MSM7 Decoding gives CELLPRN equal to NaN

[alainmuls]

Hi All,

I decode RTCM message and convert them into CSV files. I use
msm7_tuple = rtcmhelpers.parse_msm(msg=msg)
which holds an indentifier, rough data and fine data sub-sictionaries.
During decoding the fine data dict, I stumbled on an error, since the msm7_fine_data["CELLPRN"] yiels also N/A as value, so the PRN is not known. For now I just skip these cells, but it should have a valid number.

This is an output of my logging

2025-03-30 15:00:22,306 INFO: Skipping fine data decoding for cell 34 due to N/A PRN.
67 │ 2025-03-30 15:00:22,306 INFO: Skipping fine data decoding for cell 35 due to N/A PRN.
68 │ 2025-03-30 15:00:22,306 INFO: Skipping fine data decoding for cell 36 due to N/A PRN.
69 │ 2025-03-30 15:00:22,306 INFO: Skipping fine data decoding for cell 37 due to N/A PRN.

It usually happens (tested only an 1 dataset) for celss above 34 apparently.

Can you explain this error?

kind regards
Alain

[semuadmin]

Hi @alainmuls,

I can try, but I'll need to see your COMPLETE Python script and a copy of the raw binary RTCM3 data stream you're attempting to parse.

FYI my test cases for pyrtcm include numerous examples of MSM7 messages where NCell > 34, and parsing appears to be successful, e.g:

from pyrtcm import RTCMReader, parse_msm

with open("/tests/pygpsdata-NTRIP-USCL00CHL0.log", "rb") as stream:
    rtr = RTCMReader(stream)
    for raw, parsed in rtr:
        if parsed.identity[-1:] == "7" and getattr(parsed, "NCell", 0) > 34:
            print(parsed)
            print(parse_msm(parsed))
            break

