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Merge branch 'feat-fst280' of bitbucket.org:k1jt/wsjtx into feat-fst280

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This commit is contained in:
Joe Taylor 2020-07-21 14:12:07 -04:00
commit 65c4973ae9
1 changed files with 361 additions and 378 deletions
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739
lib/fst240_decode.f90
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@ -81,13 +81,15 @@ contains
save first,apbits,nappasses,naptypes,mycall0,hiscall0 save first,apbits,nappasses,naptypes,mycall0,hiscall0
! call blanker(iwave,ntrperiod*12000,0.0,0.2) ! call blanker(iwave,ntrperiod*12000,0.0,0.2)
this%callback => callback this%callback => callback
dxcall13=hiscall ! initialize for use in packjt77 dxcall13=hiscall ! initialize for use in packjt77
mycall13=mycall mycall13=mycall
fMHz=1.0e9 fMHz=1.0
if(iwspr.ne.0.and.iwspr.ne.1) return
if(first) then if(first) then
mcq=2*mod(mcq+rvec(1:29),2)-1 mcq=2*mod(mcq+rvec(1:29),2)-1
@ -123,7 +125,7 @@ contains
hiscall0='' hiscall0=''
first=.false. first=.false.
endif endif
l1=index(mycall,char(0)) l1=index(mycall,char(0))
if(l1.ne.0) mycall(l1:)=" " if(l1.ne.0) mycall(l1:)=" "
l1=index(hiscall,char(0)) l1=index(hiscall,char(0))
@ -228,7 +230,7 @@ contains
allocate( c_bigfft(0:nfft1/2) ) allocate( c_bigfft(0:nfft1/2) )
allocate( c2(0:nfft2-1) ) allocate( c2(0:nfft2-1) )
allocate( cframe(0:160*nss-1) ) allocate( cframe(0:160*nss-1) )
if(ndepth.eq.3) then if(ndepth.eq.3) then
nblock=4 nblock=4
jittermax=2 jittermax=2
@ -250,16 +252,6 @@ contains
c_bigfft(i)=cmplx(float(iwave(2*i+1)),float(iwave(2*i+2))) c_bigfft(i)=cmplx(float(iwave(2*i+1)),float(iwave(2*i+2)))
enddo enddo
call four2a(c_bigfft,nfft1,1,-1,0) call four2a(c_bigfft,nfft1,1,-1,0)
if(iwspr.eq.0) then
itype1=1
itype2=1
elseif( iwspr.eq.1 ) then
itype1=2
itype2=2
elseif( iwspr.eq.2 ) then
itype1=1
itype2=2
endif
if(hmod.eq.1) then if(hmod.eq.1) then
if(fMHz.lt.2.0) then if(fMHz.lt.2.0) then
@ -275,325 +267,316 @@ contains
if(hmod.eq.8) nsyncoh=-4 if(hmod.eq.8) nsyncoh=-4
endif endif
do iqorw=itype1,itype2 ! iqorw=1 for QSO mode and iqorw=2 for wspr-type messages if( single_decode ) then
if( iwspr.lt.2 ) then fa=max(100,nint(nfqso+1.5*hmod*baud-ntol))
if( single_decode ) then fb=min(4800,nint(nfqso+1.5*hmod*baud+ntol))
fa=max(100,nint(nfqso+1.5*hmod*baud-ntol)) else
fb=min(4800,nint(nfqso+1.5*hmod*baud+ntol)) fa=max(100,nfa)
else fb=min(4800,nfb)
fa=max(100,nfa) endif
fb=min(4800,nfb)
endif
elseif( iwspr.eq.2 .and. iqorw.eq.1 ) then
fa=max(100,nfa)
fb=nfsplit
elseif( iwspr.eq.2 .and. iqorw.eq.2 ) then
fa=nfsplit
fb=min(4800,nfb)
endif
if(hmod.eq.1) then if(hmod.eq.1) then
if(ntrperiod.eq.15) minsync=1.15 if(ntrperiod.eq.15) minsync=1.15
if(ntrperiod.gt.15) minsync=1.20 if(ntrperiod.gt.15) minsync=1.20
elseif(hmod.gt.1) then elseif(hmod.gt.1) then
minsync=1.2 minsync=1.2
endif endif
! Get first approximation of candidate frequencies ! Get first approximation of candidate frequencies
call get_candidates_fst240(c_bigfft,nfft1,nsps,hmod,fs,fa,fb, & call get_candidates_fst240(c_bigfft,nfft1,nsps,hmod,fs,fa,fb, &
minsync,ncand,candidates,base) minsync,ncand,candidates,base)
ndecodes=0 ndecodes=0
decodes=' ' decodes=' '
isbest=0 isbest=0
fc2=0. fc2=0.
