Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
14352 changed files with 3176737 additions and 0 deletions
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+program ft8d
+
+! Decode FT8 data read from *.wav files.
+
+! FT8 is a potential mode intended for use at 6m (and maybe HF).  It uses an
+! LDPC (174,87) code, 8-FSK modulation, and 15 second T/R sequences.  Otherwise
+! should behave like JT65 and JT9 as used on HF bands, except that QSOs are
+! 4 x faster.
+
+! Reception and Demodulation algorithm:
+!   ... tbd ...
+
+  include 'ft8_params.f90'
+  character*12 arg
+  character infile*80,datetime*13
+  real s(NH1,NHSYM)
+  real candidate(3,100)
+  integer ihdr(11)
+  integer*2 iwave(NMAX)                 !Generated full-length waveform  
+  
+  nargs=iargc()
+  if(nargs.lt.3) then
+     print*,'Usage:   ft8d MaxIt Norder file1 [file2 ...]'
+     print*,'Example  ft8d   40     2   *.wav'
+     go to 999
+  endif
+  call getarg(1,arg)
+  read(arg,*) max_iterations
+  call getarg(2,arg)
+  read(arg,*) norder
+  nfiles=nargs-2
+
+  twopi=8.0*atan(1.0)
+  fs=12000.0                             !Sample rate
+  dt=1.0/fs                              !Sample interval (s)
+  tt=NSPS*dt                             !Duration of "itone" symbols (s)
+  ts=2*NSPS*dt                           !Duration of OQPSK symbols (s)
+  baud=1.0/tt                            !Keying rate (baud)
+  txt=NZ*dt                              !Transmission length (s)
+
+  do ifile=1,nfiles
+     call getarg(ifile+2,infile)
+     open(10,file=infile,status='old',access='stream')
+     read(10,end=999) ihdr,iwave
+     close(10)
+     j2=index(infile,'.wav')
+     read(infile(j2-6:j2-1),*) nutc
+     datetime=infile(j2-13:j2-1)
+     call sync8(iwave,s,candidate,ncand)
+     call ft8b(datetime,s,candidate,ncand)
+  enddo   ! ifile loop
+
+999 end program ft8d
+