galileo ephemeris problem

[zhengjialiang2]

Hello! I downloaded a rnx file from ftp://ftp.pecny.cz/LDC/orbits_brd/gop3/2021/ ,then I found that there are two different ephemeris of a single galileo satellite at the same time like below. Does anybody can tell me why?

E01 2021 02 05 00 00 00-1.039387774650e-03-8.029132914090e-12 0.000000000000e+00 8.000000000000e+01 1.427812500000e+02 3.004410860060e-09-9.341216454590e-01 6.711110472680e-06 2.636719727890e-04 6.077811121940e-06 5.440614204410e+03 4.320000000000e+05 4.470348358150e-08 2.534694323870e+00-5.215406417850e-08 9.793612342810e-01 2.190312500000e+02 1.716587152570e-01-5.722024059560e-09 2.025084352890e-10 5.160000000000e+02 2.143000000000e+03 0.000000000000e+00 3.120000000000e+00 0.000000000000e+00 2.328306436540e-10 2.328306436540e-10 4.326640000000e+05 E01 2021 02 05 00 00 00-1.039387832861e-03-8.043343768804e-12 0.000000000000e+00 8.000000000000e+01 1.427812500000e+02 3.004410860057e-09-9.341216454589e-01 6.711110472679e-06 2.636719727889e-04 6.077811121941e-06 5.440614204407e+03 4.320000000000e+05 4.470348358154e-08 2.534694323873e+00-5.215406417847e-08 9.793612342808e-01 2.190312500000e+02 1.716587152574e-01-5.722024059555e-09 2.025084352892e-10 2.580000000000e+02 2.143000000000e+03 0.000000000000e+00 3.120000000000e+00 0.000000000000e+00 2.328306436539e-10 0.000000000000e+00 4.327000000000e+05 E01 2021 02 05 00 10 00-1.039392605890e-03-8.043343768800e-12 0.000000000000e+00 8.100000000000e+01 1.421250000000e+02 2.990124550690e-09-8.593817415680e-01 6.686896085740e-06 2.639790764080e-04 5.980953574180e-06 5.440614841460e+03 4.326000000000e+05 5.029141902920e-08 2.534690865530e+00-5.587935447690e-08 9.793613761840e-01 2.215625000000e+02 1.713043321300e-01-5.717738166750e-09 2.028655930230e-10 5.160000000000e+02 2.143000000000e+03 0.000000000000e+00 3.120000000000e+00 0.000000000000e+00 2.328306436540e-10 2.328306436540e-10 4.332640000000e+05 E01 2021 02 05 00 10 00-1.039392605890e-03-8.043343768804e-12 0.000000000000e+00 8.100000000000e+01 1.421250000000e+02 2.990124550690e-09-8.593817415676e-01 6.686896085739e-06 2.639790764078e-04 5.980953574181e-06 5.440614841461e+03 4.326000000000e+05 5.029141902924e-08 2.534690865534e+00-5.587935447693e-08 9.793613761838e-01 2.215625000000e+02 1.713043321302e-01-5.717738166745e-09 2.028655930234e-10 2.580000000000e+02 2.143000000000e+03 0.000000000000e+00 3.120000000000e+00 0.000000000000e+00 2.328306436539e-10 0.000000000000e+00 4.333000000000e+05

[diddlum]

INAV (E1B/E5b) and FNAV (E5a) messages. Look at those 516 and 258 in broadcast orbit 5. You will also see you have two bgds at bo 6 in the first message and only one in the second. See Galileo navigation data in RINEX doc file of that RINEX version.

[tomojitakasu]

One is I/NAV and another is F/NAV. You can identify whether I/NAV or F/NAV with the data sources filed (the 2nd field of the 6th line) in RINEX NAV.

[zhengjialiang2]

Thank you for your answers.