Combining gps-sdr-sim with GNSS-SDR

[robellebor]

In order to generate a navigation file with a current RINEX file instead off past RINEX files downloaded from sites, i think its better to combine it with "https://github.com/gnss-sdr/gnss-sdr" ... what gnss-sdr does is, it receives signal from the satellite and it gives us organized RINEX files , (gps_ephemeris.xml file, .17N file, .17O file, nmea_pvt.nmea file, .geojson file, .kml file and .rtcm file) so the gps-sdr-sim can read this recent files and generate a signal similar to the signals that are generated by the satellite at that moment.

All we have to do is save the GNSS-SDR "receiver.conf" file inside the gps-sdr-sim directory and run it...

[osqzss]

We welcome your contribution.

[Fles42]

hi,

how do you use RINEX data from GNSS-SDR to GPS-SIM-SDR? I tried, but RINEX from ftp://cddis.gsfc.nasa.gov/gnss/data/daily/ is version 2 and file from GNSS-SDR is version 2.11. During the test i received the meesage: ERROR: no current set of ephemerides not found.

Thanks, Tomáš

[osqzss]

GPS-SDR-SIM should be capable of reading RINEX GPS navigation message data in version 2.11 format. ftp://igs.org/pub/data/format/rinex211.txt

Would you show me an example RINEX navigation file generated by GNSS-SDR?

[Fles42]

Thanks for your respoponse.

Here is a example RINEX fire from GNSS-SDR from yesterday:

 2.11           N: GNSS NAV DATA    G: GPS              RINEX VERSION / TYPE

GNSS-SDR ras 20180306 150511 UTC PGM / RUN BY / DATE GPS NAVIGATION MESSAGE FILE GENERATED BY GNSS-SDR COMMENT
GNSS-SDR VERSION 0.0.9.git-next-e352978 COMMENT
See http://gnss-sdr.org COMMENT
GPSA .0000D+00 .0000D+00 .0000D+00 .0000D+00 IONOSPHERIC CORR
GPSB .0000D+00 .0000D+00 .0000D+00 .0000D+00 IONOSPHERIC CORR
GPUT .0000000000D+00 .000000000D+00 0 1024 TIME SYSTEM CORR
0 0 0 0 LEAP SECONDS
END OF HEADER
G12 2018 03 06 16 00 00 .346813816577D-03 -.204636307899D-11 .000000000000D+00 .120000000000D+02 -.429375000000D+02 .401945314064D-08 .736296738560D+00 -.224076211452D-05 .704509869684D-02 .618956983089D-05 .515363424492D+04 .230400000000D+06 -.800937414169D-07 .300103899846D+01 .428408384323D-07 .987519827467D+00 .274500000000D+03 .931035940150D+00 -.802783439153D-08 -.411088552060D-09 .100000000000D+01 .199100000000D+04 .100000000000D+01 .000000000000D+00 .000000000000D+00 -.125728547573D-07 .120000000000D+02 .227118000000D+06 .400000000000D+01
G19 2018 03 06 16 00 00 -.452678650618D-03 .261479726760D-11 .000000000000D+00 .490000000000D+02 -.173750000000D+02 .383051669925D-08 .821442094943D+00 -.791624188423D-06 .973077991512D-02 .109001994133D-04 .515370693779D+04 .230400000000D+06 -.175088644028D-06 -.220100938675D+01 -.819563865662D-07 .979610177587D+00 .185812500000D+03 .113187242922D+01 -.781889711702D-08 .328585115460D-10 .100000000000D+01 .199100000000D+04 .100000000000D+01 .000000000000D+00 .000000000000D+00 -.153668224812D-07 .490000000000D+02 .227118000000D+06 .400000000000D+01

GSDR065q04.zip

[alkuna]

This is not a RINEX 2.11 file, but RINEX 3.01 with wrong header. See ftp://igs.org/pub/data/format/rinex211.txt and https://kb.igs.org/hc/en-us/article_attachments/115007741928/rinex301.pdf. Support for RINEX 3.x is almost done. Give me some more time please.

[osqzss]

It clearly violates the version 2.11 format in many ways. For example, the satellite PRN number has to be a two-digit integer without 'G' character, and the year value of TOC has to be a two-digit as well. GPS-SDR-SIM cannot recognize any non-standard input files.

[Fles42]

Hi, thanks fo your answers.

I changed some parameters in GNSS-SDR for RINEX v2.11 and now I get, I think, correctly file. But I still get the same error message. It is beceuse zeros in ION ALPHA, ION BETA and DELTA-UTC: A0,A1,T,W?

 2.11           N: GPS NAV DATA                         RINEX VERSION / TYPE

GNSS-SDR ras 7-MAR-18 13:25 PGM / RUN BY / DATE GPS NAVIGATION MESSAGE FILE GENERATED BY GNSS-SDR COMMENT
GNSS-SDR VERSION 0.0.9.git-next-e352978 COMMENT
See http://gnss-sdr.org COMMENT
.0000D+00 .0000D+00 .0000D+00 .0000D+00 ION ALPHA
.0000D+00 .0000D+00 .0000D+00 .0000D+00 ION BETA
.000000000000D+00 .000000000000D+00 0 1024 DELTA-UTC: A0,A1,T,W 0 LEAP SECONDS
END OF HEADER
1 18 3 7 14 0 0.0 -.327280722558D-04 -.227373675443D-11 .000000000000D+00 .580000000000D+02 .112500000000D+01 .444518515980D-08 .100087949819D+01 -.111758708954D-07 .740886246786D-02 .749528408051D-05 .515367296982D+04 .309600000000D+06 .204890966415D-07 -.124547757679D+01 .819563865662D-07 .970108211598D+00 .239843750000D+03 .610427899001D+00 -.813605318499D-08 .315370279295D-09 .100000000000D+01 .199100000000D+04 .100000000000D+01 .000000000000D+00 .000000000000D+00 .558793544769D-08 .580000000000D+02 .307488000000D+06 .400000000000D+01

GSDR066o23.zip

[alkuna]

I had no problem processing the file, see log.txt Still, the file is not perfect. There is a spare space between the columns, but it just reduces the resolution. I also attach your RINEX file fixed by teqc.

log.txt.gz GSDR066o23.18N.gz

[DarshanNathvani]

This is not a RINEX 2.11 file, but RINEX 3.01 with wrong header. See ftp://igs.org/pub/data/format/rinex211.txt and https://kb.igs.org/hc/en-us/article_attachments/115007741928/rinex301.pdf. Support for RINEX 3.x is almost done. Give me some more time please.

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