RTK SERVICE

The OGS RTK service, which disseminates differential correction (phase and code), permits, adopting GPS&GLONASS technology, a positioning with a centimetrical precision in the Friuli Venezia Giulia area. The whole system is constituted by few permanent GPS receivers FReDNet and a process and distribuition server (caster).
The data are available through a generic, stateless application-level protocol: NTRIP (Networked Transport of RTCM via Internet Protocol) and the service, managed by the Centro di Ricerche Sismologiche - CRS, is free.
The NTRIP Caster addresses are the following:

AddressUsernamePasswordNotes
158.110.30.81:2110GeoGeo The following mountpoints are available:
  • Rete Frednet single station;
  • Rete A. Marussi single station Rete ;
  • Rete Frednet network solution:
    •     - NEAREST;
        - FKP;
        - MAC;
        - VR3;
        - VRC;
        - VRS;
    158.110.30.81:2111GeoGeo The following mountpoints are available:
  • Rete Frednet network solution:
    •     - NEAREST;
        - FKP;
        - MAC;
        - VR3;
        - VRC;
        - VRS;

    The service access ways to the real time positioning are the following:

    SERVICEDESCRIPTION
    SINGLE STATION The rover receives differential corrections from the single station (master) selected by the user. In this case, the server redirect data from the master station to the rover. More then one rover can access at the same time at the same master. In this case, the server increase data flow as many as the number of requests.
    The comunication form server to rover is monodirectional.
    NEAREST The working mode is the same of the 'single station' mode. In this case, the user doesn't need to know the master station for connecting. The caster will distribute automatically the differential correction from the nearest permanent station. Adopting this mode, the server need the rover approximate position.
    The communication server-rover is bidirectional.
    VRS The rover receive differential corrections from a Virtual Reference Station (VRS). The caster, using data coming from all the station of the network and the approximate rover position, calculates a 'network solution' which create a VRS near the rover (few km). The rover must send his approximate coordinates (NMEA format) to the server;
    the communication server-rover is bidirectional.
    * MAC,VR3,VRC For users who adopts the RTCM 3.0 and RTCM 3.1 protocols are available the new functions MAC(RTCM 3.1) and VR3(RTCM 3.0). These functions are suggested using Leica instruments.
    There is also available solution VRS for users who want to use CMR protocol (kind of compressed RTCM protocol).
    FKP The software generate a network solution calculated using an average parameters correction calculated with a interpolation of the surrounding stations.
    The communication server-rover is bidirectional.

    The OGS caster further to the convention with Regione Friuli Venezia Giulia, disseminates also the single station differential correction of 'Rete A. Marussi' .
    All the real time services are distribuited respect to the new reference system ETRF2000(2008.0) scheme by Istituto Geografico Militare (IGM) to set of Rete Dinamica Nazionale (RDN).
    This system (ETRF2000(2008.0)) will be early adopted also in the services distribuited by 'Rete A.Marussi' which now use the reference system ETRF89.
    The user who connects his receiver to the caster has at his disposal several access points called mountpoint.
    The name 'mountpoint' identify:
    • the owner of the service (OGS or RAFVG)
    • the access service:
      • from single station if the name contain the name of the GPS station;
      • NEAR means from the GPS station nearest to the receiver;
      • VRS or FKP for network solutions;

    EXAMPLES
    OGS_JOANThe rover establish a connection in 'single station' modality with the OGS permanent site of JOAN.
    OGS_NEAThe rover establish a connection in 'single station' modality to the nearest OGS permanent site
    OGS_FKPThe rover establish a connection in FKP modality to the FReDNet Network
    OGS_VRSThe rover establish a connection in VRS modality to the FReDNet Network
    RAFVG_BARCThe rover establish a connection in 'single station' modality with the Regione Friuli Venezia Giulia permanent site of BARC.


