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The Accqpoint system transmits DGPS correction signals in RTCM-104 format. Last I had heard the data was transmitted over the CUE paging network; however, current advertising says they are transmitting over FM subcarrier using Radio Data System (RDS) protocols. The system requires the user to purchase a receiver and sign a service contract. The last time I checked, receiver costs were around $300. Several types of receivers are available.Home Page: http://www.inforamp.net/~pinpoint/
US Contact:
800-982-5861
714-252-9439 (fax)Canadian Contact:
800-807-7903
416-593-5324 (fax)Hong Kong Contact
011-85-2-866-6010
011-85-2-865-0063 (fax)UK Contact:
011-44-71-628-1122
011-44-71-628-6010Chinese Contact:
011-86-1-849-1411
011-86-1-849-1410 (fax)Singapore Contact:
011-65-353-7087
011-65-353-1851
The DCI system transmits DGPS correction signals over FM broadcast station subcarriers using Radio Data System (RDS) protocols. The system requires the operator to purchase a receiver and sign a service contract. Last time I checked, receiver costs were around $300. Several levels of service are available.Home Page: http://www.dgps.com/
Posted in an ad in GPS World magazine, I have not been able to confirm this link. - jtbUS Contact:
DCI
10121 Miller Ave
Cupertino, CA 95014408-446-8350 or 800-446-0015
408-446-8383European Contact:
44-428-661229
44-428-642187 (fax)Sweden Contact: TERACOM Svensk Rundradio AB
Peter Ericson
Skeppsbrogatan 6,1,tr
971 27 Lulea, Sweden46-920-239500
The Omnistar system supplies the user with DGPS corrections in RTCM 104 format. The user receives correction signals from a commercial geostationary satellite. The system is fed by a set of 10 differential stations set around the continental U.S. The system requires the operator to purchase a satellite receiver and sign a service contract. This system differs from the others in that the corrections are available across the entire United States and much of Canada and Mexico. I believe that additional international services are also available but I do not know this for a fact.Omnistar Model 6300A Receiver, with one year's Subscription - $8,000
Omnistar Model 6300A Receiver, with three year's Subscription - $10,800
Internal Motorola 8 ch GPS engine - $1500.00.Home Page: http://www.omnistar.com/
Contact:
Max Huff, General Manager
John E. Chance & Associates
8200 Westglen
Houston, TX 77063
dgps@omnistar.com713-785-5850
713-785-5164 (fax)
Rapid Map Australia is one of the distributors for the Omnistar service downunder. RMA works through Fugro Survey in West Australia who are affilitated with JECA. For more information contact Phil Lack at:email: plack@ozonline.com.au
Technology Enterprise Centre
Suite 3, 2 Park Drive.
Bundoora. VIC.3083
AUSTRALIAPhone:
61-3-9455 1699
61-3-9455 1990 (fax)
VERIPOS is a hf based DGPS service in NW Europe. VERIPOSi is a DGPS service delivered by Intelsat also used in NW Europe.VERIPOS
c/o Tony Leary
Subsea Survey
Greenwell Base
Greenwell Road
Aberdeen
AB1 4AX+44 1224 292230/8
Email: tony.leary@subseaoffshore.gb.sprint.com
Dave Fowler at Starlink, Inc is doing a fine job of tracking international DGPS systems. Until I have a stable information source for them, I'm not going to track them.
Information on the Coast Guard DGPS Marine Radiobeacon program is available from the USCG Navigation Center (NAVCEN) at:http://www.navcen.uscg.mil/dgps/dgps.htm
Downloaded from the USGS GPSIC, 3/95The FAA is considering three types of differential GPS service for aviation use: (1) local area DGPS (LADGPS), which would be located at each airport or closely grouped airports to support instrument approaches to current CAT I weather minimums; (2) wide area DGPS (WADGPS), which would provide GPS integrity broadcast (GIB) and accuracy improvements for all of North America; and (3) use of kinematic carrier phase positioning for instrument approach and landing.
All three types of DGPS service are still under develoment; however, WADGPS/GIB is in the FAA budget for procurement and installation. The basic concept for WADGPS/GIB is to have several GPS ground monitoring stations (about 20 for North America) with two master control stations where differential corrections and integrity for each satellite are determined. This information will be sent to two communications satellite earth stations and relayed to the aircraft via a satellite signal that is similar to a GPS signal with unique codes. This signal may also be suitable for ranging providing improved navigation availability.
FAA Technical Studies
A substantial amount of technical information on the FAA's DGPS program, including Wide Area Augmentation System (WAAS) and Receiver Autonomous Integrity Monitoring (RAIM) is available from the Center for Advanced Aviation System Development (CAASD). CAASD is a Federal Aviation Administration (FAA)-sponsored Federally Funded Research and Development Center (FFRDC) operated by The MITRE Corporation, a not-for-profit system engineering organization chartered in the public interest.The MITRE Corporation also operates the Global Positioning System Laboratory which is tied into CAASD somehow. I'm not sure how yet.
MIT's Lincoln Laboratory also runs FAA-sponsored studies involving the WAAS and combining NAVSTAR - GLONASS receivers for aviation use.
The CPRS is part of the Colorado Plateau Information Network.Home Page: http://www.nbs.nau.edu/
The Center for Advanced Spatial Technologies maintains a publicly accessable base station.
