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https://github.com/saitohirga/WSJT-X.git
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207 lines
5.2 KiB
Fortran
207 lines
5.2 KiB
Fortran
subroutine iscat(cdat0,npts0,nh,npct,t2,pick,cfile6,minsync,ntol, &
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mousebutton,mode4,nafc,nmore,psavg,maxlines,nlines,line)
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! Decode an ISCAT signal
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parameter (NMAX=30*3101)
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parameter (NSZ=4*1400)
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character cfile6*6 !File time
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character c42*42
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character msg*29,msg1*29,msgbig*29
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character*80 line(100)
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character csync*1
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complex cdat0(NMAX)
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complex cdat(NMAX)
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real s0(288,NSZ)
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real fs1(0:41,30)
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real psavg(72) !Average spectrum of whole file
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integer nsum(30)
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integer ntol
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integer icos(4)
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logical pick,last
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data icos/0,1,3,2/
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data nsync/4/,nlen/2/,ndat/18/
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data c42/'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ /.?@-'/
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save cdat,s0
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nlines = 0
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fsample=3100.78125 !Sample rate after 9/32 downsampling
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nsps=144/mode4
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bigworst=-1.e30 !Silence compiler warnings ...
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bigxsync=0.
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bigsig=-1.e30
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msglenbig=0
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ndf0big=0
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nfdotbig=0
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bigt2=0.
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bigavg=0.
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bigtana=0.
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if(nmore.eq.-999) bigsig=-1 !... to here
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last=.false.
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do inf=1,6 !Loop over data-segment sizes
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nframes=2**inf
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if(nframes*24*nsps.gt.npts0) then
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nframes=npts0/(24*nsps)
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last=.true.
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endif
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npts=nframes*24*nsps
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do ia=1,npts0-npts,nsps*24 !Loop over start times stepped by 1 frame
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ib=ia+npts-1
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cdat(1:npts)=cdat0(ia:ib)
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t3=(ia + 0.5*npts)/fsample + 0.9
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if(pick) t3=t2+t3
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! Compute symbol spectra and establish sync:
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call synciscat(cdat,npts,nh,npct,s0,jsym,df,ntol, &
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mousebutton,mode4,nafc,psavg,xsync,sig,ndf0,msglen, &
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ipk,jpk,idf,df1)
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nfdot=nint(idf*df1)
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isync=xsync
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if(msglen.eq.0 .or. isync.lt.max(minsync,0)) then
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msglen=0
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worst=1.
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avg=1.
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ndf0=0
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cycle
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endif
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ipk3=0 !Silence compiler warning
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nblk=nsync+nlen+ndat
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fs1=0.
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nsum=0
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nfold=jsym/96
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jb=96*nfold
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k=0
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n=0
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do j=jpk,jsym,4 !Fold information symbols into fs1
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k=k+1
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km=mod(k-1,nblk)+1
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if(km.gt.6) then
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n=n+1
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m=mod(n-1,msglen)+1
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ii=nint(idf*float(j-jb/2)/float(jb))
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do i=0,41
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iii=ii+ipk+2*i
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if(iii.ge.1 .and. iii.le.288) fs1(i,m)=fs1(i,m) + s0(iii,j)
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enddo
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nsum(m)=nsum(m)+1
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endif
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enddo
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do m=1,msglen
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fs1(0:41,m)=fs1(0:41,m)/nsum(m)
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enddo
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! Read out the message contents:
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msg= ' '
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msg1=' '
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mpk=0
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worst=9999.
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sum=0.
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do m=1,msglen
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smax=0.
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smax2=0.
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do i=0,41
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if(fs1(i,m).gt.smax) then
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smax=fs1(i,m)
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ipk3=i
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endif
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enddo
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do i=0,41
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if(fs1(i,m).gt.smax2 .and. i.ne.ipk3) smax2=fs1(i,m)
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enddo
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rr=0.
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if(smax2.gt.0.0) rr=smax/smax2
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sum=sum + rr
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if(rr.lt.worst) worst=rr
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if(ipk3.eq.40) mpk=m
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msg1(m:m)=c42(ipk3+1:ipk3+1)
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enddo
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avg=sum/msglen
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if(mpk.eq.1) then
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msg=msg1(2:)
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else if(mpk.lt.msglen) then
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msg=msg1(mpk+1:msglen)//msg1(1:mpk-1)
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else
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msg=msg1(1:msglen-1)
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endif
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ttot=npts/3100.78125
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if(worst.gt.bigworst) then
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bigworst=worst
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bigavg=avg
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bigxsync=xsync
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bigsig=sig
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ndf0big=ndf0
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nfdotbig=nfdot
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msgbig=msg
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msglenbig=msglen
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bigt2=t3
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bigtana=nframes*24*nsps/fsample
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endif
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isync = xsync
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if(avg.gt.2.5 .and. xsync.ge.max(float(minsync),1.5) .and. &
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maxlines.ge.2) then
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nsig=nint(sig)
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nworst=10.0*(worst-1.0)
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navg=10.0*(avg-1.0)
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if(nworst.gt.10) nworst=10
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if(navg.gt.10) navg=10
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tana=nframes*24*nsps/fsample
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csync=' '
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if(isync.ge.1) csync='*'
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if(nlines.le.maxlines-1) nlines = nlines + 1
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write(line(nlines),1020) cfile6,isync,nsig,t2,ndf0,nfdot,csync, &
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msg(1:28),msglen,navg,nworst,tana,char(0)
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endif
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enddo
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if(last) exit
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enddo
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worst=bigworst
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avg=bigavg
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xsync=bigxsync
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sig=bigsig
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ndf0=ndf0big
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nfdot=nfdotbig
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msg=msgbig
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msglen=msglenbig
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t2=bigt2
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tana=bigtana
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isync=xsync
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nworst=10.0*(worst-1.0)
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navg=10.0*(avg-1.0)
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if(nworst.gt.10) nworst=10
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if(navg.gt.10) navg=10
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if(navg.le.0 .or. isync.lt.max(minsync,0)) then
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msg=' '
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nworst=0
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navg=0
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ndf0=0
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nfdot=0
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sig=-20
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msglen=0
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tana=0.
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t2=0.
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endif
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csync=' '
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if(isync.ge.1) csync='*'
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nsig=nint(sig)
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if(nlines.le.maxlines-1) nlines = nlines + 1
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write(line(nlines),1020) cfile6,isync,nsig,t2,ndf0,nfdot,csync,msg(1:28), &
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msglen,navg,nworst,tana,char(0)
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1020 format(a6,2i4,f5.1,i5,i4,1x,a1,2x,a28,i4,i3,2x,i1,f5.1,a1)
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return
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end subroutine iscat
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