Hi, i have obtained a set of data from simulation from GISM software...\r\n\r\nhowever, i do not know how to calculate DOP and UERE based on the summary the data given me..the simulation provided me something like this.. \r\n\r\n\r\nPRN \r\nUT \r\nLT \r\nazimuth \r\nelevation \r\nsat.lat \r\nsat.long \r\nS4 \r\nsigma_phi \r\nAngular deviation \r\nCoh. length \r\nPLL \r\n DLL \r\n C / N \r\nProba of LoL\r\nRange error \r\nFaraday rotation \r\npseudo range \r\nDoppler(Hz) \r\nDistance error \r\nAngular error\r\n \r\n\r\n1) DOP can be obtained from standard deviation of position of satellite right? but anyone tell me how to get altitude to obtain its ECEF position? =)\r\n\r\n2) Is Range Error (typically > 4 and < 15) the UERE ? \r\n\r\nHope that there's someone here who can help me to solve my puzzled mind... thanks!