mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-15 16:42:12 -05:00
d092f7eae3
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@3199 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
163 lines
4.6 KiB
Fortran
163 lines
4.6 KiB
Fortran
subroutine decoder(ss,c0,nstandalone)
|
|
|
|
! 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*80 fmt
|
|
character*20 datetime
|
|
real*4 ccfred(NSMAX)
|
|
logical ccfok(NSMAX)
|
|
logical done(NSMAX)
|
|
integer*1 i1SoftSymbols(207)
|
|
integer ii(1)
|
|
complex c0(NDMAX)
|
|
complex c1(NDMAX)
|
|
common/npar/nutc,ndiskdat,ntrperiod,nfqso,newdat,npts8,nfa,nfb,ntol, &
|
|
kin,nzhsym,nsave,nagain,ndepth,nrxlog,nfsample,datetime
|
|
common/tracer/limtrace,lu
|
|
save
|
|
|
|
call timer('decoder ',0)
|
|
|
|
open(13,file='decoded.txt',status='unknown')
|
|
ntrMinutes=ntrperiod/60
|
|
newdat=1
|
|
nsynced=0
|
|
ndecoded=0
|
|
nsps=0
|
|
|
|
if(ntrMinutes.eq.1) then
|
|
nsps=6912
|
|
df3=1500.0/2048.0
|
|
fmt='(i4.4,i4,i5,f6.1,f8.0,i4,3x,a22)'
|
|
else if(ntrMinutes.eq.2) then
|
|
nsps=15360
|
|
df3=1500.0/2048.0
|
|
fmt='(i4.4,i4,i5,f6.1,f8.1,i4,3x,a22)'
|
|
else if(ntrMinutes.eq.5) then
|
|
nsps=40960
|
|
df3=1500.0/6144.0
|
|
fmt='(i4.4,i4,i5,f6.1,f8.1,i4,3x,a22)'
|
|
else if(ntrMinutes.eq.10) then
|
|
nsps=82944
|
|
df3=1500.0/12288.0
|
|
fmt='(i4.4,i4,i5,f6.1,f8.2,i4,3x,a22)'
|
|
else if(ntrMinutes.eq.30) then
|
|
nsps=252000
|
|
df3=1500.0/32768.0
|
|
fmt='(i4.4,i4,i5,f6.1,f8.2,i4,3x,a22)'
|
|
endif
|
|
if(nsps.eq.0) stop 'Error: bad TRperiod' !Better: return an error code###
|
|
|
|
tstep=0.5*nsps/12000.0 !Half-symbol step (seconds)
|
|
idf=ntol/df3 + 0.999
|
|
done=.false.
|
|
|
|
do nqd=1,0,-1
|
|
limit=5000
|
|
ccflim=4.0
|
|
if(ndepth.ge.2) then
|
|
limit=50000
|
|
ccflim=3.0
|
|
endif
|
|
if(ndepth.ge.3 .or. nqd.eq.1) then
|
|
limit=200000
|
|
ccflim=2.5
|
|
endif
|
|
! if(nstandalone.eq.1) ccflim=0.9*ccflim
|
|
|
|
if(nqd.eq.1) then
|
|
nfa1=nfqso-ntol
|
|
nfb1=nfqso+ntol
|
|
else
|
|
nfa1=nfa
|
|
nfb1=nfb
|
|
endif
|
|
call timer('sync9 ',0)
|
|
! Compute ccfred()
|
|
call sync9(ss,nzhsym,tstep,df3,nfa1,nfb1,ccfred,ia,ib,ipk)
|
|
call timer('sync9 ',1)
|
|
|
|
ccfok=.false.
|
|
ccfok(max(ipk-idf,1):min(ipk+idf,NSMAX))=.true.
|
|
|
|
if(nqd.eq.1) then
|
|
ia1=ia
|
|
ib1=ib
|
|
else
|
|
do i=ia+9,ib-25
|
|
t1=ccfred(i)/(sum(ccfred(i-8:i-6)/3.0))
|
|
t2=ccfred(i)/(sum(ccfred(i+23:i+25)/3.0))
|
|
if(t1.ge.ccflim .and. t2.ge.ccflim) ccfok(i)=.true.
|
|
enddo
|
|
ccfok(ia1:ib1)=.false.
|
|
endif
|
|
|
|
nRxLog=0
|
|
fgood=0.
|
|
nsps8=nsps/8
|
|
df8=1500.0/nsps8
|
|
dblim=db(864.0/nsps8) - 26.2
|
|
i1=max(nint((nfqso-1000)/df3 - 10),ia)
|
|
i2=min(nint((nfqso-1000)/df3 + 10),ib)
|
|
ii=maxloc(ccfred(i1:i2))
|
|
|
|
do i=ia,ib
|
|
f=(i-1)*df3
|
|
if(done(i) .or. (.not.ccfok(i)) .or. (ccfred(i).lt.ccflim-1.0) .or. &
|
|
(ccfred(i).lt.ccfred(i+1))) cycle
|
|
if(nqd.eq.1 .or. &
|
|
(ccfred(i).ge.ccflim .and. abs(f-fgood).gt.10.0*df8)) then
|
|
call timer('softsym ',0)
|
|
fpk=1000.0 + df3*(i-1)
|
|
c1(1:npts8)=conjg(c0(1:npts8))
|
|
call softsym(c1,npts8,nsps8,fpk,syncpk,snrdb,xdt,freq,drift, &
|
|
i1SoftSymbols)
|
|
call timer('softsym ',1)
|
|
|
|
call timer('decode9 ',0)
|
|
call decode9(i1SoftSymbols,limit,nlim,msg)
|
|
call timer('decode9 ',1)
|
|
|
|
sync=(syncpk+1)/4.0
|
|
if(sync.lt.0.0 .or. snrdb.lt.dblim-2.0) sync=0.0
|
|
nsync=sync
|
|
if(nsync.gt.10) nsync=10
|
|
nsnr=nint(snrdb)
|
|
ndrift=nint(drift/df3)
|
|
if(msg.ne.' ') then
|
|
write(*,fmt) nutc,nsync,nsnr,xdt,freq,ndrift,msg
|
|
write(13,fmt) nutc,nsync,nsnr,xdt,freq,ndrift,msg
|
|
! write(14,1014) nutc,nsync,nsnr,xdt,freq,ndrift,ccfred(i),nlim,msg
|
|
!1014 format(i4.4,i4,i5,f6.1,f8.0,i4,f9.1,i9,3x,a22)
|
|
iaa=max(1,i-3)
|
|
ibb=min(NSMAX,i+11)
|
|
fgood=f
|
|
nsynced=1
|
|
ndecoded=1
|
|
ccfok(iaa:ibb)=.false.
|
|
done(iaa:ibb)=.true.
|
|
call flush(6)
|
|
endif
|
|
endif
|
|
enddo
|
|
call flush(6)
|
|
if(nagain.ne.0) exit
|
|
enddo
|
|
|
|
write(*,1010) nsynced,ndecoded
|
|
1010 format('<DecodeFinished>',2i4)
|
|
call flush(6)
|
|
close(13)
|
|
! call flush(14)
|
|
|
|
call timer('decoder ',1)
|
|
if(nstandalone.eq.0) call timer('decoder ',101)
|
|
|
|
return
|
|
end subroutine decoder
|