RTCM Data Format (Radio Technical Commission for Maritime Services)
-
Upload
bernice-west -
Category
Documents
-
view
268 -
download
11
Transcript of RTCM Data Format (Radio Technical Commission for Maritime Services)
RINEX Raw GPS static data format for data processing and archive
NMEA Standard related to data communication between marine
electronic devices. Transmission of GPS position from GPS receiver to other
devices (e.g. GPS receiver to PDA) For real time positioning
RTCM SC-104 Transmission of GPS correction from GPS reference station
to GPS Rover For DGPS/RTK surveys
Overview of Common GPS Data Format
RTCM using in SatRef
SatRef System DGPS Single-RTK Network-RTK
All GPS corrections from SatRef are in RTCM-2.1 data format.
Radio Technical Commission for Maritime Services
Various Special Committees set the standards for International maritime radionavigation and radiocommunication
Examples:
1. GPS Applications
2. Electronic Charts…..
What is RTCM SC-104 ?
RTCM Special Committee (SC) 104 is the one concerned GPS correction signal. RTCM data format related to GPS corrections is called
RTCM SC-104 data format.
Compact binary data good for real-time processing
What is RTCM SC-104 ?
Different versions
RTCM-2.0 (Code correction ->DGPS)
RTCM-2.1 (Code + Phase correction -> RTK)
RTCM 2.2 ( …+ GLONASS )
RTCM 2.3 ( ….+ GPS Antenna Definition)
RTCM 3.0 (….+ Network RTK & GNSS)
RTCM Data Structure
Each data record contains several message types for various contents. Message 1, Message2…. Message N
Each message comprises header and body Header: message type, time, length of message, Body: data for every data type
RTCM Message TypesRTCM Message Type
Description
1 Differential GPS Corrections
2 Delta Differential GPS Corrections
3 GPS Reference Station Parameters
4 Reference Station Datum
5 GPS Constellation Health
6 GPS Null Name
7 DGPS Beacon Almanac
8 Pseudolite Almanac
9 GPS Partial Correction Set
10 P-Code Differential Correction
11 C/A Code, L1, L2 Delta Corrections
12 Pseudolite Station Parameter
13 Ground Transmitter Parameter
14 GPS Time of Week
15 Ionospheric Delay Message
RTCM Message Types
18-21 messages
added in RTCM2.1
23-24 messages
added in RTCM2.3
31-36 messages
added in RTCM2.2
16 GPS Special Message
17 GPS Ephemerides
18 RTK Uncorrected Carrier Phases
19 RTK Uncorrected Pseudorange
20 RTK Carrier Phase Corrections
21 RTK Pseudorange Corrections
22 Extended Reference Station Parameters
23 Antenna Type Defination
24 Reference Station: Antenna Reference Point (ARP) Parameter
25, 26 Undefined
27 Extended DGPS Radiobeacon Almanac
28…30 Undefined
31 Differential GLONASS Corrections
32 Differential GLONASS Reference Station
33 GLONASS Constellation Health
34 GLONASS Partial Differential Correction Set
GLONASS Null Name (N<=1)
RTCM Message Types
31-36 messages
added in RTCM2.2
35 GLONASS Radiobeacon Almanac
36 GLONASS Special Message
37 GNSS System Time Offset
38..58 Undefined
59 Proprietary Message
60..63 Multipurpose Usage
RTCM 3.0 New data structure developed for network RTK ap
plications. new signals L2C and L5 GNSS system data
• Compact Data Structure • RTCM 2.0 – 0.5 kbit / sec. (DGPS)• RTCM 2.1-2.3 requires 5 kbit / sec (DGPS+RTK)• RTCM 3.0.requires 2 kbit / sec
RTCM version 3.0
Four Groups of RTCM 3.0 GNSS RTK messages (RTCM 2004)
Group Name Message Type
Message Description
Observations 1001 L1-only GPS RTK Observables
1002 Extended L1-Only GPS RTK Observables
1003 L1 & L2 GPS RTK Observables
1004 Extended L1 & L2 GPS RTK Observables
1005 L1 Only GLONASS RTK Observables
1006 ExtendedL1-Only GLONASS RTK Observables
1007 L1 & L2 GLONASS RTK Observables
1008 Extended L1 & L2 GPS RTK Observables
Station Coordinates 1009 Stationary RTK Reference Station ARP
1010 Stationary RTK Reference ARP with Antenna Height
Antenna Description 1011 Antenna Descriptor
1012 Antenna Descriptor & Serial Number
Auxiliary Operation Information
1013 System Parameters
References RTCM Recommended Standards for Differential NAV
STAR GPS service www.navcen.uscg.gov/pubs/dgps/rctm104/Default.htm
RTCM Official Website http://www.rtcm.org/
DGPS Data Formats 2.0www.geopp.de/download/DGPS-data-formats2.pdf
Reference Station Network Information Distribution http://www.network-rtk.info/euler/euler.html