do icand=1,ncand do icand=1,ncand
fc0=candidates(icand,1) fc0=candidates(icand,1)
detmet=candidates(icand,2) detmet=candidates(icand,2)
! Downconvert and downsample a slice of the spectrum centered on the ! Downconvert and downsample a slice of the spectrum centered on the
! rough estimate of the candidates frequency. ! rough estimate of the candidates frequency.
! Output array c2 is complex baseband sampled at 12000/ndown Sa/sec. ! Output array c2 is complex baseband sampled at 12000/ndown Sa/sec.
! The size of the downsampled c2 array is nfft2=nfft1/ndown ! The size of the downsampled c2 array is nfft2=nfft1/ndown
call fst240_downsample(c_bigfft,nfft1,ndown,fc0,sigbw,c2) call fst240_downsample(c_bigfft,nfft1,ndown,fc0,sigbw,c2)
call timer('sync240 ',0) call timer('sync240 ',0)
fc1=0.0 fc1=0.0
if(emedelay.lt.0.1) then ! search offsets from 0 s to 2 s if(emedelay.lt.0.1) then ! search offsets from 0 s to 2 s
is0=1.5*nspsec is0=1.5*nspsec
ishw=1.5*nspsec ishw=1.5*nspsec
else ! search plus or minus 1.5 s centered on emedelay else ! search plus or minus 1.5 s centered on emedelay
is0=nint((emedelay+1.0)*nspsec) is0=nint((emedelay+1.0)*nspsec)
ishw=1.5*nspsec ishw=1.5*nspsec
endif endif
smax=-1.e30 smax=-1.e30
do if=-12,12 do if=-12,12
fc=fc1 + 0.1*baud*if fc=fc1 + 0.1*baud*if
do istart=max(1,is0-ishw),is0+ishw,4*hmod do istart=max(1,is0-ishw),is0+ishw,4*hmod
call sync_fst240(c2,istart,fc,hmod,nsyncoh,nfft2,nss, & call sync_fst240(c2,istart,fc,hmod,nsyncoh,nfft2,nss, &
ntrperiod,fs2,sync) ntrperiod,fs2,sync)
if(sync.gt.smax) then if(sync.gt.smax) then
fc2=fc fc2=fc
isbest=istart isbest=istart
smax=sync smax=sync
endif endif
enddo
enddo enddo
fc1=fc2
is0=isbest
ishw=4*hmod
isst=1*hmod
smax=0.0
do if=-7,7
fc=fc1 + 0.02*baud*if
do istart=max(1,is0-ishw),is0+ishw,isst
call sync_fst240(c2,istart,fc,hmod,nsyncoh,nfft2,nss, &
ntrperiod,fs2,sync)
if(sync.gt.smax) then
fc2=fc
isbest=istart
smax=sync
endif
enddo
enddo
call timer('sync240 ',1)
fc_synced = fc0 + fc2
dt_synced = (isbest-fs2)*dt2 !nominal dt is 1 second so frame starts at sample fs2
candidates(icand,3)=fc_synced
candidates(icand,4)=isbest
enddo enddo
fc1=fc2
is0=isbest
ishw=4*hmod
isst=1*hmod
smax=0.0
do if=-7,7
fc=fc1 + 0.02*baud*if
do istart=max(1,is0-ishw),is0+ishw,isst
call sync_fst240(c2,istart,fc,hmod,nsyncoh,nfft2,nss, &
ntrperiod,fs2,sync)
if(sync.gt.smax) then
