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https://github.com/saitohirga/WSJT-X.git
synced 2024-11-25 05:38:46 -05:00
Remove iscat Fortran routines.
This commit is contained in:
Joe Taylor
parent
314a506d51
commit
4573c78acd
@ -1,55 +0,0 @@
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subroutine geniscat(msg,msgsent,itone)
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! Generate an ISCAT waveform.
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parameter (NSZ=1291)
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character msg*28,msgsent*28 !Message to be transmitted
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integer imsg(30)
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integer itone(NSZ)
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real*8 sps
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character c*42
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integer icos(4) !Costas array
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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 c/'0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ /.?@-'/
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sps=256.d0*12000.d0/11025.d0
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nsym=int(30*12000.d0/sps)
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nblk=nsync+nlen+ndat
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do i=22,1,-1
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if(msg(i:i).ne.' ' .and. msg(i:i).ne.char(0)) exit
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enddo
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nmsg=i
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msglen=nmsg+1
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k=0
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kk=1
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imsg(1)=40 !Always start with BOM char: '@'
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do i=1,nmsg !Define the tone sequence
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imsg(i+1)=36 !Illegal char set to blank
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do j=1,42
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if(msg(i:i).eq.c(j:j)) imsg(i+1)=j-1
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enddo
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enddo
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do i=1,nsym !Total symbols in 30 s
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j=mod(i-1,nblk)+1
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if(j.le.nsync) then
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itone(i)=icos(j) !Insert 4x4 Costas array
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else if(j.gt.nsync .and. j.le.nsync+nlen) then
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itone(i)=msglen !Insert message-length indicator
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if(j.ge.nsync+2) then
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n=msglen + 5*(j-nsync-1)
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if(n.gt.41) n=n-42
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itone(i)=n
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endif
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else
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k=k+1
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kk=mod(k-1,msglen)+1
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itone(i)=imsg(kk)
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endif
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enddo
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msgsent=msg
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return
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end subroutine geniscat
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206
lib/iscat.f90
206
lib/iscat.f90
@ -1,206 +0,0 @@
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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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@ -1,185 +0,0 @@
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subroutine 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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! Synchronize an ISCAT signal
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! cdat() is the downsampled analytic signal.
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! Sample rate = fsample = BW = 11025 * (9/32) = 3100.78125 Hz
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! npts, nsps, etc., are all reduced by 9/32
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parameter (NMAX=30*3101)
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parameter (NSZ=4*1400)
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complex cdat(NMAX)
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complex c(288)
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real s0(288,NSZ)
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real fs0(288,96) !108 = 96 + 3*4
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real savg(288)
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real sref(288)
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real psavg(72) !Average spectrum of whole file
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integer icos(4)
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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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! Silence compiler warnings:
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sigbest=-20.0
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ndf0best=0
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msglenbest=0
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ipkbest=0
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jpkbest=0
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ipk2=0
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idfbest=mousebutton
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fsample=3100.78125 !New sample rate
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nsps=144/mode4
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nsym=npts/nsps - 1
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nblk=nsync+nlen+ndat
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nfft=2*nsps !FFTs at twice the symbol length,
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kstep=nsps/4 ! stepped by 1/4 symbol
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df=fsample/nfft
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fac=1.0/1000.0 !Somewhat arbitrary
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savg=0.
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s0=0.
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ia=1-kstep
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do j=1,4*nsym !Compute symbol spectra
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ia=ia+kstep
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ib=ia+nsps-1
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if(ib.gt.npts) exit
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c(1:nsps)=fac*cdat(ia:ib)
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c(nsps+1:nfft)=0.