<RTCM(1077, DF002=1077, DF003=0, DF004=318945000, DF393=1, DF409=0, DF001_7=0, DF411=0, DF412=0, DF417=0, DF418=0, DF394=17762381648302702592, NSat=10, DF395=1346437634, NSig=6, DF396=1132932382022422072, NCell=42, PRN_01=001, PRN_02=002, PRN_03=003, PRN_04=004, PRN_05=006, PRN_06=007, PRN_07=009, PRN_08=017, PRN_09=019, PRN_10=021, DF397_01=68, DF397_02=76, DF397_03=70, DF397_04=67, DF397_05=78, DF397_06=83, DF397_07=71, DF397_08=76, DF397_09=78, DF397_10=79, ExtSatInfo_01=0, ExtSatInfo_02=0, ExtSatInfo_03=0, ExtSatInfo_04=0, ExtSatInfo_05=0, ExtSatInfo_06=0, ExtSatInfo_07=0, ExtSatInfo_08=0, ExtSatInfo_09=0, ExtSatInfo_10=0, DF398_01=0.939453125, DF398_02=0.2998046875, DF398_03=0.3828125, DF398_04=0.841796875, DF398_05=0.4033203125, DF398_06=0.876953125, DF398_07=0.677734375, DF398_08=0.5302734375, DF398_09=0.4326171875, DF398_10=0.4169921875, DF399_01=299, DF399_02=701, DF399_03=95, DF399_04=152, DF399_05=-632, DF399_06=-765, DF399_07=-309, DF399_08=422, DF399_09=101, DF399_10=805, CELLPRN_01=001, CELLSIG_01=1C, CELLPRN_02=001, CELLSIG_02=1W, CELLPRN_03=001, CELLSIG_03=2W, CELLPRN_04=001, CELLSIG_04=2L, CELLPRN_05=001, CELLSIG_05=5Q, CELLPRN_06=002, CELLSIG_06=1C, CELLPRN_07=002, CELLSIG_07=1W, CELLPRN_08=002, CELLSIG_08=2W, CELLPRN_09=003, CELLSIG_09=1C, CELLPRN_10=003, CELLSIG_10=1W, CELLPRN_11=003, CELLSIG_11=2W, CELLPRN_12=003, CELLSIG_12=2L, CELLPRN_13=003, CELLSIG_13=5Q, CELLPRN_14=004, CELLSIG_14=1C, CELLPRN_15=004, CELLSIG_15=1W, CELLPRN_16=004, CELLSIG_16=2W, CELLPRN_17=004, CELLSIG_17=2L, CELLPRN_18=004, CELLSIG_18=5Q, CELLPRN_19=004, CELLSIG_19=1L, CELLPRN_20=006, CELLSIG_20=1C, CELLPRN_21=006, CELLSIG_21=1W, CELLPRN_22=006, CELLSIG_22=2W, CELLPRN_23=006, CELLSIG_23=2L, CELLPRN_24=006, CELLSIG_24=5Q, CELLPRN_25=007, CELLSIG_25=1C, CELLPRN_26=007, CELLSIG_26=1W, CELLPRN_27=007, CELLSIG_27=2W, CELLPRN_28=009, CELLSIG_28=1C, CELLPRN_29=009, CELLSIG_29=1W, CELLPRN_30=009, CELLSIG_30=2W, CELLPRN_31=009, CELLSIG_31=2L, CELLPRN_32=009, CELLSIG_32=5Q, CELLPRN_33=017, CELLSIG_33=1C, CELLPRN_34=017, CELLSIG_34=1W, CELLPRN_35=017, CELLSIG_35=2W, CELLPRN_36=017, CELLSIG_36=2L, CELLPRN_37=019, CELLSIG_37=1C, CELLPRN_38=019, CELLSIG_38=1W, CELLPRN_39=019, CELLSIG_39=2W, CELLPRN_40=021, CELLSIG_40=1C, CELLPRN_41=021, CELLSIG_41=1W, CELLPRN_42=021, CELLSIG_42=2W, DF405_01=0.0003269463777542114, DF405_02=0.00032570958137512207, DF405_03=0.0003551114350557327, DF405_04=0.0003554355353116989, DF405_05=0.0003531314432621002, DF405_06=0.00044614076614379883, DF405_07=0.0004421919584274292, DF405_08=0.00047398172318935394, DF405_09=-0.00043528899550437927, DF405_10=-0.00043588317930698395, DF405_11=-0.00040896423161029816, DF405_12=-0.0004068128764629364, DF405_13=-0.0004071984440088272, DF405_14=0.00043116696178913116, DF405_15=0.0004300791770219803, DF405_16=0.0004497244954109192, DF405_17=0.0004500187933444977, DF405_18=0.00046171993017196655, DF405_19=0.00043155625462532043, DF405_20=-0.00020522251725196838, DF