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61 lines
1.7 KiB
Fortran
61 lines
1.7 KiB
Fortran
subroutine s3avg(nsave,mode65,nutc,nhz,xdt,npol,ntol,s3,nsum,nkv,decoded)
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! Save the current synchronized spectra, s3(64,63), for possible
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! decoding of average.
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real s3(64,63) !Synchronized spectra for 63 symbols
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real s3a(64,63,64) !Saved spectra
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real s3b(64,63) !Average spectra
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integer iutc(64),ihz(64),ipol(64)
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real dt(64)
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character*22 decoded
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logical ltext,first
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data first/.true./
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save
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if(first) then
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iutc=-1
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ihz=0
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ipol=0
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first=.false.
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ihzdiff=min(100,ntol)
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dtdiff=0.2
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endif
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do i=1,64
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if(nutc.eq.iutc(i) .and. abs(nhz-ihz(i)).lt.ihzdiff) then
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nsave=mod(nsave-1+64,64)+1
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go to 10
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endif
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enddo
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iutc(nsave)=nutc !Save UTC
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ihz(nsave)=nhz !Save freq in Hz
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ipol(nsave)=npol !Save pol
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dt(nsave)=xdt !Save DT
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s3a(1:64,1:63,nsave)=s3 !Save the spectra
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10 s3b=0.
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do i=1,64 !Accumulate avg spectra
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if(iutc(i).lt.0) cycle
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if(mod(iutc(i),2).ne.mod(nutc,2)) cycle !Use only same sequence
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if(abs(nhz-ihz(i)).gt.ihzdiff) cycle !Freq must match
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if(abs(xdt-dt(i)).gt.dtdiff) cycle !DT must match
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s3b=s3b + s3a(1:64,1:63,i)
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nsum=nsum+1
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enddo
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decoded=' '
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if(nsum.ge.2) then !Try decoding the sverage
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nadd=mode65*nsum
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call extract(s3b,nadd,ncount,nhist,decoded,ltext) !Extract the message
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nkv=nsum
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if(ncount.lt.0) then
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nkv=0
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decoded=' '
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endif
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endif
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return
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end subroutine s3avg
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