Rinex data processing for L5 frequency only

Reach Module / M+ / M2 RTK / PPK configuration
1

I’d like to know if it’s possible to process observation files using L5 frequency only. By converting the observation file and then processing it, I should obtain a pos file. However, when I analyze the converted file, the resulting pos file is empty. Is it possible to analyze observation files for L5 frequency only? Do we necessarily need the L1 base frequency to obtain a result? Is it necessary to modify the source code to obtain a unique L5 analysis?

Note that when I process a file converted for L1 + L5 frequencies, the resulting pos file is identical to the pos file obtained with L1 only.

2

What receiver are you using?

4

By receiver you mean navigation satellite? (= GPS and QZSS) I can show you the configurations I use for my observation data:

rtkpost options (2023/06/13 07:52:59, v.2.4.2)

pos1-posmode =single # (0:single,1:dgps,2:kinematic,3:static,4:movingbase,5:fixed,6:ppp-kine,7:ppp-static)
pos1-frequency =l1 # (1:l1,2:l1+l2,3:l1+l2+l5,4:l1+l2+l5+l6,5:l1+l2+l5+l6+l7)
pos1-soltype =forward # (0:forward,1:backward,2:combined)
pos1-elmask =10 # (deg)
pos1-snrmask_r =off # (0:off,1:on)
pos1-snrmask_b =off # (0:off,1:on)
pos1-snrmask_L1 =0,0,0,0,0,0,0,0,0
pos1-snrmask_L2 =0,0,0,0,0,0,0,0,0
pos1-snrmask_L5 =0,0,0,0,0,0,0,0,0
pos1-dynamics =off # (0:off,1:on)
pos1-tidecorr =on # (0:off,1:on)
pos1-ionoopt =brdc # (0:off,1:brdc,2:sbas,3:dual-freq,4:est-stec,5:ionex-tec,6:qzs-brdc,7:qzs-lex,8:vtec_sf,9:vtec_ef,10:gtec)
pos1-tropopt =saas # (0:off,1:saas,2:sbas,3:est-ztd,4:est-ztdgrad)
pos1-sateph =brdc # (0:brdc,1:precise,2:brdc+sbas,3:brdc+ssrapc,4:brdc+ssrcom)
pos1-posopt1 =on # (0:off,1:on)
pos1-posopt2 =on # (0:off,1:on)
pos1-posopt3 =on # (0:off,1:on)
pos1-posopt4 =on # (0:off,1:on)
pos1-posopt5 =off # (0:off,1:on)
pos1-exclsats = # (prn …)
pos1-navsys =17 # (1:gps+2:sbas+4:glo+8:gal+16:qzs+32:comp)

6

Nope, mean what make and model of GNSS receiver are you using?

7

All I know is that the observation data comes from MIZU00JPN, the IGS satellite located in Japan.

8

I’m guessing the receiver doesn’t process L5.

9

How can you check to be sure? In your opinion, isn’t it possible to modify the source code to obtain a pos file with L1+L5?

10

Well, after checking an observation file from that station, it seems the receiver is a Septentrio PolaRx5. This tracks every frequency.

But the question remains: are you doing differential correction? What is your “rover” GNSS brand and model?

11

I don’t think the source, make or model is important, because when I use another processing tool, there’s a difference between the files for L1, L1-L2 and L1-L5. But this doesn’t work with rtklib.

And I don’t know how to tell if a differential correction has been made.

12

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