No FCB File Exist

[MertBezcioglu]

I'm trying to a process with PPP-AR mode. I put the FCB file I downloaded from here (https://github.com/FCB-SGG/FCB-FILES) or the jxfXXXXX.fcb file I downloaded with the net_diff program in the P1C1 DCB line. But on both of them the program gives "No FCB File Exist" error. At which stage or where am I making a mistake?

[YizeZhang]

Hi, the FCB products generated by Wuhan University is currently not supported by Net_Diff. Only the cnt*****.bia by CNES and jxf*****.fcb by JAXA is supported. For the CNES products, you need to download cnt*****.bias file on the GNSS BSX line (P1C1 DCB file is optional). For the JAXA products, you need to download both the jxf*****.fcb file on the FCB line and the ****.bsx file on the GNSS BSX line. All these can be done by just click the DOWNLOAD button. Personally, I suggest to use the CNES products.

[MertBezcioglu]

Thank you for kindly reply and support, it worked. When I check the results, I see that the Kinematic PPP-AR mode supports only GPS and GPS+GLONASS combinations. Because there is no difference between GPS and GPS+GALILEO or GPS+GLONASS and GPS+GLONASS+GALILEO results. Am I wrong?

[YizeZhang]

If you are using jxf products, then there is only GPS and GLONASS orbit and clock information(but only support GPS PPP-AR). If you are using CNES products, it supports GPS+GLONASS+BDS+Galileo.

[MertBezcioglu]

I used the cnt*****.sp3/clk/bia files for the Kinematic PPP-AR solution but i got the " no reference satellite found" message for GALILEO in the log file.

[YizeZhang]

I test it again using IGS station, the result is normal and there is no such error information for Galileo. So I think maybe it is due to the problem of data? Could you send me your data through email?
Besides, for PPP-AR, the precision BDS corrections are not so accurate. So currently it is not recommended to use BDS in PPP-AR, or at least don't use BDS GEO satellites.

[YizeZhang]

Hello, I check your data. The RINEX data format is 2.11, and the Galileo data type is E1 and E5 (not E5a). I'm sorry that Net_Diff currently only supports E1+E5a for Galileo in RINEX 2.XX format.
If you want to process E5 data, (1) you should use the RINEX 3.XX format; (2) Please select the Mix option on the Frequency popup-menu and then choose the corresponding frequency for each system.

[YizeZhang]

Hello, FCB file from WHU (ftp://igs.gnsswhu.cn//pub/whu/phasebias/year/bias/) is supported now.

[MertBezcioglu]

Hello, Thank you for your information. This is really good news. It will be very useful as soon as they support multi-GNSS.