mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2025-10-31 13:10:19 -04:00
Much improved detection of sync in JT4 decoder.
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@6686 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Joe Taylor
parent
1531f3ad3b
commit
4bcc4f35a1
@ -327,6 +327,7 @@ set (wsjt_FSRCS
|
||||
lib/filbig.f90
|
||||
lib/flat1.f90
|
||||
lib/flat1a.f90
|
||||
lib/flat1b.f90
|
||||
lib/flat2.f90
|
||||
lib/flat4.f90
|
||||
lib/flat65.f90
|
||||
@ -352,7 +353,6 @@ set (wsjt_FSRCS
|
||||
lib/hashing.f90
|
||||
lib/hint65.f90
|
||||
lib/hspec.f90
|
||||
lib/image.f90
|
||||
lib/indexx.f90
|
||||
lib/init_random_seed.f90
|
||||
lib/interleave4.f90
|
||||
@ -430,7 +430,6 @@ set (wsjt_FSRCS
|
||||
lib/wavhdr.f90
|
||||
lib/xcor.f90
|
||||
lib/xcor4.f90
|
||||
lib/zplt.f90
|
||||
lib/wavhdr.f90
|
||||
lib/wqencode.f90
|
||||
lib/wspr_downsample.f90
|
||||
|
||||
@ -162,9 +162,8 @@ contains
|
||||
|
||||
if (have_sync) then
|
||||
decoded=decoded0
|
||||
! write(*,3001) 'A',is_deep,is_average,int(qual),ave,decoded
|
||||
!3001 format(a1,2L2,2i4,1x,a22)
|
||||
cflags='f '
|
||||
cflags=' '
|
||||
if(decoded.ne.' ') cflags='f '
|
||||
if(is_deep) then
|
||||
cflags(1:2)='d1'
|
||||
write(cflags(3:3),'(i1)') min(int(qual),9)
|
||||
|
||||
29
lib/flat1b.f90
Normal file
29
lib/flat1b.f90
Normal file
@ -0,0 +1,29 @@
|
||||
subroutine flat1b(psavg,nsmo,s2,nh,nsteps,nhmax,nsmax)
|
||||
|
||||
real psavg(nh)
|
||||
real s2(nhmax,nsmax)
|
||||
real x(8192)
|
||||
|
||||
ia=nsmo/2 + 1
|
||||
ib=nh - nsmo/2 - 1
|
||||
do i=ia,ib
|
||||
call pctile(psavg(i-nsmo/2),nsmo,50,x(i))
|
||||
enddo
|
||||
do i=1,ia-1
|
||||
x(i)=x(ia)
|
||||
enddo
|
||||
do i=ib+1,nh
|
||||
x(i)=x(ib)
|
||||
enddo
|
||||
|
||||
do i=1,nh
|
||||
psavg(i)=psavg(i)/x(i)
|
||||
do j=1,nsteps
|
||||
s2(i,j)=s2(i,j)/x(i)
|
||||
enddo
|
||||
enddo
|
||||
|
||||
return
|
||||
end subroutine flat1b
|
||||
|
||||
|
||||
@ -110,9 +110,13 @@ contains
|
||||
logical, intent(in) :: NAgain,NClearAve
|
||||
character(len=12), intent(in) :: mycall,hiscall
|
||||
character(len=6), intent(in) :: hisgrid
|
||||
|
||||
real, intent(in) :: dat(npts) !Raw data
|
||||
real z(458,65)
|
||||
|
||||
real ccfblue(-5:540) !CCF in time
|
||||
real ccfred(-224:224) !CCF in frequency
|
||||
real ps0(450)
|
||||
|
||||
! real z(458,65)
|
||||
logical first,prtavg
|
||||
character decoded*22,special*5
|
||||
character*22 avemsg,deepmsg,deepave,blank,deepmsg0,deepave1
|
||||
@ -129,7 +133,8 @@ contains
|
||||
endif
|
||||
|
||||
zz=0.
|
||||
syncmin=3.0 + minsync
|
||||
! syncmin=3.0 + minsync
|
||||
syncmin=1.0+minsync
|
||||
naggressive=0
|
||||
if(ndepth.ge.2) naggressive=1
|
||||
nq1=3
|
||||
@ -150,29 +155,14 @@ contains
|
||||
|
||||
! Attempt to synchronize: look for sync pattern, get DF and DT.
