dataformats.txt

OpenGPSSim是一个gps模拟程序

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parameter files ('./bin/xmit_par.dat' & './bin/rcvr_par.dat'):

  ASCII format
  
  structure is <key> : <value>; 
  lines starting with '#' are ignored (comments)
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downsampled raw data ('./data/ogsraw.dat')

  binary format

  4 samples per byte; MSB preceeds LSB (e.g. the bit 
  pattern 01110010 translates to samples 01, 11, 00, 10); 
  mapping is: 00 -> -3, 01 -> -1, 10 -> 1, 11 -> 3.
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navigation data ('./data/nav-out-PRN', PRN=1,...,32)

  binary format 
  
  stream of 1500 bytes with values -1, 1
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in-phase and quad-phase data ('./data/iq-out-PRN', PRN=1,...,32)

  binary format
  
  stream of signed long words (32 bit), alternating I and Q values
  (I.e.: ...,I(k-1),Q(k-1),I(k),Q(k),I(k+1),Q(k+1),...)
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carrier doppler frequency ('./data/carfrq-out-PRN, PRN=1,...,32)

  binary format
  
  stream of signed long words (32 bit)
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