mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-04 16:31:17 -05:00
289 lines
10 KiB
FortranFixed
289 lines
10 KiB
FortranFixed
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subroutine map65a
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C Processes timf2 data from Linrad to find and decode JT65 signals.
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parameter (NMAX=60*96000) !Samples per 60 s file
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parameter (MAXMSG=1000) !Size of decoded message list
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integer*2 id(4,NMAX) !46 MB: raw data from Linrad timf2
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parameter (NFFT=32768) !Half symbol = 17833 samples;
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real ss(4,322,NFFT) !169 MB: half-symbol spectra
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real savg(4,NFFT)
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real tavg(-50:50) !Temp for finding local base level
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real base(4) !Local basel level at 4 pol'ns
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real tmp (200) !Temp storage for pctile sorting
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real short(3,NFFT) !SNR dt ipol for potential shorthands
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real sig(MAXMSG,30) !Parameters of detected signals
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real a(5)
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character*22 msg(MAXMSG)
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character*3 shmsg0(4),shmsg
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character arg*12,infile*11,outfile*11
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integer indx(MAXMSG),nsiz(MAXMSG)
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logical done(MAXMSG)
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integer rfile3
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character decoded*22,blank*22,cbad*1
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data blank/' '/
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data shmsg0/'ATT','RO ','RRR','73 '/
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tskip=0.
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fselect=0.
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! fselect=103.0
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nmin=1
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infile='061111.0745'
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C Initialize some constants
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! open(22,file='kvasd.dat',access='direct',recl=1024,
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! + status='unknown')
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open(23,file='CALL3.TXT',status='unknown')
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! nbytes=8*(4*96000+9000) !Empirical, for 061111_0744.dat.48
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! nskip=8*nint(96000*(tskip+4.09375))
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! n=rfile3(infile,id,nskip) !Skip to start of minute
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! if(n.ne.nskip) go to 9999
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df=96000.0/NFFT !df = 96000/NFFT = 2.930 Hz
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fa=0.0
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fb=60000.0
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ia=nint((fa+23000.0)/df + 1.0) ! 23000 = 48000 - 25000
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ib=nint((fb+23000.0)/df + 1.0)
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ftol=0.020 !Frequency tolerance (kHz)
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kk=0
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nkk=1
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do nfile=1,nmin
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! n=rfile3(infile,id,8*NMAX) !Read 60 s of data (approx 46 MB)
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n=8*NMAX
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call rfile3a(infile,id,n,ierr)
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newdat=1
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nz=n/8
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read(infile(8:11),*) nutc
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if(fselect.gt.0.0) then
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nfilt=1 !nfilt=2 is faster for selected freq
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freq=fselect+1.600
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nflip=-1 !May need to try both +/- 1
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ipol=4 !Try all four?
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dt=2.314240 !Not needed?
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call decode1a(id,newdat,nfilt,freq,nflip,ipol,sync2,
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+ a,dt,pol,nkv,nhist,qual,decoded)
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write(11,1010) nutc,nsync1,nsync2,dt,ndf,decoded,
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+ nkv,nqual
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1010 format(i4.4,i5,i4,f5.1,i5,2x,a22,2i3)
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if(nfile.eq.1) go to 999
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endif
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nfilt=1
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do i=1,NFFT
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short(1,i)=0.
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short(2,i)=0.
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short(3,i)=0.
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enddo
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call symspec(id,nz,ss,savg)
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freq0=-999.
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sync10=-999.
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fshort0=-999.
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sync20=-999.
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ntry=0
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do i=ia,ib !Search over freq range
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freq=0.001*((i-1)*df - 23000) + 100.0
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C Find the local base level for each polarization; update every 10 bins.
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if(mod(i-ia,10).eq.0) then
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do jp=1,4
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do ii=-50,50
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tavg(ii)=savg(jp,i+ii)
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enddo
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call pctile(tavg,tmp,101,50,base(jp))
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enddo
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endif
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C Find max signal at this frequency
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smax=0.
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do jp=1,4
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if(savg(jp,i)/base(jp).gt.smax) smax=savg(jp,i)/base(jp)
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enddo
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if(smax.gt.1.1) then
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ntry=ntry+1
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C Look for JT65 sync patterns and shorthand square-wave patterns.
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call ccf65(ss(1,1,i),sync1,ipol,dt,flipk,
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+ syncshort,snr2,ipol2,dt2)
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shmsg=' '
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C Is there a shorthand tone above threshold?
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if(syncshort.gt.1.0) then
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C### Do shorthand AFC here (or maybe after finding a pair?) ###
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short(1,i)=syncshort
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short(2,i)=dt2
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short(3,i)=ipol2
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C Check to see if lower tone of shorthand pair was found.
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do j=2,4
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i0=i-nint(j*53.8330078/df)
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C Should this be i0 +/- 1, or just i0?
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C Should we also insist that difference in DT be either 1.5 or -1.5 s?
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if(short(1,i0).gt.1.0) then
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fshort=0.001*((i0-1)*df - 23000) + 100.0
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C Keep only the best candidate within ftol.