405_21=-0.00020623579621315002, DF405_22=-0.00016688741743564606, DF405_23=-0.00016376934945583344, DF405_24=-0.00015792995691299438, DF405_25=-0.0002510659396648407, DF405_26=-0.00025218352675437927, DF405_27=-0.0001898389309644699, DF405_28=-0.00026627443730831146, DF405_29=-0.0002680625766515732, DF405_30=-0.00024024397134780884, DF405_31=-0.00023896992206573486, DF405_32=-0.00023722276091575623, DF405_33=0.00029537081718444824, DF405_34=0.0002936720848083496, DF405_35=0.0003285575658082962, DF405_36=0.000330507755279541, DF405_37=-0.0004242565482854843, DF405_38=-0.0004289243370294571, DF405_39=-0.0004002377390861511, DF405_40=-0.0001002773642539978, DF405_41=-0.00010454095900058746, DF405_42=-4.892423748970032e-05, DF406_01=0.00029169488698244095, DF406_02=0.00029169488698244095, DF406_03=0.00029748398810625076, DF406_04=0.00029911240562796593, DF406_05=0.0002920180559158325, DF406_06=0.00034324172884225845, DF406_07=0.00034324172884225845, DF406_08=0.00029890984296798706, DF406_09=-0.0004791910760104656, DF406_10=-0.0004791910760104656, DF406_11=-0.000478383619338274, DF406_12=-0.00047512631863355637, DF406_13=-0.00048177503049373627, DF406_14=0.0004361076280474663, DF406_15=0.0004361076280474663, DF406_16=0.00045655621215701103, DF406_17=0.0004695877432823181, DF406_18=0.0004842812195420265, DF406_19=0.0004513435997068882, DF406_20=-0.0001957709901034832, DF406_21=-0.0001957709901034832, DF406_22=-0.0001523960381746292, DF406_23=-0.00015482446178793907, DF406_24=-0.00014885328710079193, DF406_25=-0.00025010714307427406, DF406_26=-0.00025010714307427406, DF406_27=-0.00019579380750656128, DF406_28=-0.00024043582379817963, DF406_29=-0.00024043582379817963, DF406_30=-0.00020435266196727753, DF406_31=-0.00019619334489107132, DF406_32=-0.00018227798864245415, DF406_33=0.00024057738482952118, DF406_34=0.00024057738482952118, DF406_35=0.00022796867415308952, DF406_36=0.00023368187248706818, DF406_37=-0.00045369984582066536, DF406_38=-0.00045369984582066536, DF406_39=-0.0004687071777880192, DF406_40=-0.0002686530351638794, DF406_41=-0.0002686530351638794, DF406_42=-0.000329410657286644, DF407_01=638, DF407_02=638, DF407_03=638, DF407_04=638, DF407_05=638, DF407_06=646, DF407_07=646, DF407_08=646, DF407_09=635, DF407_10=635, DF407_11=635, DF407_12=635, DF407_13=635, DF407_14=622, DF407_15=622, DF407_16=622, DF407_17=623, DF407_18=623, DF407_19=623, DF407_20=559, DF407_21=558, DF407_22=558, DF407_23=559, DF407_24=559, DF407_25=391, DF407_26=377, DF407_27=377, DF407_28=582, DF407_29=582, DF407_30=582, DF407_31=584, DF407_32=588, DF407_33=619, DF407_34=619, DF407_35=619, DF407_36=619, DF407_37=604, DF407_38=604, DF407_39=604, DF407_40=649, DF407_41=649, DF407_42=649, DF420_01=0, DF420_02=0, DF420_03=0, DF420_04=0, DF420_05=0, DF420_06=0, DF420_07=0, DF420_08=0, DF420_09=0, DF420_10=0, DF420_11=0, DF420_12=0, DF420_13=0, DF420_14=0, DF420_15=0, DF420_16=0, DF420_17=0, DF420_18=0, DF420_19=0, DF420_20=0, DF420_21=0