    Following the 'mountpoints' from the 158.110.30.81:2110:

    158.110.30.81:2110 - mappa
    OGS Ntrip Source Table

    Active Streams
    Caster Mountpoint Identifier Format Format Details Carrier Phase GNSS Network Country Position NMEA Solution Generator Compr. Auth Fee Bit rate
    2110 OGS_ACOM OGS_ACOM RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 46.55°N 13.51°E N Single base GNSMART none Y(B) N 10400
    2110 OGS_AFAL OGS_AFAL RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 46.53°N 12.17°E N Single base GNSMART none Y(B) N 10400
    2110 OGS_CANV OGS_CANV RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 46.01°N 12.44°E N Single base GNSMART none Y(B) N 10400
    2110 OGS_CODR OGS_CODR RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 45.96°N 12.98°E N Single base GNSMART none Y(B) N 10400
    2110 OGS_FUSE OGS_FUSE RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 46.41°N 13.00°E N Single base GNSMART none Y(B) N 10400
    2110 OGS_JOAN OGS_JOAN RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 46.18°N 13.42°E N Single base GNSMART none Y(B) N 10400
    2110 OGS_MDEA OGS_MDEA RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 45.92°N 13.44°E N Single base GNSMART none Y(B) N 10400
    2110 OGS_MPRA OGS_MPRA RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 46.24°N 12.99°E N Single base GNSMART none Y(B) N 10400
    2110 OGS_NOVE OGS_NOVE RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 45.67°N 12.59°E N Single base GNSMART none Y(B) N 10400
    2110 OGS_PAZO OGS_PAZO RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 45.81°N 13.05°E N Single base GNSMART none Y(B) N 10400
    2110 OGS_SUSE OGS_SUSE RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 45.86°N 12.21°E N Single base GNSMART none Y(B) N 10400
    2110 OGS_TRIE OGS_TRIE RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 45.71°N 13.76°E N Single base GNSMART none Y(B) N 10400
    2110 OGS_UDI1 OGS_UDI1 RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 46.04°N 13.25°E N Single base GNSMART none Y(B) N 10400
    2110 OGS_VARM OGS_VARM RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 46.46°N 12.56°E N Single base GNSMART none Y(B) N 10400
    2110 OGS_ZOUF OGS_ZOUF RTCM 2.3 1(1), 2(1), 3(60), 14(31), 18(1), 19(1), 22(17) L2 GPS+GLO FReDNet ITA 46.56°N 12.97°E N Single base GNSMART none Y(B) N 10400
    2110 OGS__FKP OGS__FKP RTCM 2.3 1(1), 2(1), 3(60), 18(1), 19(1), 14(31), 22(17) L2 GPS+GLO FReDNet ITA   Y Network GNSMART N Y(B) N 10400
    2110 OGS__MAC OGS__MAC RTCM 3.1 1004(1), 1012(1), 1006(17), 1008(31), 1014(10), 1017(10), 1039(10) L2 GPS+GLO FReDNet ITA   Y Network GNSMART N Y(B) N 10400
    2110 OGS__NEA OGS__NEA RTCM 2.3 1(1), 2(1), 3(60), 18(1), 19(1), 14(31), 22(17) L2 GPS+GLO FReDNet ITA   Y Single base GNSMART N Y(B) N 10400
    2110 OGS__VR3 OGS__VR3 RTCM 3.0 1003, 1005(17), 1007(21), 1011, 1013(37) L2 GPS+GLO FReDNet ITA   Y Network GNSMART N Y(B) N 10400
    2110 OGS__VRC OGS__VRC CMR 0(1), 1(30), 3(1) L2 GPS+GLO FReDNet ITA   Y Network GNSMART N Y(B) N 10400
    2110 OGS__VRS OGS__VRS RTCM 2.3 1(1), 2(1), 3(60), 18(1), 19(1) L2 GPS+GLO FReDNet ITA   Y Network GNSMART N Y(B) N 10400
    2110 RAFVG_AMPE RAFVG_AMPE RTCM 2.3 1(1), 3(10), 18(1), 19(1) L2 GPS MARUSSI ITA 46.41°N 12.80°E N Single base Trimble GPSNet N Y(B) N 5600
    2110 RAFVG_BARC RAFVG_BARC RTCM 2.3 1(1), 3(10), 18(1), 19(1) L2 GPS MARUSSI ITA 46.19°N 12.56°E N Single base Trimble GPSNet N Y(B) N 5600
    2110 RAFVG_BEVA RAFVG_BEVA RTCM 2.3 1(1), 3(10), 18(1), 19(1) L2 GPS MARUSSI ITA 45.67°N 13.07°E N Single base Trimble GPSNet N Y(B) N 5600
    2110 RAFVG_GORI RAFVG_GORI RTCM 2.3 1(1), 3(10), 18(1), 19(1) L2 GPS MARUSSI ITA 45.94°N 13.62°E N Single base Trimble GPSNet N Y(B) N 5600
    2110 RAFVG_MOGG RAFVG_MOGG RTCM 2.3 1(1), 3(10), 18(1), 19(1) L2 GPS MARUSSI ITA 46.41°N 13.20°E N Single base Trimble GPSNet N Y(B) N 5600
    2110 RAFVG_PALM RAFVG_PALM RTCM 2.3 1(1), 3(10), 18(1), 19(1) L2 GPS MARUSSI ITA 45.90°N 13.31°E N Single base Trimble GPSNet N Y(B) N 5600
    2110 RAFVG_PORD RAFVG_PORD RTCM 2.3 1(1), 3(10), 18(1), 19(1) L2 GPS MARUSSI ITA 45.96°N 12.66°E N Single base Trimble GPSNet N Y(B) N 5600
    2110 RAFVG_TARV RAFVG_TARV RTCM 2.3 1(1), 3(10), 18(1), 19(1) L2 GPS MARUSSI ITA 46.50°N 13.59°E N Single base Trimble GPSNet N Y(B) N 5600
    2110 RAFVG_TRIE RAFVG_TRIE RTCM 2.3 1(1), 3(10), 18(1), 19(1) L2 GPS MARUSSI ITA 45.66°N 13.79°E N Single base Trimble GPSNet N Y(B) N 5600
    2110 RAFVG_UDIN RAFVG_UDIN RTCM 2.3 1(1), 3(10), 18(1), 19(1) L2 GPS MARUSSI ITA 45.66°N 13.79°E N Single base Trimble GPSNet N Y(B) N 5600