fc2=fc
isbest=istart
smax=sync
endif
enddo
enddo
call timer('sync240 ',1)
fc_synced = fc0 + fc2
dt_synced = (isbest-fs2)*dt2 !nominal dt is 1 second so frame starts at sample fs2
candidates(icand,3)=fc_synced
candidates(icand,4)=isbest
enddo
! remove duplicate candidates ! remove duplicate candidates
do icand=1,ncand do icand=1,ncand
fc=candidates(icand,3) fc=candidates(icand,3)
isbest=nint(candidates(icand,4)) isbest=nint(candidates(icand,4))
do ic2=1,ncand do ic2=1,ncand
fc2=candidates(ic2,3) fc2=candidates(ic2,3)
isbest2=nint(candidates(ic2,4)) isbest2=nint(candidates(ic2,4))
if(ic2.ne.icand .and. fc2.gt.0.0) then if(ic2.ne.icand .and. fc2.gt.0.0) then
if(abs(fc2-fc).lt.0.10*baud) then ! same frequency if(abs(fc2-fc).lt.0.10*baud) then ! same frequency
if(abs(isbest2-isbest).le.2) then if(abs(isbest2-isbest).le.2) then
candidates(ic2,3)=-1 candidates(ic2,3)=-1
endif
endif endif
endif endif
enddo
enddo
ic=0
do icand=1,ncand
if(candidates(icand,3).gt.0) then
ic=ic+1
candidates(ic,:)=candidates(icand,:)
endif endif
enddo enddo
ncand=ic enddo
xsnr=0.
do icand=1,ncand ic=0
sync=candidates(icand,2) do icand=1,ncand
fc_synced=candidates(icand,3) if(candidates(icand,3).gt.0) then
isbest=nint(candidates(icand,4)) ic=ic+1
xdt=(isbest-nspsec)/fs2 candidates(ic,:)=candidates(icand,:)
if(ntrperiod.eq.15) xdt=(isbest-real(nspsec)/2.0)/fs2 endif
call fst240_downsample(c_bigfft,nfft1,ndown,fc_synced,sigbw,c2) enddo
do ijitter=0,jittermax ncand=ic
if(ijitter.eq.0) ioffset=0 xsnr=0.
if(ijitter.eq.1) ioffset=1
if(ijitter.eq.2) ioffset=-1
is0=isbest+ioffset
if(is0.lt.0) cycle
cframe=c2(is0:is0+160*nss-1)
bitmetrics=0
if(hmod.eq.1) then
call get_fst240_bitmetrics(cframe,nss,hmod,nblock,nhicoh,bitmetrics,s4,badsync)
else
call get_fst240_bitmetrics2(cframe,nss,hmod,nblock,bitmetrics,s4,badsync)
endif
if(badsync) cycle
hbits=0 do icand=1,ncand
where(bitmetrics(:,1).ge.0) hbits=1 sync=candidates(icand,2)
ns1=count(hbits( 1: 16).eq.(/0,0,0,1,1,0,1,1,0,1,0,0,1,1,1,0/)) fc_synced=candidates(icand,3)
ns2=count(hbits( 77: 92).eq.(/1,1,1,0,0,1,0,0,1,0,1,1,0,0,0,1/)) isbest=nint(candidates(icand,4))
ns3=count(hbits(153:168).eq.(/0,0,0,1,1,0,1,1,0,1,0,0,1,1,1,0/)) xdt=(isbest-nspsec)/fs2
ns4=count(hbits(229:244).eq.(/1,1,1,0,0,1,0,0,1,0,1,1,0,0,0,1/)) if(ntrperiod.eq.15) xdt=(isbest-real(nspsec)/2.0)/fs2