, DF420_22=0, DF420_23=0, DF420_24=0, DF420_25=0, DF420_26=0, DF420_27=0, DF420_28=0, DF420_29=0, DF420_30=0, DF420_31=0, DF420_32=0, DF420_33=0, DF420_34=0, DF420_35=0, DF420_36=0, DF420_37=0, DF420_38=0, DF420_39=0, DF420_40=0, DF420_41=0, DF420_42=0, DF408_01=49.4375, DF408_02=52.0625, DF408_03=52.0625, DF408_04=45.6875, DF408_05=54.1875, DF408_06=43.0, DF408_07=31.3125, DF408_08=31.3125, DF408_09=49.5, DF408_10=51.9375, DF408_11=51.9375, DF408_12=45.6875, DF408_13=53.3125, DF408_14=49.0, DF408_15=43.8125, DF408_16=43.8125, DF408_17=50.0625, DF408_18=54.625, DF408_19=50.5, DF408_20=39.75, DF408_21=35.75, DF408_22=35.75, DF408_23=39.5, DF408_24=44.625, DF408_25=34.125, DF408_26=18.625, DF408_27=18.625, DF408_28=48.0, DF408_29=50.625, DF408_30=50.625, DF408_31=44.6875, DF408_32=52.125, DF408_33=40.5625, DF408_34=34.75, DF408_35=34.75, DF408_36=37.5625, DF408_37=40.875, DF408_38=27.375, DF408_39=27.375, DF408_40=38.4375, DF408_41=19.375, DF408_42=19.375, DF404_01=-0.274, DF404_02=-0.274, DF404_03=-0.2741, DF404_04=-0.2722, DF404_05=-0.27290000000000003, DF404_06=-0.1899, DF404_07=-0.1899, DF404_08=-0.192, DF404_09=0.41850000000000004, DF404_10=0.41850000000000004, DF404_11=0.4178, DF404_12=0.40740000000000004, DF404_13=0.4188, DF404_14=-0.27340000000000003, DF404_15=-0.27340000000000003, DF404_16=-0.2728, DF404_17=-0.275, DF404_18=-0.2743, DF404_19=-0.2702, DF404_20=0.0712, DF404_21=0.0712, DF404_22=0.0732, DF404_23=0.0863, DF404_24=0.0383, DF404_25=0.06430000000000001, DF404_26=0.06430000000000001, DF404_27=0.068, DF404_28=0.3657, DF404_29=0.3657, DF404_30=0.366, DF404_31=0.3947, DF404_32=0.37670000000000003, DF404_33=0.4339, DF404_34=0.4339, DF404_35=0.4335, DF404_36=0.454, DF404_37=-0.4262, DF404_38=-0.4262, DF404_39=-0.42710000000000004, DF404_40=-0.21150000000000002, DF404_41=-0.21150000000000002, DF404_42=-0.2124)>
({'identity': '1077', 'gnss': 'GPS', 'station': 0, 'epoch': 318945000, 'sats': 10, 'cells': 42}, [{'PRN': '001', 'DF397': 68, 'DF398': 0.939453125, 'DF399': 299, 'ExtSatInfo': 0}, {'PRN': '002', 'DF397': 76, 'DF398': 0.2998046875, 'DF399': 701, 'ExtSatInfo': 0}, {'PRN': '003', 'DF397': 70, 'DF398': 0.3828125, 'DF399': 95, 'ExtSatInfo': 0}, {'PRN': '004', 'DF397': 67, 'DF398': 0.841796875, 'DF399': 152, 'ExtSatInfo': 0}, {'PRN': '006', 'DF397': 78, 'DF398': 0.4033203125, 'DF399': -632, 'ExtSatInfo': 0}, {'PRN': '007', 'DF397': 83, 'DF398': 0.876953125, 'DF399': -765, 'ExtSatInfo': 0}, {'PRN': '009', 'DF397': 71, 'DF398': 0.677734375, 'DF399': -309, 'ExtSatInfo': 0}, {'PRN': '017', 'DF397': 76, 'DF398': 0.5302734375, 'DF399': 422, 'ExtSatInfo': 0}, {'PRN': '019', 'DF397': 78, 'DF398': 0.4326171875, 'DF399': 101, 'ExtSatInfo': 0}, {'PRN': '021', 'DF397': 79, 'DF398': 0.4169921875, 'DF399': 805, 'ExtSatInfo': 0}], [{'CELLPRN': '001', 'CELLSIG': '1C', 'DF404': -0.274, 'DF405': 0.0003269463777542114, 'DF406': 0.00029169488698244095, 'DF407': 638, 'DF408': 49.4375, 'DF420': 0}, {'CELLPRN': '001', 