visual basic language. The result is an extraction program and satellite position's calculation, then the calculation's result of satellite position using FMP 1.0 is being compared with the precise ephemerides provided by IGS, the result of the comparison shows that this program is effective to be used in observation with interval of 4 hours to to