mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-24 05:08:38 -05:00
f715ea6347
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@2756 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
156 lines
4.1 KiB
Fortran
156 lines
4.1 KiB
Fortran
subroutine decoder(ss,c0)
|
|
|
|
! Decoder for JT9.
|
|
|
|
parameter (NMAX=1800*12000) !Total sample intervals per 30 minutes
|
|
parameter (NDMAX=1800*1500) !Sample intervals at 1500 Hz rate
|
|
parameter (NSMAX=22000) !Max length of saved spectra
|
|
real ss(184,NSMAX)
|
|
character*22 msg
|
|
character*33 line
|
|
character*80 fmt,fmt14
|
|
character*20 datetime
|
|
real*4 ccfred(NSMAX)
|
|
integer*1 i1SoftSymbols(207)
|
|
integer*2 id2
|
|
integer ii(1)
|
|
complex c0(NDMAX)
|
|
! common/jt9com/ss0(184,NSMAX),savg(NSMAX),id2(NMAX),nutc0,ndiskdat, &
|
|
! ntr,nfqso,newdat,npts80,nfb,ntol,kin,nzhsym,nsynced,ndecoded
|
|
! common/jt9comB/ss(184,NSMAX),c0
|
|
common/npar/nutc,ndiskdat,ntrperiod,nfqso,newdat,npts8,nfa,nfb,ntol, &
|
|
kin,nzhsym,nsave,nagain,ndepth,nrxlog,nfsample,datetime
|
|
common/tracer/limtrace,lu
|
|
logical first
|
|
data first/.true./
|
|
save
|
|
|
|
call timer('decoder ',0)
|
|
|
|
if(first) then
|
|
limtrace=0
|
|
lu=12
|
|
open(12,file='timer.out',status='unknown')
|
|
open(14,file='wsjtx_rx.log',status='unknown',position='append')
|
|
first=.false.
|
|
endif
|
|
|
|
! if(newdat.ne.0) then
|
|
! ss=ss0
|
|
! c0=c00
|
|
! nutc=nutc0
|
|
! npts8=npts80
|
|
! endif
|
|
|
|
ntrMinutes=ntrperiod/60
|
|
newdat=1
|
|
nsynced=0
|
|
ndecoded=0
|
|
limit=200
|
|
if(ndepth.ge.2) limit=2000
|
|
if(ndepth.ge.3) limit=20000
|
|
|
|
nsps=0
|
|
if(ntrMinutes.eq.1) then
|
|
nsps=6912
|
|
df3=1500.0/2048.0
|
|
fmt='(i4.4,i4,i5,f6.1,f8.0,f6.1,3x,a22)'
|
|
fmt14='(i4.4,i4,i5,f6.1,f8.0,f6.1,i8,3x,a22)'
|
|
else if(ntrMinutes.eq.2) then
|
|
nsps=15360
|
|
df3=1500.0/2048.0
|
|
fmt='(i4.4,i4,i5,f6.1,f8.1,f6.2,3x,a22)'
|
|
fmt14='(i4.4,i4,i5,f6.1,f8.1,f6.2,i8,3x,a22)'
|
|
else if(ntrMinutes.eq.5) then
|
|
nsps=40960
|
|
df3=1500.0/6144.0
|
|
fmt='(i4.4,i4,i5,f6.1,f8.1,f6.2,3x,a22)'
|
|
fmt14='(i4.4,i4,i5,f6.1,f8.1,f6.2,i8,3x,a22)'
|
|
else if(ntrMinutes.eq.10) then
|
|
nsps=82944
|
|
df3=1500.0/12288.0
|
|
fmt='(i4.4,i4,i5,f6.1,f8.2,f6.2,3x,a22)'
|
|
fmt14='(i4.4,i4,i5,f6.1,f8.2,f6.2,i8,3x,a22)'
|
|
else if(ntrMinutes.eq.30) then
|
|
nsps=252000
|
|
df3=1500.0/32768.0
|
|
fmt='(i4.4,i4,i5,f6.1,f8.2,f6.2,3x,a22)'
|
|
fmt14='(i4.4,i4,i5,f6.1,f8.2,f6.2,i8,3x,a22)'
|
|
endif
|
|
if(nsps.eq.0) stop 'Error: bad TRperiod' !Better: return an error code###
|
|
|
|
kstep=nsps/2
|
|
tstep=kstep/12000.0
|
|
|
|
call timer('sync9 ',0)
|
|
call sync9(ss,nzhsym,tstep,df3,ntol,nfqso,ccfred,ia,ib,ipk) !Compute ccfred
|
|
call timer('sync9 ',1)
|
|
|
|
! open(13,file='decoded.txt',status='unknown')
|
|
! rewind 13
|
|
if(iand(nRxLog,2).ne.0) rewind 14
|
|
if(iand(nRxLog,1).ne.0) then
|
|
! Write date and time to lu 14
|
|
endif
|
|
|
|
nRxLog=0
|
|
fgood=0.
|
|
df8=1500.0/(nsps/8)
|
|
sbest=0.
|
|
|
|
10 ii=maxloc(ccfred(ia:ib))
|
|
i=ii(1) + ia - 1
|
|
f=(i-1)*df3
|
|
if((i.eq.ipk .or. ccfred(i).ge.3.0) .and. abs(f-fgood).gt.10.0*df8) then
|
|
call timer('spec9 ',0)
|
|
call spec9(c0,npts8,nsps,f,fpk,xdt,snr,i1SoftSymbols)
|
|
call timer('spec9 ',1)
|
|
|
|
call timer('decode9 ',0)
|
|
call decode9(i1SoftSymbols,limit,nlim,msg)
|
|
call timer('decode9 ',1)
|
|
|
|
sync=(ccfred(i)-1.0)/2.0
|
|
if(sync.lt.0.0) sync=0.0
|
|
nsync=sync
|
|
if(nsync.gt.10) nsync=10
|
|
nsnr=nint(snr)
|
|
drift=0.0
|
|
|
|
if(ccfred(i).gt.sbest .and. fgood.eq.0.0) then
|
|
sbest=ccfred(i)
|
|
write(line,fmt) nutc,nsync,nsnr,xdt,1000.0+fpk,drift
|
|
if(nsync.gt.0) nsynced=1
|
|
endif
|
|
|
|
if(msg.ne.' ') then
|
|
write(*,fmt) nutc,nsync,nsnr,xdt,1000.0+fpk,drift,msg
|
|
write(14,fmt14) nutc,nsync,nsnr,xdt,1000.0+fpk,drift,nlim,msg
|
|
fgood=f
|
|
nsynced=1
|
|
ndecoded=1
|
|
ccfred(max(ia,i-3):min(ib,i+11))=0.
|
|
endif
|
|
endif
|
|
ccfred(i)=0.
|
|
if(maxval(ccfred(ia:ib)).gt.3.0) go to 10
|
|
|
|
if(fgood.eq.0.0) then
|
|
write(*,1020) line
|
|
write(14,1020) line
|
|
1020 format(a33)
|
|
endif
|
|
|
|
write(*,1010) nsum,nsave
|
|
1010 format('<DecodeFinished>',2i4)
|
|
flush(6)
|
|
|
|
call flush(6)
|
|
call flush(14)
|
|
|
|
call timer('decoder ',1)
|
|
if(nstandalone.eq.0) call timer('decoder ',101)
|
|
|
|
return
|
|
end subroutine decoder
|