§ 006. Convert Hatanaka Compressed CRX to RINEX

Use-case

We have Hatanaka Compressed RINEX file. It is very common format for observables storing on servers especially public CORS networks. It allows to shrinks RIENX a lot a save disk space. However, not all PPK software and utilities support CRX format. Sometimes it is needed to be converted to standard (uncompressed) RINEX.

Convert Compact RINEX (CRX) to RINEX4

CRX file to be used in the example is downloaded from BKG Data & Products Repository. For instance, let it be file ABPO00MDG_R_20240440000_01D_30S_MO.crx

Download GZ archive on your PC and unpack it. In result, we should have in hands file ABPO00MDG_R_20240440000_01D_30S_MO.crx of CRX format. It is not human readable (except header). Epoch data are packed in specific form.

RTools online service will be used for converting CRX to RINEX. Choose Modify RINEX file option at first step of processing Wizard. Than press Next button.

Next specify CRX file to be converted and edited (modified). You could select RINEX version to be converted to as well as filter GNSS, do data decimation etc.

File uploading and processing starts. It may take some time, please wait. Result RINEX file is ZIPped on server side and automatically downloaded once ready. If it is unzipped, we may see RINEX observation file w/ name abpo0440.24o.

      4.01           OBSERVATION DATA    MIXED               RINEX VERSION / TYPE
RTOOLS              KernelSAT           20240215 124629 UTC PGM / RUN BY / DATE
KernelSAT Rinex Tools                                       COMMENT
sbf2rin-15.6.1                          20240214 001250 UTC PGM / RUN BY / DATE
Input file: ABPO00MDG_R_20240440000_01D_30S_MO.crx          COMMENT
                                                            COMMENT
GGN                 JPL                                     OBSERVER / AGENCY
3013358             SEPT_POLARX5        5.5.0               REC # / TYPE / VERS
CR6200342009        ASH701945G_M    SCIT                    ANT # / TYPE
        0.0083        0.0000        0.0000                  ANTENNA: DELTA H/E/N
ABPO                                                        MARKER NAME
33302M001                                                   MARKER NUMBER
  4097216.5539  4429119.1897 -2065771.1988                  APPROX POSITION XYZ
  2024     2    13     0     0    0.0000000     GPS         TIME OF FIRST OBS
  2024     2    13    23    59   30.0000000     GPS         TIME OF LAST OBS
    30.000                                                  INTERVAL
RTools: Total 1 file(s) processed                           COMMENT
G   17 C1C L1C S1C C1W S1W C2W L2W S2W C2L L2L S2L C5Q L5Q  SYS / # / OBS TYPES
       S5Q C1L L1L S1L                                      SYS / # / OBS TYPES
R   12 C1C L1C S1C C1P L1P S1P C2P L2P S2P C2C L2C S2C      SYS / # / OBS TYPES
E   15 C1C L1C S1C C5Q L5Q S5Q C7Q L7Q S7Q C8Q L8Q S8Q C6C  SYS / # / OBS TYPES
       L6C S6C                                              SYS / # / OBS TYPES
J   12 C1C L1C S1C C2L L2L S2L C5Q L5Q S5Q C1L L1L S1L      SYS / # / OBS TYPES
C   18 C2I L2I S2I C7I L7I S7I C6I L6I S6I C1P L1P S1P C5P  SYS / # / OBS TYPES
       L5P S5P C7D L7D S7D                                  SYS / # / OBS TYPES
   133                                                      # OF SATELLITES
   G01   938   937   938   936   936   936   936   936   937PRN / # OF OBS
         937   937   936   936   936     0     0     0      PRN / # OF OBS
   G02   921   914   921   914   914   914   914   914     0PRN / # OF OBS
           0     0     0     0     0     0     0     0      PRN / # OF OBS
   G03   745   729   745   728   728   728   728   728   744PRN / # OF OBS
         731   744   699   683   699     0     0     0      PRN / # OF OBS
   G04  1270  1173  1270  1168  1168  1168  1168  1168  1390PRN / # OF OBS
   
........

RINEX file statistic

If one would like to get statistic about RINEX or any other type of file, WAY online service could be used. If converted file is uploaded into WAY, we may get idea about receiver location, available GNSS, Satellites and signals.

Summary

Now we know how to convert Hatanaka compressed RINEX (CRX) to standard RINEX w/ help of KernelSat RINEX Tools (RTools) online service. Also, statistic with information about receiver, its location and available measurements may be generated by WAY service.