NTrip Corrections via CORS Network for TeeJet Technologies RX-600RTK Evaluation of Potential Locations

 
NTrip Corrections via CORS Network for TeeJet Technologies RX-600RTK Evaluation of Potential Locations
NTrip Corrections via CORS Network for
TeeJet Technologies RX-600RTK
Evaluation of Potential Locations
This document describes the steps that can be taken to evaluate whether or not NTrip type RTK corrections delivered via
cellular modem from a CORS network are available in any given US location. Due to the inherently in-accurate nature of
defining cellular coverage areas the results of following this evaluation should be considered indicative only, and does not
constitute a guarantee of successful operation of the system.

An on-ground test in the actual location will provide confirmation of the suitability of CORS as a viable RTK correction option
for the RX-600RTK system. If a preliminary evaluation suggests that CORS will work, a limited time no-charge Data Plan
and console Activation can possibly be arranged with TeeJet Technologies in order to test a system at the target location.

CORS network compatibility is an integral part of the RX-600RTK system. The hardware needed to connect to the network
is built into the RX-600RTK, and TeeJet offers a complete solution for CORS network operations including the cellular Data
Plan. This high level of integration means that the user does not have to piece together the hardware nor invest time and
money in negotiating connectivity to the cellular network.

Please note the following important considerations:
• Some CORS networks are sponsored by State agencies who typically don’t charge for accessing the service, while
    other CORS networks are privately owned and will require the user pay a fee to access the network. This document
    should help you identify these factors before committing to the CORS option for the RX-600RTK system.
• The formation and access to CORS networks changes on a very regular basis. Please contact TeeJet Technologies or
    navigate to the following webpage to be sure that you are referencing the very latest version of this document and sup-
    porting material

    http://www.teejet.com/english/home/products/precision-farming-products/gps-receivers-and-accessories/rx-600rtk.aspx

•   TeeJet Technologies makes no claims as to the accuracy of the material contained in this document. If you find CORS
    network contact or status information in this document that is incorrect or has changed, please contact TeeJet Customer
    Service and advise us of the discrepancy so we can keep this resource up-to-date.
•   Please keep in mind that some CORS networks used in the Survey market are used for the post-processing of GPS
    data, and as such are not suitable for use in a unit like the RX-600RTK that requires real-time correction data. See
    below for details on compatible networks.
•   As a general rule-of-thumb you can expect to receive acceptable accuracy up to 10 miles outside of the network, but
    please be sure to test and verify to your own satisfaction.

    WARNING: Accessing NTRIP data via cell modem is possible almost anywhere you have cell phone coverage, but
    RTK level accuracy will only be achieved if the unit is within ~ 10 miles of the network being referenced.

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Compatible NTrip/CORS networks

The RX-600RTK system can only operate on networks that stream the following data formats:
•      CMR
•      CMR+
•      RTCM 3.0

Please note that the GLONASS option on the RX-600RTK is only supported on networks streaming RTCM 3.0

Summary of the evaluation process

1.       Determine if the target location is covered by a CORS network and if the subscription fees (if any) are acceptable
2.       Determine if the target location is covered by a suitable cellular data network (to transport the NTrip correction data
         to the rover.)
3.       Determine the process involved in logging onto the NTrip server.

Note:    It is necessary to ensure you have both a CORS network available and cellular data coverage, in order for CORS
         based RTK corrections to work on the RX-600RTK.

Procedure

1.       Determine if the target location is covered by a CORS network

  a.                Call, or look up the website listed below to see if the target location is covered by a CORS network and
		                  confirm that the subscription fee (if any) is acceptable.

 State    Operator            URL                                   Data Streams        Cost        Notes
                                                                     CMR   CMR   RTCM
                                                                            +     3.0
 AR       Laser Specialists   http://www.laserspecialistsinc.com/   √      √     √      $3000/yr    Single station in NW Arkansas. See website for details
                              gpsnetworks.htm                                           $250/mth

 IA       IA DOT              www.iowadot.gov/rtn/                  √      √     √      No charge   State wide coverage. Planned to be operational 1/2/09
 IL       Midwest RTK         http://www.mwrtk.net/default.asp                          $2000/yr    SW Illinois
          Networks                                                                      $250/mth
 IN       Midwest RTK         http://www.mwrtk.net/default.asp                          $2000/yr    Broad section through center of state
          Networks                                                                      $250/mth
 KS       City of Wichita                                           √      √     √      No charge   Sedgwick County/Wichita only. See Appendix A for contact
                                                                                                    information