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if(fshort-fshort0.le.ftol .and. sync2.gt.sync20
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+ .and. nkk.eq.2) kk=kk-1
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if(fshort-fshort0.gt.ftol .or.
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+ sync2.gt.sync20) then
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kk=kk+1
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sig(kk,1)=nfile
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sig(kk,2)=nutc
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sig(kk,3)=fshort
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sig(kk,4)=syncshort
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sig(kk,5)=dt2
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sig(kk,6)=45*(ipol2-1)/57.2957795
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sig(kk,7)=0
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sig(kk,8)=snr2
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sig(kk,9)=0
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sig(kk,10)=0
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! sig(kk,11)=rms0
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sig(kk,12)=savg(ipol2,i)
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sig(kk,13)=0
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sig(kk,14)=0
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sig(kk,15)=0
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sig(kk,16)=0
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! sig(kk,17)=0
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sig(kk,18)=0
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msg(kk)=shmsg0(j)
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fshort0=fshort
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sync20=sync2
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nkk=2
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endif
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endif
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enddo
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endif
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C Is sync1 above threshold?
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if(sync1.gt.1.0) then
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C Keep only the best candidate within ftol.
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C (Am I deleting any good decodes by doing this? Any harm in omitting
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C these statements??)
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if(freq-freq0.le.ftol .and. sync1.gt.sync10 .and.
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+ nkk.eq.1) kk=kk-1
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if(freq-freq0.gt.ftol .or. sync1.gt.sync10) then
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nflip=nint(flipk)
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call decode1a(id,newdat,nfilt,freq,nflip,ipol,
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+ sync2,a,dt,pol,nkv,nhist,qual,decoded)
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kk=kk+1
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sig(kk,1)=nfile
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sig(kk,2)=nutc
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sig(kk,3)=freq
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sig(kk,4)=sync1
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sig(kk,5)=dt
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sig(kk,6)=pol
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sig(kk,7)=flipk
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sig(kk,8)=sync2
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sig(kk,9)=nkv
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sig(kk,10)=qual
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! sig(kk,11)=rms0
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sig(kk,12)=savg(ipol,i)
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sig(kk,13)=a(1)
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sig(kk,14)=a(2)
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sig(kk,15)=a(3)
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sig(kk,16)=a(4)
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! sig(kk,17)=a(5)
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sig(kk,18)=nhist
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msg(kk)=decoded
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freq0=freq
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sync10=sync1
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nkk=1
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endif
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endif
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endif
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enddo
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! write(*,1010)
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C Trim the list and produce a sorted index and sizes of groups.
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C (Should trimlist remove all but best SNR for given UTC and message content?)
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call trimlist(sig,kk,indx,nsiz,nz)
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do i=1,kk
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done(i)=.false.
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enddo
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j=0
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ilatest=-1
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do n=1,nz
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ifile0=0
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do m=1,nsiz(n)
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i=indx(j+m)
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ifile=sig(i,1)
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if(ifile.gt.ifile0 .and.msg(i).ne.blank) then
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ilatest=i
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ifile0=ifile
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endif
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enddo
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i=ilatest
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if(i.ge.1) then
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if(.not.done(i)) then
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done(i)=.true.
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nutc=sig(i,2)
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freq=sig(i,3)
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sync1=sig(i,4)
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dt=sig(i,5)
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npol=nint(57.2957795*sig(i,6))
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flip=sig(i,7)
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sync2=sig(i,8)
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nkv=sig(i,9)
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nqual=min(sig(i,10),10.0)
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! rms0=sig(i,11)
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nsavg=sig(i,12) !Was used for diagnostic ...
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do k=1,5
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a(k)=sig(i,12+k)
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enddo
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nhist=sig(i,18)
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decoded=msg(i)
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if(flip.lt.0.0) then
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do i=22,1,-1
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if(decoded(i:i).ne.' ') go to 10
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enddo
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stop 'Error in message format'
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10 if(i.le.18) decoded(i+2:i+4)='OOO'
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endif
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nkHz=nint(freq-1.600)
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f0=144.0+0.001*nkHz
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ndf=nint(1000.0*(freq-1.600-nkHz))
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ndf0=nint(a(1))
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ndf1=nint(a(2))
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ndf2=nint(a(3))
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nsync1=sync1
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nsync2=nint(10.0*log10(sync2)) - 40 !### empirical ###
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cbad=' '
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if(abs(f0-144.103).lt.0.001) then
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write(11,1010) nutc,nsync1,nsync2,dt,ndf,decoded,
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+ nkv,nqual
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endif
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write(19,1012) f0,ndf,npol,nutc,decoded
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1012 format(f7.3,i5,i4,i5.4,2x,a22)
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write(26,1014) f0,ndf,ndf0,ndf1,ndf2,dt,npol,nsync1,
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+ nsync2,nutc,decoded,nkv,nqual,nhist
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1014 format(f7.3,i5,3i3,f5.1,i5,i3,i4,i5.4,2x,a22,3i3)
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endif
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endif
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j=j+nsiz(n)
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enddo
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call display(nutc)
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! if(nfile.ge.1) go to 999
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100 continue
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enddo
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999 call four2a(cx,-1,1,1,1) !Destroy the FFTW plans
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9999 end
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