Customer Service Center

• GSS6400
      - GPS only model; minimum requirements =  Firmware v3.00 and FPGA v54 and FIFO v58
      - GPS/GLO model; minimum requirements = Firmware v3.00 and FPGA v54 and FIFO v56
      - GPS/GLO/GAL model; minimum requirements = Firmware v3.32 and FPGA v65 and FIFO v66h

1. The basic file structure is as follows:-
   
   

   BYTE ORDER ON DISK (Big Endian)
   1	2	3	4
   32 bit word
   31			0

   
    
2. Data stored in Big Endian format
    
3. The most significant bit of each byte is the earliest time sample in that byte  
    
4. When reading data off the disk there is a byte reversal.
       - To get the format above swap bytes 4 and 1, 3 and 2
    

5. Files are stored as 'Sign' and 'Magnitude' (Mag) - see table structures below

6. The data format depends on the file format, as follows.

GPS Only = .dat or .dgp files

GPS (2bit) + GLONASS (1bit) = .dgg files

GLONASS Only = .dgl files

Galileo Only = .dga files