'CELLSIG': '1W', 'DF404': -0.274, 'DF405': 0.00032570958137512207, 'DF406': 0.00029169488698244095, 'DF407': 638, 'DF408': 52.0625, 'DF420': 0}, {'CELLPRN': '001', 'CELLSIG': '2W', 'DF404': -0.2741, 'DF405': 0.0003551114350557327, 'DF406': 0.00029748398810625076, 'DF407': 638, 'DF408': 52.0625, 'DF420': 0}, {'CELLPRN': '001', 'CELLSIG': '2L', 'DF404': -0.2722, 'DF405': 0.0003554355353116989, 'DF406': 0.00029911240562796593, 'DF407': 638, 'DF408': 45.6875, 'DF420': 0}, {'CELLPRN': '001', 'CELLSIG': '5Q', 'DF404': -0.27290000000000003, 'DF405': 0.0003531314432621002, 'DF406': 0.0002920180559158325, 'DF407': 638, 'DF408': 54.1875, 'DF420': 0}, {'CELLPRN': '002', 'CELLSIG': '1C', 'DF404': -0.1899, 'DF405': 0.00044614076614379883, 'DF406': 0.00034324172884225845, 'DF407': 646, 'DF408': 43.0, 'DF420': 0}, {'CELLPRN': '002', 'CELLSIG': '1W', 'DF404': -0.1899, 'DF405': 0.0004421919584274292, 'DF406': 0.00034324172884225845, 'DF407': 646, 'DF408': 31.3125, 'DF420': 0}, {'CELLPRN': '002', 'CELLSIG': '2W', 'DF404': -0.192, 'DF405': 0.00047398172318935394, 'DF406': 0.00029890984296798706, 'DF407': 646, 'DF408': 31.3125, 'DF420': 0}, {'CELLPRN': '003', 'CELLSIG': '1C', 'DF404': 0.41850000000000004, 'DF405': -0.00043528899550437927, 'DF406': -0.0004791910760104656, 'DF407': 635, 'DF408': 49.5, 'DF420': 0}, {'CELLPRN': '003', 'CELLSIG': '1W', 'DF404': 0.41850000000000004, 'DF405': -0.00043588317930698395, 'DF406': -0.0004791910760104656, 'DF407': 635, 'DF408': 51.9375, 'DF420': 0}, {'CELLPRN': '003', 'CELLSIG': '2W', 'DF404': 0.4178, 'DF405': -0.00040896423161029816, 'DF406': -0.000478383619338274, 'DF407': 635, 'DF408': 51.9375, 'DF420': 0}, {'CELLPRN': '003', 'CELLSIG': '2L', 'DF404': 0.40740000000000004, 'DF405': -0.0004068128764629364, 'DF406': -0.00047512631863355637, 'DF407': 635, 'DF408': 45.6875, 'DF420': 0}, {'CELLPRN': '003', 'CELLSIG': '5Q', 'DF404': 0.4188, 'DF405': -0.0004071984440088272, 'DF406': -0.00048177503049373627, 'DF407': 635, 'DF408': 53.3125, 'DF420': 0}, {'CELLPRN': '004', 'CELLSIG': '1C', 'DF404': -0.27340000000000003, 'DF405': 0.00043116696178913116, 'DF406': 0.0004361076280474663, 'DF407': 622, 'DF408': 49.0, 'DF420': 0}, {'CELLPRN': '004', 'CELLSIG': '1W', 'DF404': -0.27340000000000003, 'DF405': 0.0004300791770219803, 'DF406': 0.0004361076280474663, 'DF407': 622, 'DF408': 43.8125, 'DF420': 0}, {'CELLPRN': '004', 'CELLSIG': '2W', 'DF404': -0.2728, 'DF405': 0.0004497244954109192, 'DF406': 0.00045655621215701103, 'DF407': 622, 'DF408': 43.8125, 'DF420': 0}, {'CELLPRN': '004', 'CELLSIG': '2L', 'DF404': -0.275, 'DF405': 0.0004500187933444977, 'DF406': 0.0004695877432823181, 'DF407': 623, 'DF408': 50.0625, 'DF420': 0}, {'CELLPRN': '004', 'CELLSIG': '5Q', 'DF404': -0.2743, 'DF405': 0.00046171993017196655, 'DF406': 0.0004842812195420265, 'DF407': 623, 'DF408': 54.625, 'DF420': 0}, {'CELLPRN': '004', 'CELLSIG': '1L', 'DF404': -0.2702, 'DF405': 0.00043155625462532043, 'DF406': 0.0004513435997068882, 