ns5=count(hbits(305:320).eq.(/0,0,0,1,1,0,1,1,0,1,0,0,1,1,1,0/)) call fst240_downsample(c_bigfft,nfft1,ndown,fc_synced,sigbw,c2)
nsync_qual=ns1+ns2+ns3+ns4+ns5 do ijitter=0,jittermax
if(ijitter.eq.0) ioffset=0
if(ijitter.eq.1) ioffset=1
if(ijitter.eq.2) ioffset=-1
is0=isbest+ioffset
if(is0.lt.0) cycle
cframe=c2(is0:is0+160*nss-1)
bitmetrics=0
if(hmod.eq.1) then
call get_fst240_bitmetrics(cframe,nss,hmod,nblock,nhicoh,bitmetrics,s4,badsync)
else
call get_fst240_bitmetrics2(cframe,nss,hmod,nblock,bitmetrics,s4,badsync)
endif
if(badsync) cycle
hbits=0
where(bitmetrics(:,1).ge.0) hbits=1
ns1=count(hbits( 1: 16).eq.(/0,0,0,1,1,0,1,1,0,1,0,0,1,1,1,0/))
ns2=count(hbits( 77: 92).eq.(/1,1,1,0,0,1,0,0,1,0,1,1,0,0,0,1/))
ns3=count(hbits(153:168).eq.(/0,0,0,1,1,0,1,1,0,1,0,0,1,1,1,0/))
ns4=count(hbits(229:244).eq.(/1,1,1,0,0,1,0,0,1,0,1,1,0,0,0,1/))
ns5=count(hbits(305:320).eq.(/0,0,0,1,1,0,1,1,0,1,0,0,1,1,1,0/))
nsync_qual=ns1+ns2+ns3+ns4+ns5
! if(nsync_qual.lt. 46) cycle !### Value ?? ### ! if(nsync_qual.lt. 46) cycle !### Value ?? ###
scalefac=2.83 scalefac=2.83
llra( 1: 60)=bitmetrics( 17: 76, 1) llra( 1: 60)=bitmetrics( 17: 76, 1)
llra( 61:120)=bitmetrics( 93:152, 1) llra( 61:120)=bitmetrics( 93:152, 1)
llra(121:180)=bitmetrics(169:228, 1) llra(121:180)=bitmetrics(169:228, 1)
llra(181:240)=bitmetrics(245:304, 1) llra(181:240)=bitmetrics(245:304, 1)
llra=scalefac*llra llra=scalefac*llra
llrb( 1: 60)=bitmetrics( 17: 76, 2) llrb( 1: 60)=bitmetrics( 17: 76, 2)
llrb( 61:120)=bitmetrics( 93:152, 2) llrb( 61:120)=bitmetrics( 93:152, 2)
llrb(121:180)=bitmetrics(169:228, 2) llrb(121:180)=bitmetrics(169:228, 2)
llrb(181:240)=bitmetrics(245:304, 2) llrb(181:240)=bitmetrics(245:304, 2)
llrb=scalefac*llrb llrb=scalefac*llrb
llrc( 1: 60)=bitmetrics( 17: 76, 3) llrc( 1: 60)=bitmetrics( 17: 76, 3)
llrc( 61:120)=bitmetrics( 93:152, 3) llrc( 61:120)=bitmetrics( 93:152, 3)
llrc(121:180)=bitmetrics(169:228, 3) llrc(121:180)=bitmetrics(169:228, 3)
llrc(181:240)=bitmetrics(245:304, 3) llrc(181:240)=bitmetrics(245:304, 3)
llrc=scalefac*llrc llrc=scalefac*llrc
llrd( 1: 60)=bitmetrics( 17: 76, 4) llrd( 1: 60)=bitmetrics( 17: 76, 4)
llrd( 61:120)=bitmetrics( 93:152, 4) llrd( 61:120)=bitmetrics( 93:152, 4)
llrd(121:180)=bitmetrics(169:228, 4) llrd(121:180)=bitmetrics(169:228, 4)
llrd(181:240)=bitmetrics(245:304, 4) llrd(181:240)=bitmetrics(245:304, 4)
llrd=scalefac*llrd llrd=scalefac*llrd