|
||||
call timer('sync4 ',0)
|
||||
call sync4(dat,npts,mode4,minw)
|
||||
mousedf=nint(nfqso + 1.5*4.375*mode4 - 1270.46)
|
||||
call sync4(dat,npts,ntol,1,MouseDF,4,mode4,minw+1,dtx,dfx, &
|
||||
snrx,snrsync,ccfblue,ccfred,flip,width,ps0)
|
||||
sync=snrsync
|
||||
dtxz=dtx-0.8
|
||||
nfreqz=dfx + 1270.46 - 1.5*4.375*mode4
|
||||
call timer('sync4 ',1)
|
||||
|
||||
call timer('zplt ',0)
|
||||
do ich=1,7
|
||||
z(1:458,1:65)=zz(274:731,1:65,ich)
|
||||
call zplt(z,ich-4,syncz,dtxz,nfreqz,flipz,sync2z,0,emedelay,dttol, &
|
||||
nfqso,ntol)
|
||||
enddo
|
||||
call timer('zplt ',1)
|
||||
|
||||
! Use results from zplt
|
||||
!### NB: JT4 is severely "sync limited" at present... (Maybe not still true???)
|
||||
|
||||
!### TESTS ONLY! ###
|
||||
nfreqz=1000
|
||||
dtxz=0.0
|
||||
flipz=1.0
|
||||
syncz=5.0
|
||||
!###
|
||||
|
||||
flip=flipz
|
||||
sync=syncz
|
||||
snrx=db(sync) - 26.
|
||||
nsnr=nint(snrx)
|
||||
if(sync.lt.syncmin) then
|
||||
@ -368,7 +358,7 @@ contains
|
||||
if(flipsave(i).lt.0.0) csync='#'
|
||||
if (associated (this%average_callback)) then
|
||||
call this%average_callback(cused(i) .eq. '$',iutc(i), &
|
||||
syncsave(i) - 5.,dtsave(i),nfsave(i),flipsave(i) .lt.0.)
|
||||
syncsave(i),dtsave(i),nfsave(i),flipsave(i).lt.0.)
|
||||
end if
|
||||
enddo
|
||||
|
||||
|
||||
240
lib/sync4.f90
240
lib/sync4.f90
@ -1,61 +1,179 @@
|
||||
subroutine sync4(dat,jz,mode4,minw)
|
||||
|
||||
! Synchronizes JT4 data, finding the best-fit DT and DF.
|
||||
|
||||
use jt4
|
||||
use timer_module, only: timer
|
||||
|
||||
parameter (NFFTMAX=2520) !Max length of FFTs
|
||||
parameter (NHMAX=NFFTMAX/2) !Max length of power spectra
|
||||
parameter (NSMAX=525) !Max number of half-symbol steps
|
||||
real dat(jz)
|
||||
real psavg(NHMAX) !Average spectrum of whole record
|
||||
real s2(NHMAX,NSMAX) !2d spectrum, stepped by half-symbols
|
||||
real tmp(1260)
|
||||
save
|
||||
|
||||
! Do FFTs of twice symbol length, stepped by half symbols. Note that
|
||||
! we have already downsampled the data by factor of 2.
|
||||
|
||||
nsym=207
|
||||
nfft=2520
|
||||
nh=nfft/2
|
||||
nq=nfft/4
|
||||
nsteps=jz/nq - 1
|
||||
df=0.5*11025.0/nfft
|
||||
psavg(1:nh)=0.
|
||||
|
||||
call timer('ps4 ',0)
|
||||
do j=1,nsteps !Compute spectrum for each step, get average
|
||||
k=(j-1)*nq + 1
|
||||
call ps4(dat(k),nfft,s2(1,j))
|
||||
psavg(1:nh)=psavg(1:nh) + s2(1:nh,j)
|
||||
enddo
|
||||
call timer('ps4 ',1)
|
||||
|
||||
call timer('flat1a ',0)
|
||||
nsmo=min(10*mode4,150)
|
||||
call flat1a(psavg,nsmo,s2,nh,nsteps,NHMAX,NSMAX) !Flatten spectra
|
||||
call timer('flat1a ',1)
|
||||
|
||||
call timer('smo ',0)
|
||||
if(mode4.ge.9) call smo(psavg,nh,tmp,mode4/4)
|
||||
call timer('smo ',1)
|
||||
|
||||
ia=600.0/df
|
||||
ib=1600.0/df
|
||||
|
||||
! ichmax=1.0+log(float(mode4))/log(2.0)
|
||||
do ich=minw+1,7 !Find best width
|
||||
kz=nch(ich)/2
|
||||
! Set istep>1 for wide submodes?