          Laser Specialists   http://www.laserspecialistsinc.com/   √      √     √      $3000/yr    Coverage in Kansas City, Topeka, Emporia, Wichita, &
                              gpsnetworks.htm                                           $250/mth    Junction City. See website for details

98-01281 R0                                                         www.teejet.com                                                               Page 2
State     Operator            URL                                     Data Streams         Cost        Notes
                                                                           CMR   CMR   RTCM
                                                                                  +     3.0
    MI        MI DOT              http://www.mdotcors.org/                             √       No charge   Complete agreement and mail hard copy to MI DOT:
                                                                                                           http://www.mdotcors.org/data_out/log_files/MDOT_RTK_
                                                                                                           ACCESS.pdf
                                                                                                           The website is not current in regards to the availability of
                                                                                                           RTCM v3.0
    MN        MN DOT              http://www.olmweb.dot.state.mn.us/        √     √        √   No charge   Extensive coverage as detailed in this map: http://www.
                                  CORS.GPS/cors.html                                                       olmweb.dot.state.mn.us/CORS.GPS/cors_map.pdf
    MO        Laser Specialists   http://www.laserspecialistsinc.com/       √     √        √   $3000/yr    Kansas City area only
                                  gpsnetworks.htm                                              $250/mth
              Midwest RTK         http://www.mwrtk.net/default.asp                             $2000/yr    Greater St. Louis area including SW IL
              Networks                                                                         $250/mth
    NE        Metro Area Refer-                                             √     √        √   $1200/yr    See Appendix A for coverage map & contact information
              ence Network
    OH        OH DOT              http://www.dot.state.oh.us/Divisions/     √     √        √   No charge   Statewide coverage. See Appendix A for contact informa-
                                  ProdMgt/Aerial/Pages/VRSRTK.                                             tion.
                                  aspx

2. Determine if the target location is covered by a suitable cellular data network that can relay the NTrip correction data to
   the rover.

            To view the coverage map of the CDMA provider used by the RX-600RTK, go to www.aeris.net , move your mouse

         over the image                            and then click on ‘Aeris’s CDMA coverage’                                       .

Please see the following map for an example.

•        The dark green areas are where 2 or more compatible cellular carriers are present, and data coverage should be
         good.
•        The light green areas are where there is a single compatible cellular carrier present, and the system should still
         work fine.
•        The white areas have no cellular coverage and most likely will not support corrections from any CORS network that
         may cover that area.

98-01281 R0                                                               www.teejet.com                                                                   Page 3
3.      Determine the process involved in logging onto the NTrip server.

  a.            Contact the Network Administrator via phone or website as recommended in this document to obtain logon
		              credentials including:
		              i.      Host/Server IP address
		              ii.     Host/Server Port
		              iii.    Username
		              iv.     Password

In the case of CORS networks sponsored by State or local government agencies at no charge; this utility is being provided
as a public service and does not include any support from the sponsoring agency whatsoever. Please keep this in mind
when requesting log-on credentials for the network, and only contact the agency by the method indicated in this document.

Please refer to TeeJet Technical Bulletin 98-01270 for complete details on correctly provisioning an RX-600RTK system for
operation on a CORS network, entering the log-on credentials into the RX-600RTK console, and operating on the CORS
network.

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Appendix A                    Additional Network contact information

Following is contact information for network providers that do not offer credentials via their website and instead require you
to contact them by phone or email. When you contact them by email please use the following subject line:

Subject: Logon credentials for CORS/VRS Network.

In the body of the message please provide all the following information:

•           Name
            o        First name
            o        Last name
•           Address
            o        Street address
            o        City
            o        State
            o        Zip
•           Phone
            o        Work/home phone
            o        Cell phone
•           E-mail address
•           Number or rovers to be connected to network
•           Receiver type: 		       TeeJet
•           Cellular provider:      Aeris

    State      Network                 Contact Name                  Email                              Phone
    OH         Ohio DOT                David Beiter                  dave.beiter@dot.state.oh.us        Email Only
    KS         Sedgwick Co.            Scott Lindebak                SLindebak@wichita.gov              Email Only
    MN         MN DOT                  Bud Jorgenson or Don Seitz    bud.jorgenson@dot.state.mn.us or   Email Only
                                                                     don.seitz@dot.state.mn.us

98-01281 R0                                                www.teejet.com                                            Page 5
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