apmag=maxval(abs(llra))*1.1 apmag=maxval(abs(llra))*1.1
ntmax=nblock+nappasses(nQSOProgress) ntmax=nblock+nappasses(nQSOProgress)
if(lapcqonly) ntmax=nblock+1 if(lapcqonly) ntmax=nblock+1
if(ndepth.eq.1) ntmax=nblock if(ndepth.eq.1) ntmax=nblock
apmask=0 apmask=0
if(iqorw.eq.2) then ! 50-bit msgs, no ap decoding if(iwspr.eq.1) then ! 50-bit msgs, no ap decoding
nblock=4 nblock=4
ntmax=nblock ntmax=nblock
endif
do itry=1,ntmax
if(itry.eq.1) llr=llra
if(itry.eq.2.and.itry.le.nblock) llr=llrb
if(itry.eq.3.and.itry.le.nblock) llr=llrc
if(itry.eq.4.and.itry.le.nblock) llr=llrd
if(itry.le.nblock) then
apmask=0
iaptype=0
endif endif
do itry=1,ntmax if(itry.gt.nblock) then
if(itry.eq.1) llr=llra llr=llra
if(itry.eq.2.and.itry.le.nblock) llr=llrb if(nblock.gt.1) then
if(itry.eq.3.and.itry.le.nblock) llr=llrc if(hmod.eq.1) llr=llrd
if(itry.eq.4.and.itry.le.nblock) llr=llrd if(hmod.eq.2) llr=llrb
if(itry.le.nblock) then if(hmod.eq.4) llr=llrc
if(hmod.eq.8) llr=llrd
endif
iaptype=naptypes(nQSOProgress,itry-nblock)
if(lapcqonly) iaptype=1
if(iaptype.ge.2 .and. apbits(1).gt.1) cycle ! No, or nonstandard, mycall
if(iaptype.ge.3 .and. apbits(30).gt.1) cycle ! No, or nonstandard, dxcall
if(iaptype.eq.1) then ! CQ
apmask=0 apmask=0
iaptype=0 apmask(1:29)=1
llr(1:29)=apmag*mcq(1:29)
endif endif
if(itry.gt.nblock) then if(iaptype.eq.2) then ! MyCall ??? ???
llr=llra apmask=0
if(nblock.gt.1) then apmask(1:29)=1
if(hmod.eq.1) llr=llrd llr(1:29)=apmag*apbits(1:29)
if(hmod.eq.2) llr=llrb
if(hmod.eq.4) llr=llrc
if(hmod.eq.8) llr=llrd
endif
iaptype=naptypes(nQSOProgress,itry-nblock)
if(lapcqonly) iaptype=1
if(iaptype.ge.2 .and. apbits(1).gt.1) cycle ! No, or nonstandard, mycall
if(iaptype.ge.3 .and. apbits(30).gt.1) cycle ! No, or nonstandard, dxcall
if(iaptype.eq.1) then ! CQ
apmask=0
apmask(1:29)=1
llr(1:29)=apmag*mcq(1:29)
endif
if(iaptype.eq.2) then ! MyCall ??? ???
apmask=0
apmask(1:29)=1
llr(1:29)=apmag*apbits(1:29)
endif
if(iaptype.eq.3) then ! MyCall DxCall ???
apmask=0
apmask(1:58)=1
llr(1:58)=apmag*apbits(1:58)
endif
if(iaptype.eq.4 .or. iaptype.eq.5 .or. iaptype .eq.6) then
apmask=0
apmask(1:77)=1
llr(1:58)=apmag*apbits(1:58)
if(iaptype.eq.4) llr(59:77)=apmag*mrrr(1:19)
if(iaptype.eq.5) llr(59:77)=apmag*m73(1:19)
if(iaptype.eq.6) llr(59:77)=apmag*mrr73(1:19)
endif
endif endif
dmin=0.0 if(iaptype.eq.3) then ! MyCall DxCall ???