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call four2a(c,nfft,1,-1,1)
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do i=1,nfft
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s0(i,j)=real(c(i))**2 + aimag(c(i))**2
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savg(i)=savg(i) + s0(i,j) !Accumulate avg spectrum
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enddo
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i0=40
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enddo
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jsym=4*nsym
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savg=savg/jsym
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do i=1,71 !Compute spectrum in dB, for plot
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if(mode4.eq.1) then
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psavg(i)=2*db(savg(4*i)+savg(4*i-1)+savg(4*i-2)+savg(4*i-3)) + 1.0
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else
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psavg(i)=2*db(savg(2*i)+savg(2*i-1)) + 7.0
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endif
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enddo
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do i=nh+1,nfft-nh
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call pctile(savg(i-nh),2*nh+1,npct,sref(i))
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enddo
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sref(1:nh)=sref(nh+11)
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sref(nfft-nh+1:nfft)=sref(nfft-nh)
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do i=1,nfft !Normalize the symbol spectra
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fac=1.0/sref(i)
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if(i.lt.11) fac=1.0/savg(11)
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do j=1,jsym
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s0(i,j)=fac*s0(i,j)
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enddo
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enddo
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nfold=jsym/96
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jb=96*nfold
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ttot=npts/fsample !Length of record (s)
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df1=df/ttot !Step size for f1=fdot
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idf1=int(-25.0/df1)
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idf2=int(5.0/df1)
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if(nafc.eq.0) then
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idf1=0
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idf2=0
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else if(mod(-idf1,2).eq.1) then
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idf1=idf1-1
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endif
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xsyncbest=0.
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do idf=idf1,idf2 !Loop over fdot
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fs0=0.
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do j=1,jb !Fold s0 into fs0, modulo 4*nblk
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k=mod(j-1,4*nblk)+1
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ii=nint(idf*float(j-jb/2)/float(jb))
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ia=max(1-ii,1)
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ib=min(nfft-ii,nfft)
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do i=ia,ib
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fs0(i,k)=fs0(i,k) + s0(i+ii,j)
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enddo
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enddo
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ref=nfold*4
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i0=27
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if(mode4.eq.1) i0=95
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ia=i0-nint(ntol/df)
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ib=i0+nint(ntol/df)
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if(ia.lt.1) ia=1
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if(ib.gt.nfft-3) ib=nfft-3
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smax=0.
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ipk=1
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jpk=1
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do j=0,4*nblk-1 !Find sync pattern: lags 0-95
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do i=ia,ib !Search specified freq range
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ss=0.
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do n=1,4 !Sum over 4 sync tones
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k=j+4*n-3
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if(k.gt.96) k=k-96
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ss=ss + fs0(i+2*icos(n),k)
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enddo
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if(ss.gt.smax) then
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smax=ss
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ipk=i !Frequency offset, DF
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jpk=j+1 !Time offset, DT
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endif
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enddo
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enddo
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xsync=smax/ref - 1.0
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if(nfold.lt.26) xsync=xsync * sqrt(nfold/26.0)
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xsync=xsync-0.5 !Empirical
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sig=db(smax/ref - 1.0) - 15.0
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if(mode4.eq.1) sig=sig-5.0
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! if(sig.lt.-20 .or. xsync.lt.1.0) sig=-20.0
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! if(sig.lt.-20) sig=-20.0
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ndf0=nint(df*(ipk-i0))
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smax=0.
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ja=jpk+16
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if(ja.gt.4*nblk) ja=ja-4*nblk
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jj=jpk+20
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if(jj.gt.4*nblk) jj=jj-4*nblk
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do i=ipk,ipk+60,2 !Find User's message length
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ss=fs0(i,ja) + fs0(i+10,jj)
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if(ss.gt.smax) then
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smax=ss
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ipk2=i
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endif
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enddo
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msglen=(ipk2-ipk)/2
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if(msglen.lt.2 .or. msglen.gt.29) cycle
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if(xsync.ge.xsyncbest) then
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xsyncbest=xsync
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sigbest=sig
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ndf0best=ndf0
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msglenbest=msglen
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ipkbest=ipk
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jpkbest=jpk
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idfbest=idf
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endif
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enddo
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xsync=xsyncbest
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sig=sigbest
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ndf0=ndf0best
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msglen=msglenbest
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ipk=ipkbest
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jpk=jpkbest
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idf=idfbest
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if(nafc.eq.0) idf=0
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return
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end subroutine synciscat
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