    Number of entries: 31

    Last update: 2013-05-20 00:10:10 (UTC)

    158.110.30.81:2111 - mappa
    OGS Ntrip Source Table

    Active Streams
    Caster Mountpoint Identifier Format Format Details Carrier Phase GNSS Network Country Position NMEA Solution Generator Compr. Auth Fee Bit rate
    2111 OGS__FKP OGS__FKP RTCM 2.3 1(1), 2(1), 3(60), 18(1), 19(1), 14(31), 22(17) L2 GPS+GLO FReDNet ITA   Y Network GNSMART N Y(B) N 10400
    2111 OGS__MAC OGS__MAC RTCM 3.1 1004(1), 1012(1), 1006(17), 1008(31), 1014(10), 1017(10), 1039(10) L2 GPS+GLO FReDNet ITA   Y Network GNSMART N Y(B) N 10400
    2111 OGS__NEA OGS__NEA RTCM 2.3 1(1), 2(1), 3(60), 18(1), 19(1), 14(31), 22(17) L2 GPS+GLO FReDNet ITA   Y Single base GNSMART N Y(B) N 10400
    2111 OGS__VR3 OGS__VR3 RTCM 3.0 1003, 1005(17), 1007(21), 1011, 1013(37) L2 GPS+GLO FReDNet ITA   Y Network GNSMART N Y(B) N 10400
    2111 OGS__VRC OGS__VRC CMR 0(1), 1(30), 3(1) L2 GPS+GLO FReDNet ITA   Y Network GNSMART N Y(B) N 10400
    2111 OGS__VRS OGS__VRS RTCM 2.3 1(1), 2(1), 3(60), 18(1), 19(1) L2 GPS+GLO FReDNet ITA   Y Network GNSMART N Y(B) N 10400

    Number of entries: 6

    Last update: 2013-05-20 00:10:10 (UTC)



    NTRIP
    To broadcast differential corrections is used the protocol RTCM (    Radio Technical Commission for Maritime Services). The RTCM contains informations classifieds as TYPES. The RTCM can?t support modern service because doesn?t permits the contemporary access to more then one receiver to the same master. The RTCM data (differential correction) are broadcast through NTRIP protocol based on HTTP (Hyper Text Transfer Protocol). Ntrip is implemented in three system software components: NtripClients, NtripServers and NtripCasters. The NtripCaster is the actual HTTP server program whereas NtripClient and NtripServer are acting as HTTP clients.


    TYPES
    TYPE 1 Differential correction for all visible satellites.
    TYPE 3 Reference station parameters.
    TYPE 9 Differential correction for a certain number of visible satellites.
    TYPE 16 Text message.
    TYPE 18 Phase values with errors.
    TYPE 19 Pseudorange value with errors.

    INFORMATIONS
    NTRIP igs.ifag.de
    RTCM rtcm.org
    Coordinates trasformation link
    UTILITY (Ntrip Clients)
    GNSS Internt Radio
    Windows
    Linux
    Ntripper Ntripper