'DF407': 623, 'DF408': 50.5, 'DF420': 0}, {'CELLPRN': '006', 'CELLSIG': '1C', 'DF404': 0.0712, 'DF405': -0.00020522251725196838, 'DF406': -0.0001957709901034832, 'DF407': 559, 'DF408': 39.75, 'DF420': 0}, {'CELLPRN': '006', 'CELLSIG': '1W', 'DF404': 0.0712, 'DF405': -0.00020623579621315002, 'DF406': -0.0001957709901034832, 'DF407': 558, 'DF408': 35.75, 'DF420': 0}, {'CELLPRN': '006', 'CELLSIG': '2W', 'DF404': 0.0732, 'DF405': -0.00016688741743564606, 'DF406': -0.0001523960381746292, 'DF407': 558, 'DF408': 35.75, 'DF420': 0}, {'CELLPRN': '006', 'CELLSIG': '2L', 'DF404': 0.0863, 'DF405': -0.00016376934945583344, 'DF406': -0.00015482446178793907, 'DF407': 559, 'DF408': 39.5, 'DF420': 0}, {'CELLPRN': '006', 'CELLSIG': '5Q', 'DF404': 0.0383, 'DF405': -0.00015792995691299438, 'DF406': -0.00014885328710079193, 'DF407': 559, 'DF408': 44.625, 'DF420': 0}, {'CELLPRN': '007', 'CELLSIG': '1C', 'DF404': 0.06430000000000001, 'DF405': -0.0002510659396648407, 'DF406': -0.00025010714307427406, 'DF407': 391, 'DF408': 34.125, 'DF420': 0}, {'CELLPRN': '007', 'CELLSIG': '1W', 'DF404': 0.06430000000000001, 'DF405': -0.00025218352675437927, 'DF406': -0.00025010714307427406, 'DF407': 377, 'DF408': 18.625, 'DF420': 0}, {'CELLPRN': '007', 'CELLSIG': '2W', 'DF404': 0.068, 'DF405': -0.0001898389309644699, 'DF406': -0.00019579380750656128, 'DF407': 377, 'DF408': 18.625, 'DF420': 0}, {'CELLPRN': '009', 'CELLSIG': '1C', 'DF404': 0.3657, 'DF405': -0.00026627443730831146, 'DF406': -0.00024043582379817963, 'DF407': 582, 'DF408': 48.0, 'DF420': 0}, {'CELLPRN': '009', 'CELLSIG': '1W', 'DF404': 0.3657, 'DF405': -0.0002680625766515732, 'DF406': -0.00024043582379817963, 'DF407': 582, 'DF408': 50.625, 'DF420': 0}, {'CELLPRN': '009', 'CELLSIG': '2W', 'DF404': 0.366, 'DF405': -0.00024024397134780884, 'DF406': -0.00020435266196727753, 'DF407': 582, 'DF408': 50.625, 'DF420': 0}, {'CELLPRN': '009', 'CELLSIG': '2L', 'DF404': 0.3947, 'DF405': -0.00023896992206573486, 'DF406': -0.00019619334489107132, 'DF407': 584, 'DF408': 44.6875, 'DF420': 0}, {'CELLPRN': '009', 'CELLSIG': '5Q', 'DF404': 0.37670000000000003, 'DF405': -0.00023722276091575623, 'DF406': -0.00018227798864245415, 'DF407': 588, 'DF408': 52.125, 'DF420': 0}, {'CELLPRN': '017', 'CELLSIG': '1C', 'DF404': 0.4339, 'DF405': 0.00029537081718444824, 'DF406': 0.00024057738482952118, 'DF407': 619, 'DF408': 40.5625, 'DF420': 0}, {'CELLPRN': '017', 'CELLSIG': '1W', 'DF404': 0.4339, 'DF405': 0.0002936720848083496, 'DF406': 0.00024057738482952118, 'DF407': 619, 'DF408': 34.75, 'DF420': 0}, {'CELLPRN': '017', 'CELLSIG': '2W', 'DF404': 0.4335, 'DF405': 0.0003285575658082962, 'DF406': 0.00022796867415308952, 'DF407': 619, 'DF408': 34.75, 'DF420': 0}, {'CELLPRN': '017', 'CELLSIG': '2L', 'DF404': 0.454, 'DF405': 0.000330507755279541, 'DF406': 0.00023368187248706818, 'DF407': 619, 'DF408': 37.5625, 'DF420': 0}, {'CELLPRN': '019', 'CELLSIG': '1C', 'DF404': 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Thanks