|
||||
do i=ia+kz,ib-kz !Find best frequency channel for CCF
|
||||
call timer('xcor4 ',0)
|
||||
call xcor4(s2,i,nsteps,nsym,ich,mode4)
|
||||
call timer('xcor4 ',1)
|
||||
enddo
|
||||
enddo
|
||||
|
||||
return
|
||||
end subroutine sync4
|
||||
|
||||
subroutine sync4(dat,jz,ntol,NFreeze,MouseDF,mode,mode4,minwidth, &
|
||||
dtx,dfx,snrx,snrsync,ccfblue,ccfred1,flip,width,ps0)
|
||||
|
||||
! Synchronizes JT4 data, finding the best-fit DT and DF.
|
||||
|
||||
parameter (NFFTMAX=2520) !Max length of FFTs
|
||||
parameter (NHMAX=NFFTMAX/2) !Max length of power spectra
|
||||
parameter (NSMAX=525) !Max number of half-symbol steps
|
||||
integer ntol !Range of DF search
|
||||
real dat(jz)
|
||||
real psavg(NHMAX) !Average spectrum of whole record
|
||||
real ps0(450) !Avg spectrum for plotting
|
||||
real s2(NHMAX,NSMAX) !2d spectrum, stepped by half-symbols
|
||||
real ccfblue(-5:540) !CCF with pseudorandom sequence
|
||||
real ccfred(-450:450) !Peak of ccfblue, as function of freq
|
||||
real red(-450:450) !Peak of ccfblue, as function of freq
|
||||
real ccfred1(-224:224) !Peak of ccfblue, as function of freq
|
||||
real tmp(1260)
|
||||
integer ipk1(1)
|
||||
integer nch(7)
|
||||
logical savered
|
||||
equivalence (ipk1,ipk1a)
|
||||
data nch/1,2,4,9,18,36,72/
|
||||
save
|
||||
|
||||
! write(*,3001) 'A',ntol,nfreeze,mousedf,mode,mode4,minwidth
|
||||
!3001 format(a1,6i6)
|
||||
|
||||
! Do FFTs of twice symbol length, stepped by half symbols. Note that
|
||||
! we have already downsampled the data by factor of 2.
|
||||
nsym=207
|
||||
nfft=2520
|
||||
nh=nfft/2
|
||||
nq=nfft/4
|
||||
nsteps=jz/nq - 1
|
||||
df=0.5*11025.0/nfft
|
||||
psavg(1:nh)=0.
|
||||
if(mode.eq.-999) width=0. !Silence compiler warning
|
||||
|
||||
do j=1,nsteps !Compute spectrum for each step, get average
|
||||
k=(j-1)*nq + 1
|
||||
call ps4(dat(k),nfft,s2(1,j))
|
||||
psavg(1:nh)=psavg(1:nh) + s2(1:nh,j)
|
||||
enddo
|
||||
|
||||
nsmo=min(10*mode4,150)
|
||||
call flat1b(psavg,nsmo,s2,nh,nsteps,NHMAX,NSMAX) !Flatten spectra
|
||||
|
||||
if(mode4.ge.9) call smo(psavg,nh,tmp,mode4/4)
|
||||
|
||||
i0=132
|
||||
do i=1,450
|
||||
ps0(i)=5.0*(psavg(i0+2*i) + psavg(i0+2*i+1) - 2.0)
|
||||
enddo
|
||||
|
||||
! Set freq and lag ranges
|
||||
famin=200.0 + 3*mode4*df
|
||||
fbmax=2700.0 - 3*mode4*df
|
||||
fa=famin
|
||||
fb=fbmax
|
||||
if(NFreeze.eq.1) then
|
||||
fa=max(famin,1270.46+MouseDF-ntol)
|
||||
fb=min(fbmax,1270.46+MouseDF+ntol)
|
||||
else
|
||||
fa=max(famin,1270.46+MouseDF-600)
|
||||
fb=min(fbmax,1270.46+MouseDF+600)
|
||||
endif
|
||||
ia=fa/df - 3*mode4 !Index of lowest tone, bottom of range
|
||||
ib=fb/df - 3*mode4 !Index of lowest tone, top of range
|
||||
i0=nint(1270.46/df)
|
||||
irange=450
|
||||
if(ia-i0.lt.-irange) ia=i0-irange
|
||||
if(ib-i0.gt.irange) ib=i0+irange
|
||||
lag1=-5
|
||||
lag2=59
|
||||
syncbest=-1.e30
|
||||
ccfred=0.
