Swarm Product Data Handbook

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SW_GPSx_RN_1B

Full product name
GPS RINEX Navigation data

Description

The GPSx_RN_1B Products contain the GPS Navigation files generated from GPSR data. The product stores the GPS Navigation message file in the RINEX 3.00 format generally used for LEO satellites.

The description of the format can be found in rinex300.pdf, Section 2 and Appendix A.

Data Access

Details

The tables reported below are extracted from the Appendix A of rinex300.pdf and describe the content of the RINEX Product file.
TABLE A4
GNSS NAVIGATION MESSAGE FILE - HEADER SECTION DESCRIPTION
HEADER LABEL
(Columns 61-80)		 DESCRIPTION FORMAT
RINEX VERSION / TYPE

- Format version: 3.00
- File type ('N' for navigation data)
- Satellite System: G: GPS
                                R: GLONASS
                                E: Galileo
                                S: SBAS Payload
                                M: Mixed

F9.2,11X,
A1,19X,
A1,19X
PGM / RUN BY / DATE 

- Name of program creating current file
- Name of agency creating current file 
- Date and time of file creation       
   Format: yyyymmdd hhmmss zone         
   zone: 3-4 char. code for time zone. 
         'UTC ' recommended!           
         'LCL ' if local time with un- 
           known local time system code

 A20,
 A20,
     
 A20 
*COMMENT

Comment line(s)

A60
*IONOSPHERIC CORR  Ionospheric correction parameters      
 - Correction type                     
     GAL = Galileo ai0 – ai2           
     GPSA = GPS alpha0 - alpha3        
     GPSB = GPS beta0 - beta3          
 - Parameters                          
     GPS: alpha0-alpha3 or beta0-beta3 
     GAL: ai0, ai1, ai2, zero          
 		         
 A4,1X, 
        
        
        
 4D12.4 
        
 
*TIME SYSTEM CORR

Corrections to transform the system time
to UTC or other time systems            
- Correction type                       
   GAUT = GAL to UTC a0, a1             
   GPUT = GPS to UTC a0, a1             
   SBUT = SBAS to UTC a0, a1            
   GLUT = GLO to UTC a0=TauC, a1=zero   
   GPGA = GPS to GAL a0=A0G, a1=A1G     
   GLGP = GLO to GPS a0=TauGPS, a1=zero 
- a0,a1 Coefficients of 1-deg polynomial
        (a0 sec, a1 sec/sec)            
        CORR(s) = a0 + a1*DELTAT        
- T Reference time for polynomial       
    (Seconds into GPS/GAL week)         
- W Reference week number               
    (GPS/GAL week, continuous number)   
  T and W zero for GLONASS.             
- S EGNOS, WAAS, or MSAS ...            
    (left-justified)                    
    Derived from MT17 service provider. 
    If not known: Use Snn with          
      nn = PRN-100 of satellite         
           broadcasting the MT12        
- U UTC Identifier (0 if unknown)       
    1=UTC(NIST), 2=UTC(USNO), 3=UTC(SU),
    4=UTC(BIPM), 5=UTC(Europe Lab),     
    6=UTC(CRL), >6 = not assigned yet   
  S and U for SBAS only.                

 

A4,1X,
          
          
          
          
                    
   

D17.10,
   D16.9,
          
       I7,
          
       I5,
          
          
 1X,A5,1X 
          
          
          
          
          
    I2,1X 
          
  
*LEAP SECONDS 

Number of leap seconds since 6-Jan-1980 as transmitted by the GPS almanac.     

I6
END OF HEADER

Last record in the header section.  

60X

Records marked with * are optional

 

TABLE A5
GNSS NAVIGATION MESSAGE FILE – GPS DATA RECORD DESCRIPTION
OBS. RECORD DESCRIPTION FORMAT
SV / EPOCH / SV CLK

 - Satellite system (G), sat number (PRN)
 - Epoch: Toc - Time of Clock       (GPS)
    - year (4 digits)                    
    - month,day,hour,minute,second       
 - SV clock bias (seconds)               
 - SV clock drift (sec/sec)              
 - SV clock drift rate (sec/sec2)        

  A1,I2.2, 
           
    1X,I4, 
5(1X,I2.2),
   3D19.12 
           
     *)    
BROADCAST ORBIT - 1  - IODE Issue of Data, Ephemeris     
 - Crs                  (meters)     
 - Delta n            (radians/sec)
 - M0                   (radians)    

4X,4D19.12
          
    ***)  
          
BROADCAST ORBIT - 2

 - Cuc                  (radians) 
 - e Eccentricity                 
 - Cus                  (radians) 
 - sqrt(A)             (sqrt(m)) 

4X,4D19.12
BROADCAST ORBIT - 3

 - Toe Time of Ephemeris (sec of GPS week)
 - Cic                  (radians)         
 - OMEGA0       (radians)         
 - Cis                  (radians)         

4X,4D19.12
BROADCAST ORBIT - 4

 - i0                   (radians)    
 - Crc                 (meters)     
 - omega           (radians)    
 - OMEGA DOT   (radians/sec)

4X,4D19.12
BROADCAST ORBIT - 5

 - IDOT                 (radians/sec)
 - Codes on L2 channel               
 - GPS Week # (to go with TOE)       
   Continuous number, not mod(1024)! 
 - L2 P data flag                    

4X,4D19.12
BROADCAST ORBIT - 6

 - SV accuracy          (meters)          
 - SV health         (bits 17-22 w 3 sf 1)
 - TGD                  (seconds)         
 - IODC Issue of Data, Clock              

4X,4D19.12
BROADCAST ORBIT - 7

 - Transmission time of message       **)
 (sec of GPS week, derived e.g.          
 from Z-count in Hand Over Word (HOW)    
 - Fit interval (hours)                  
 (see ICD-GPS-200, 20.3.4.4)             
 Zero if not known                       
 - spare                                 
 - spare                                 

4X,4D19.12

**) Adjust the Transmission time of message by + or - 604800 to refer to the reported week in BROADCAST ORBIT - 5, if necessary. Set value to 0.9999E9 if not known.

Related resources

Level 1B Product Descriptions:

RINEX format Description