WSJT-X/map65a.f

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subroutine map65a
C Processes timf2 data from Linrad to find and decode JT65 signals.
parameter (NMAX=60*96000) !Samples per 60 s file
parameter (MAXMSG=1000) !Size of decoded message list
integer*2 id(4,NMAX) !46 MB: raw data from Linrad timf2
parameter (NFFT=32768) !Half symbol = 17833 samples;
real ss(4,322,NFFT) !169 MB: half-symbol spectra
real savg(4,NFFT)
real tavg(-50:50) !Temp for finding local base level
real base(4) !Local basel level at 4 pol'ns
real tmp (200) !Temp storage for pctile sorting
real short(3,NFFT) !SNR dt ipol for potential shorthands
real sig(MAXMSG,30) !Parameters of detected signals
real a(5)
character*22 msg(MAXMSG)
character*3 shmsg0(4),shmsg
character arg*12,infile*11,outfile*11
integer indx(MAXMSG),nsiz(MAXMSG)
logical done(MAXMSG)
integer rfile3
character decoded*22,blank*22,cbad*1
data blank/' '/
data shmsg0/'ATT','RO ','RRR','73 '/
tskip=0.
fselect=0.
! fselect=103.0
nmin=1
infile='061111.0745'
C Initialize some constants
! open(22,file='kvasd.dat',access='direct',recl=1024,
! + status='unknown')
open(23,file='CALL3.TXT',status='unknown')
! nbytes=8*(4*96000+9000) !Empirical, for 061111_0744.dat.48
! nskip=8*nint(96000*(tskip+4.09375))
! n=rfile3(infile,id,nskip) !Skip to start of minute
! if(n.ne.nskip) go to 9999
df=96000.0/NFFT !df = 96000/NFFT = 2.930 Hz
fa=0.0
fb=60000.0
ia=nint((fa+23000.0)/df + 1.0) ! 23000 = 48000 - 25000
ib=nint((fb+23000.0)/df + 1.0)
ftol=0.020 !Frequency tolerance (kHz)
kk=0
nkk=1
do nfile=1,nmin
! n=rfile3(infile,id,8*NMAX) !Read 60 s of data (approx 46 MB)
n=8*NMAX
call rfile3a(infile,id,n,ierr)
newdat=1
nz=n/8
read(infile(8:11),*) nutc
if(fselect.gt.0.0) then
nfilt=1 !nfilt=2 is faster for selected freq
freq=fselect+1.600
nflip=-1 !May need to try both +/- 1
ipol=4 !Try all four?
dt=2.314240 !Not needed?
call decode1a(id,newdat,nfilt,freq,nflip,ipol,sync2,
+ a,dt,pol,nkv,nhist,qual,decoded)
write(11,1010) nutc,nsync1,nsync2,dt,ndf,decoded,
+ nkv,nqual
1010 format(i4.4,i5,i4,f5.1,i5,2x,a22,2i3)
if(nfile.eq.1) go to 999
endif
nfilt=1
do i=1,NFFT
short(1,i)=0.
short(2,i)=0.
short(3,i)=0.
enddo
call symspec(id,nz,ss,savg)
freq0=-999.
sync10=-999.
fshort0=-999.
sync20=-999.
ntry=0
do i=ia,ib !Search over freq range
freq=0.001*((i-1)*df - 23000) + 100.0
C Find the local base level for each polarization; update every 10 bins.
if(mod(i-ia,10).eq.0) then
do jp=1,4
do ii=-50,50
tavg(ii)=savg(jp,i+ii)
enddo
call pctile(tavg,tmp,101,50,base(jp))
enddo
endif
C Find max signal at this frequency
smax=0.
do jp=1,4
if(savg(jp,i)/base(jp).gt.smax) smax=savg(jp,i)/base(jp)
enddo
if(smax.gt.1.1) then
ntry=ntry+1
C Look for JT65 sync patterns and shorthand square-wave patterns.
call ccf65(ss(1,1,i),sync1,ipol,dt,flipk,
+ syncshort,snr2,ipol2,dt2)
shmsg=' '
C Is there a shorthand tone above threshold?
if(syncshort.gt.1.0) then
C### Do shorthand AFC here (or maybe after finding a pair?) ###
short(1,i)=syncshort
short(2,i)=dt2
short(3,i)=ipol2
C Check to see if lower tone of shorthand pair was found.
do j=2,4
i0=i-nint(j*53.8330078/df)
C Should this be i0 +/- 1, or just i0?
C Should we also insist that difference in DT be either 1.5 or -1.5 s?
if(short(1,i0).gt.1.0) then
fshort=0.001*((i0-1)*df - 23000) + 100.0
C Keep only the best candidate within ftol.
if(fshort-fshort0.le.ftol .and. sync2.gt.sync20
+ .and. nkk.eq.2) kk=kk-1
if(fshort-fshort0.gt.ftol .or.