nharderrors=-1 apmask=0
unpk77_success=.false. apmask(1:58)=1
if(iqorw.eq.1) then llr(1:58)=apmag*apbits(1:58)
maxosd=2
Keff=91
norder=3
call timer('d240_101',0)
call decode240_101(llr,Keff,maxosd,norder,apmask,message101, &
cw,ntype,nharderrors,dmin)
call timer('d240_101',1)
elseif(iqorw.eq.2) then
maxosd=2
call timer('d240_74 ',0)
Keff=64
norder=4
call decode240_74(llr,Keff,maxosd,norder,apmask,message74,cw, &
ntype,nharderrors,dmin)
call timer('d240_74 ',1)
endif endif
if(nharderrors .ge.0) then if(iaptype.eq.4 .or. iaptype.eq.5 .or. iaptype .eq.6) then
if(count(cw.eq.1).eq.0) then apmask=0
nharderrors=-nharderrors apmask(1:77)=1
cycle llr(1:58)=apmag*apbits(1:58)
endif if(iaptype.eq.4) llr(59:77)=apmag*mrrr(1:19)
if(iqorw.eq.1) then if(iaptype.eq.5) llr(59:77)=apmag*m73(1:19)
write(c77,'(77i1)') mod(message101(1:77)+rvec,2) if(iaptype.eq.6) llr(59:77)=apmag*mrr73(1:19)
call unpack77(c77,1,msg,unpk77_success) endif
endif
dmin=0.0
nharderrors=-1
unpk77_success=.false.
if(iwspr.eq.0) then
maxosd=2
Keff=91
norder=3
call timer('d240_101',0)
call decode240_101(llr,Keff,maxosd,norder,apmask,message101, &
cw,ntype,nharderrors,dmin)
call timer('d240_101',1)
elseif(iwspr.eq.1) then
maxosd=2
call timer('d240_74 ',0)
Keff=64
norder=4
call decode240_74(llr,Keff,maxosd,norder,apmask,message74,cw, &
ntype,nharderrors,dmin)
call timer('d240_74 ',1)
endif
if(nharderrors .ge.0) then
if(count(cw.eq.1).eq.0) then
nharderrors=-nharderrors
cycle
endif
if(iwspr.eq.0) then
write(c77,'(77i1)') mod(message101(1:77)+rvec,2)
call unpack77(c77,1,msg,unpk77_success)
else
write(c77,'(50i1)') message74(1:50)
c77(51:77)='000000000000000000000110000'
call unpack77(c77,1,msg,unpk77_success)
endif
if(unpk77_success) then
idupe=0
do i=1,ndecodes
if(decodes(i).eq.msg) idupe=1
enddo
if(idupe.eq.1) goto 2002
ndecodes=ndecodes+1
decodes(ndecodes)=msg
if(iwspr.eq.0) then
call get_fst240_tones_from_bits(message101,itone,0)
else else
write(c77,'(50i1)') message74(1:50) call get_fst240_tones_from_bits(message74,itone,1)
c77(51:77)='000000000000000000000110000'
call unpack77(c77,1,msg,unpk77_success)
endif endif
if(unpk77_success) then inquire(file='plotspec',exist=ex)
idupe=0 fmid=-999.0
do i=1,ndecodes
if(decodes(i).eq.msg) idupe=1
enddo
if(idupe.eq.1) goto 2002
ndecodes=ndecodes+1
decodes(ndecodes)=msg
if(iqorw.eq.1) then
call get_fst240_tones_from_bits(message101,itone,0)
else
call get_fst240_tones_from_bits(message74,itone,1)
endif
inquire(file='plotspec',exist=ex)
fmid=-999.0
if(ex) then
call write_ref(itone,iwave,nsps,nmax,ndown,hmod, &
isbest,fc_synced,fmid,w50)
endif
xsig=0
do i=1,NN
xsig=xsig+s4(itone(i),i)**2
enddo
arg=400.0*(xsig/base)-1.0
if(arg.gt.0.0) then
xsnr=10*log10(arg)-21.0-11.7*log10(nsps/800.0)
else
xsnr=-99.9
endif
else
cycle
endif
nsnr=nint(xsnr)
qual=0.
fsig=fc_synced - 1.5*hmod*baud
if(ex) then if(ex) then
write(21,'(i6.6,8i6,f7.1,f10.2,f7.1,1x,f7.2,1x,f7.1,1x,a37)') & call write_ref(itone,iwave,nsps,nmax,ndown,hmod, &
nutc,icand,itry,nsyncoh,iaptype,ijitter,ntype,nsync_qual,nharderrors,dmin,sync,xsnr,xdt,fsig,msg isbest,fc_synced,fmid,w50)
flush(21)
endif endif
call this%callback(nutc,smax1,nsnr,xdt,fsig,msg, & xsig=0
iaptype,qual,ntrperiod,lwspr,fmid,w50) do i=1,NN
goto 2002 xsig=xsig+s4(itone(i),i)**2
enddo
arg=400.0*(xsig/base)-1.0
if(arg.gt.0.0) then
xsnr=10*log10(arg)-21.0-11.7*log10(nsps/800.0)
else
xsnr=-99.9
endif
else
cycle
endif endif
enddo ! metrics nsnr=nint(xsnr)
enddo ! istart jitter qual=0.