|
||||
jmax=-1000
|
||||
jmin=1000
|
||||
|
||||
do ich=minwidth,7 !Find best width
|
||||
kz=nch(ich)/2
|
||||
savered=.false.
|
||||
do i=ia+kz,ib-kz !Find best frequency channel for CCF
|
||||
call xcor4(s2,i,nsteps,nsym,lag1,lag2,ich,mode4,ccfblue,ccf0, &
|
||||
lagpk0,flip)
|
||||
j=i-i0 + 3*mode4
|
||||
if(j.ge.-372 .and. j.le.372) then
|
||||
ccfred(j)=ccf0
|
||||
jmax=max(j,jmax)
|
||||
jmin=min(j,jmin)
|
||||
endif
|
||||
|
||||
! Find rms of the CCF, without main peak
|
||||
call slope(ccfblue(lag1),lag2-lag1+1,lagpk0-lag1+1.0)
|
||||
sync=abs(ccfblue(lagpk0))
|
||||
|
||||
! Find best sync value
|
||||
if(sync.gt.syncbest) then
|
||||
ipk=i
|
||||
lagpk=lagpk0
|
||||
ichpk=ich
|
||||
syncbest=sync
|
||||
savered=.true.
|
||||
endif
|
||||
enddo
|
||||
if(savered) red=ccfred
|
||||
enddo
|
||||
|
||||
ccfred=red
|
||||
! width=df*nch(ichpk)
|
||||
dfx=(ipk-i0 + 3*mode4)*df
|
||||
|
||||
! Peak up in time, at best whole-channel frequency
|
||||
call xcor4(s2,ipk,nsteps,nsym,lag1,lag2,ichpk,mode4,ccfblue,ccfmax, &
|
||||
lagpk,flip)
|
||||
xlag=lagpk
|
||||
if(lagpk.gt.lag1 .and. lagpk.lt.lag2) then
|
||||
call peakup(ccfblue(lagpk-1),ccfmax,ccfblue(lagpk+1),dx2)
|
||||
xlag=lagpk+dx2
|
||||
endif
|
||||
|
||||
! Find rms of the CCF, without the main peak
|
||||
call slope(ccfblue(lag1),lag2-lag1+1,xlag-lag1+1.0)
|
||||
sq=0.
|
||||
nsq=0
|
||||
do lag=lag1,lag2
|
||||
if(abs(lag-xlag).gt.2.0) then
|
||||
sq=sq+ccfblue(lag)**2
|
||||
nsq=nsq+1
|
||||
endif
|
||||
enddo
|
||||
rms=sqrt(sq/nsq)
|
||||
snrsync=max(0.0,db(abs(ccfblue(lagpk)/rms - 1.0)) - 4.5)
|
||||
snrx=-26.
|
||||
if(mode4.eq.2) snrx=-25.
|
||||
if(mode4.eq.4) snrx=-24.
|
||||
if(mode4.eq.9) snrx=-23.
|
||||
if(mode4.eq.18) snrx=-22.
|
||||
if(mode4.eq.36) snrx=-21.
|
||||
if(mode4.eq.72) snrx=-20.
|
||||
snrx=snrx + snrsync
|
||||
|
||||
dt=2.0/11025.0
|
||||
istart=xlag*nq
|
||||
dtx=istart*dt
|
||||
ccfred1=0.
|
||||
jmin=max(jmin,-224)
|
||||
jmax=min(jmax,224)
|
||||
do i=jmin,jmax
|
||||
ccfred1(i)=ccfred(i)
|
||||
enddo
|
||||
|
||||
ipk1=maxloc(ccfred1) - 225
|
||||
ns=0
|
||||
s=0.