+ sync2.gt.sync20) then
kk=kk+1
sig(kk,1)=nfile
sig(kk,2)=nutc
sig(kk,3)=fshort
sig(kk,4)=syncshort
sig(kk,5)=dt2
sig(kk,6)=45*(ipol2-1)/57.2957795
sig(kk,7)=0
sig(kk,8)=snr2
sig(kk,9)=0
sig(kk,10)=0
! sig(kk,11)=rms0
sig(kk,12)=savg(ipol2,i)
sig(kk,13)=0
sig(kk,14)=0
sig(kk,15)=0
sig(kk,16)=0
! sig(kk,17)=0
sig(kk,18)=0
msg(kk)=shmsg0(j)
fshort0=fshort
sync20=sync2
nkk=2
endif
endif
enddo
endif
C Is sync1 above threshold?
if(sync1.gt.1.0) then
C Keep only the best candidate within ftol.
C (Am I deleting any good decodes by doing this? Any harm in omitting
C these statements??)
if(freq-freq0.le.ftol .and. sync1.gt.sync10 .and.
+ nkk.eq.1) kk=kk-1
if(freq-freq0.gt.ftol .or. sync1.gt.sync10) then
nflip=nint(flipk)
call decode1a(id,newdat,nfilt,freq,nflip,ipol,
+ sync2,a,dt,pol,nkv,nhist,qual,decoded)
kk=kk+1
sig(kk,1)=nfile
sig(kk,2)=nutc
sig(kk,3)=freq
sig(kk,4)=sync1
sig(kk,5)=dt
sig(kk,6)=pol
sig(kk,7)=flipk
sig(kk,8)=sync2
sig(kk,9)=nkv
sig(kk,10)=qual
! sig(kk,11)=rms0
sig(kk,12)=savg(ipol,i)
sig(kk,13)=a(1)
sig(kk,14)=a(2)
sig(kk,15)=a(3)
sig(kk,16)=a(4)
! sig(kk,17)=a(5)
sig(kk,18)=nhist
msg(kk)=decoded
freq0=freq
sync10=sync1
nkk=1
endif
endif
endif
enddo
! write(*,1010)
C Trim the list and produce a sorted index and sizes of groups.
C (Should trimlist remove all but best SNR for given UTC and message content?)
call trimlist(sig,kk,indx,nsiz,nz)
do i=1,kk
done(i)=.false.
enddo
j=0
ilatest=-1
do n=1,nz
ifile0=0
do m=1,nsiz(n)
i=indx(j+m)
ifile=sig(i,1)
if(ifile.gt.ifile0 .and.msg(i).ne.blank) then
ilatest=i
ifile0=ifile
endif
enddo
i=ilatest
if(i.ge.1) then
if(.not.done(i)) then
done(i)=.true.
nutc=sig(i,2)
freq=sig(i,3)
sync1=sig(i,4)
dt=sig(i,5)
npol=nint(57.2957795*sig(i,6))
flip=sig(i,7)
sync2=sig(i,8)
nkv=sig(i,9)
nqual=min(sig(i,10),10.0)
! rms0=sig(i,11)
nsavg=sig(i,12) !Was used for diagnostic ...
do k=1,5
a(k)=sig(i,12+k)
enddo
nhist=sig(i,18)
decoded=msg(i)
if(flip.lt.0.0) then
do i=22,1,-1
if(decoded(i:i).ne.' ') go to 10
enddo
stop 'Error in message format'
10 if(i.le.18) decoded(i+2:i+4)='OOO'
endif
nkHz=nint(freq-1.600)
f0=144.0+0.001*nkHz
ndf=nint(1000.0*(freq-1.600-nkHz))
ndf0=nint(a(1))
ndf1=nint(a(2))
ndf2=nint(a(3))
nsync1=sync1
nsync2=nint(10.0*log10(sync2)) - 40 !### empirical ###
cbad=' '
if(abs(f0-144.103).lt.0.001) then
write(11,1010) nutc,nsync1,nsync2,dt,ndf,decoded,
+ nkv,nqual
endif
write(19,1012) f0,ndf,npol,nutc,decoded
1012 format(f7.3,i5,i4,i5.4,2x,a22)
write(26,1014) f0,ndf,ndf0,ndf1,ndf2,dt,npol,nsync1,
+ nsync2,nutc,decoded,nkv,nqual,nhist
1014 format(f7.3,i5,3i3,f5.1,i5,i3,i4,i5.4,2x,a22,3i3)
endif
endif
j=j+nsiz(n)
enddo
call display(nutc)
! if(nfile.ge.1) go to 999
100 continue
enddo
999 call four2a(cx,-1,1,1,1) !Destroy the FFTW plans
9999 end