NMEA data instead of brdc file

[ajayavgarde]

Can the NMEA data directly be passed from the GPS receiver to the program instead of brdc file

[osqzss]

NMEA format doesn't contain satellite ephemeris data.

[ajayavgarde]

is there a way that i can extract the satellite ephemeris data using GPS receiver

[ajayavgarde]

can I get the ephemeris data using ublox instead of downloading it from the website?

[osqzss]

You have to extract the ephemeris by yourself from UBX-RXM-SFRBX: https://www.u-blox.com/en/technologies/gnss-raw-data

[ajayavgarde]

Okay thanks, I will convert the data from UBX-RXM-SFRBX to RINEX format and pass it to gpssim . will it work?

[osqzss]

You can use RTKCONV in RTKLIB applications to generate RINEX navigation file from UBX-RXM-SFRBX. https://github.com/tomojitakasu/RTKLIB

[ajayavgarde]

okay, thank you for the information, and nice work on the code!

[ajayavgarde]

Should i keep on download the brdc file every time they upload on NASA website

[Imtiaz08]

You need the latest satellite ephemeris information. So technically, yes you will need to download the latest file unless and until you are using your own data.