2002 enddo !candidate list fsig=fc_synced - 1.5*hmod*baud
enddo ! iqorw if(ex) then
write(21,'(i6.6,8i6,f7.1,f10.2,f7.1,1x,f7.2,1x,f7.1,1x,a37,f5.3)') &
nutc,icand,itry,nsyncoh,iaptype,ijitter,ntype,nsync_qual, &
nharderrors,dmin,sync,xsnr,xdt,fsig,msg,w50
flush(21)
endif
call this%callback(nutc,smax1,nsnr,xdt,fsig,msg, &
iaptype,qual,ntrperiod,lwspr,fmid,w50)
goto 2002
endif
enddo ! metrics
enddo ! istart jitter
2002 enddo !candidate list
return return
end subroutine decode end subroutine decode
@ -829,97 +812,97 @@ contains
! On "plotspec" special request, compute Doppler spread for a decoded signal ! On "plotspec" special request, compute Doppler spread for a decoded signal
include 'fst240/fst240_params.f90' include 'fst240/fst240_params.f90'
complex, allocatable :: cwave(:) !Reconstructed complex signal complex, allocatable :: cwave(:) !Reconstructed complex signal
complex, allocatable :: g(:) !Channel gain, g(t) in QEX paper complex, allocatable :: g(:) !Channel gain, g(t) in QEX paper
real,allocatable :: ss(:) !Computed power spectrum of g(t) real,allocatable :: ss(:) !Computed power spectrum of g(t)
integer itone(160) !Tones for this message integer itone(160) !Tones for this message
integer*2 iwave(nmax) !Raw Rx data integer*2 iwave(nmax) !Raw Rx data
integer hmod !Modulation index integer hmod !Modulation index
data ncall/0/ data ncall/0/
save ncall save ncall
ncall=ncall+1 ncall=ncall+1
nfft=2*nmax nfft=2*nmax
nwave=max(nmax,(NN+2)*nsps) nwave=max(nmax,(NN+2)*nsps)
allocate(cwave(0:nwave-1)) allocate(cwave(0:nwave-1))
allocate(g(0:nfft-1)) allocate(g(0:nfft-1))
wave=0 wave=0
fsample=12000.0 fsample=12000.0
call gen_fst240wave(itone,NN,nsps,nwave,fsample,hmod,fc,1,cwave,wave) call gen_fst240wave(itone,NN,nsps,nwave,fsample,hmod,fc,1,cwave,wave)
cwave=cshift(cwave,-i0*ndown) cwave=cshift(cwave,-i0*ndown)
fac=1.0/32768 fac=1.0/32768
g(0:nmax-1)=fac*float(iwave)*conjg(cwave(:nmax-1)) g(0:nmax-1)=fac*float(iwave)*conjg(cwave(:nmax-1))
g(nmax:)=0. g(nmax:)=0.
call four2a(g,nfft,1,-1,1) !Forward c2c FFT call four2a(g,nfft,1,-1,1) !Forward c2c FFT
df=12000.0/nfft df=12000.0/nfft
ia=1.0/df ia=1.0/df
smax=0. smax=0.
do i=-ia,ia !Find smax in +/- 1 Hz around 0. do i=-ia,ia !Find smax in +/- 1 Hz around 0.
j=i j=i
if(j.lt.0) j=i+nfft if(j.lt.0) j=i+nfft
s=real(g(j))**2 + aimag(g(j))**2 s=real(g(j))**2 + aimag(g(j))**2
smax=max(s,smax) smax=max(s,smax)
enddo enddo
ia=10.1/df
allocate(ss(-ia:ia)) !Allocate space for +/- 10 Hz
sum1=0.
sum2=0.
nns=0
do i=-ia,ia
j=i
if(j.lt.0) j=i+nfft
ss(i)=(real(g(j))**2 + aimag(g(j))**2)/smax
f=i*df
if(f.ge.-4.0 .and. f.le.-2.0) then
sum1=sum1 + ss(i) !Power between -2 and -4 Hz
nns=nns+1
else if(f.ge.2.0 .and. f.le.4.0) then
sum2=sum2 + ss(i) !Power between +2 and +4 Hz
endif
enddo
avg=min(sum1/nns,sum2/nns) !Compute avg from smaller sum
sum1=0. ia=10.1/df
do i=-ia,ia allocate(ss(-ia:ia)) !Allocate space for +/- 10 Hz
f=i*df sum1=0.
if(abs(f).le.1.0) sum1=sum1 + ss(i)-avg !Power in abs(f) < 1 Hz sum2=0.
enddo nns=0
do i=-ia,ia
j=i
if(j.lt.0) j=i+nfft
ss(i)=(real(g(j))**2 + aimag(g(j))**2)/smax
f=i*df
if(f.ge.-4.0 .and. f.le.-2.0) then
sum1=sum1 + ss(i) !Power between -2 and -4 Hz
nns=nns+1
else if(f.ge.2.0 .and. f.le.4.0) then
sum2=sum2 + ss(i) !Power between +2 and +4 Hz
endif
enddo
avg=min(sum1/nns,sum2/nns) !Compute avg from smaller sum
ia=nint(1.0/df) + 1 sum1=0.
sum2=0.0 do i=-ia,ia
xi1=-999 f=i*df
xi2=-999 if(abs(f).le.1.0) sum1=sum1 + ss(i)-avg !Power in abs(f) < 1 Hz
xi3=-999 enddo
sum2z=0.
do i=-ia,ia !Find freq range that has 50% of signal power
sum2=sum2 + ss(i)-avg
if(sum2.ge.0.25*sum1 .and. xi1.eq.-999.0) then
xi1=i - 1 + (sum2-0.25*sum1)/(sum2-sum2z)
endif
if(sum2.ge.0.50*sum1 .and. xi2.eq.-999.0) then
xi2=i - 1 + (sum2-0.50*sum1)/(sum2-sum2z)
endif
if(sum2.ge.0.75*sum1) then
xi3=i - 1 + (sum2-0.75*sum1)/(sum2-sum2z)
exit
endif
sum2z=sum2
enddo
xdiff=sqrt(1.0+(xi3-xi1)**2) !Keep small values from fluctuating too widely
w50=xdiff*df !Compute Doppler spread
fmid=xi2*df !Frequency midpoint of signal powere
do i=-ia,ia !Save the spectrum for plotting ia=nint(1.0/df) + 1
f=i*df sum2=0.0
y=0.99*ss(i+nint(xi2)) + ncall-1 xi1=-999
write(52,1010) f,y xi2=-999
1010 format(f12.6,f12.6) xi3=-999
enddo sum2z=0.
do i=-ia,ia !Find freq range that has 50% of signal power
sum2=sum2 + ss(i)-avg
if(sum2.ge.0.25*sum1 .and. xi1.eq.-999.0) then
xi1=i - 1 + (sum2-0.25*sum1)/(sum2-sum2z)
endif
if(sum2.ge.0.50*sum1 .and. xi2.eq.-999.0) then
xi2=i - 1 + (sum2-0.50*sum1)/(sum2-sum2z)
endif
if(sum2.ge.0.75*sum1) then
xi3=i - 1 + (sum2-0.75*sum1)/(sum2-sum2z)
exit
endif
sum2z=sum2
enddo
xdiff=sqrt(1.0+(xi3-xi1)**2) !Keep small values from fluctuating too widely
w50=xdiff*df !Compute Doppler spread
fmid=xi2*df !Frequency midpoint of signal powere
return do i=-ia,ia !Save the spectrum for plotting
f=i*df
y=0.99*ss(i+nint(xi2)) + ncall-1
write(52,1010) f,y
1010 format(f12.6,f12.6)
enddo
return
end subroutine write_ref end subroutine write_ref
end module fst240_decode end module fst240_decode