|
||||
iw=min(mode4,(ib-ia)/4)
|
||||
do i=jmin,jmax
|
||||
if(abs(i-ipk1a).gt.iw) then
|
||||
s=s+ccfred1(i)
|
||||
ns=ns+1
|
||||
endif
|
||||
enddo
|
||||
base=s/ns
|
||||
ccfred1=ccfred1-base
|
||||
ccf10=0.5*maxval(ccfred1)
|
||||
do i=ipk1a,jmin,-1
|
||||
if(ccfred1(i).le.ccf10) exit
|
||||
enddo
|
||||
i1=i
|
||||
do i=ipk1a,jmax
|
||||
if(ccfred1(i).le.ccf10) exit
|
||||
enddo
|
||||
width=(i-i1)*df
|
||||
|
||||
return
|
||||
end subroutine sync4
|
||||
|
||||
include 'flat1b.f90'
|
||||
|
||||
144
lib/xcor4.f90
144
lib/xcor4.f90
@ -1,49 +1,95 @@
|
||||
subroutine xcor4(s2,ipk,nsteps,nsym,ich,mode4)
|
||||
|
||||
! Computes ccf of the 4-FSK spectral array s2 and the pseudo-random
|
||||
! array pr2. Returns peak of CCF and the lag at which peak occurs.
|
||||
! The CCF peak may be either positive or negative, with negative
|
||||
! implying a message with report.
|
||||
|
||||
use jt4
|
||||
parameter (NHMAX=1260) !Max length of power spectra
|
||||
parameter (NSMAX=525) !Max number of half-symbol steps
|
||||
real s2(NHMAX,NSMAX) !2d spectrum, stepped by half-symbols
|
||||
real a(NSMAX)
|
||||
save
|
||||
|
||||
nw=nch(ich)
|
||||
do j=1,nsteps
|
||||
n=2*mode4
|
||||
if(mode4.eq.1) then
|
||||
a(j)=max(s2(ipk+n,j),s2(ipk+3*n,j)) - max(s2(ipk ,j),s2(ipk+2*n,j))
|
||||
else
|
||||
kz=max(1,nw/2)
|
||||
ss0=0.
|
||||
ss1=0.
|
||||
ss2=0.
|
||||
ss3=0.
|
||||
wsum=0.
|
||||
do k=-kz+1,kz-1
|
||||
w=float(kz-iabs(k))/nw
|
||||
wsum=wsum+w
|
||||
ss0=ss0 + w*s2(ipk +k,j)
|
||||
ss1=ss1 + w*s2(ipk+ n+k,j)
|
||||
ss2=ss2 + w*s2(ipk+2*n+k,j)
|
||||
ss3=ss3 + w*s2(ipk+3*n+k,j)
|
||||
enddo
|
||||
a(j)=(max(ss1,ss3) - max(ss0,ss2))/sqrt(wsum)
|
||||
endif
|
||||
enddo
|
||||
|
||||
do lag=1,65
|
||||
x=0.
|
||||
do i=1,nsym
|
||||
j=2*i-1+lag
|
||||
if(j.ge.1 .and. j.le.nsteps) x=x+a(j)*float(2*npr(i)-1)
|
||||
enddo
|
||||
zz(ipk,lag,ich)=x
|
||||
enddo
|
||||
|
||||
return
|
||||
end subroutine xcor4
|
||||
subroutine xcor4(s2,ipk,nsteps,nsym,lag1,lag2,ich,mode4,ccf,ccf0, &
|
||||
lagpk,flip)
|
||||
|
||||
! Computes ccf of the 4_FSK spectral array s2 and the pseudo-random
|
||||
! array pr2. Returns peak of CCF and the lag at which peak occurs.
|
||||
! The CCF peak may be either positive or negative, with negative
|
||||
! implying the "OOO" message.
|
||||
|
||||
parameter (NHMAX=1260) !Max length of power spectra
|
||||
parameter (NSMAX=525) !Max number of half-symbol steps
|
||||
real s2(NHMAX,NSMAX) !2d spectrum, stepped by half-symbols
|
||||
real a(NSMAX)
|
||||
real ccf(-5:540)
|
||||
integer nch(7)
|
||||
integer npr2(207)
|
||||
real pr2(207)
|
||||
logical first
|
||||
data lagmin/0/ !Silence compiler warning
|
||||
data first/.true./
|
||||
data npr2/ &
|
||||
0,0,0,0,1,1,0,0,0,1,1,0,1,1,0,0,1,0,1,0,0,0,0,0,0,0,1,1,0,0, &
|
||||
0,0,0,0,0,0,0,0,0,0,1,0,1,1,0,1,1,0,1,0,1,1,1,1,1,0,1,0,0,0, &
|
||||
1,0,0,1,0,0,1,1,1,1,1,0,0,0,1,0,1,0,0,0,1,1,1,1,0,1,1,0,0,1, &
|
||||
0,0,0,1,1,0,1,0,1,0,1,0,1,0,1,1,1,1,1,0,1,0,1,0,1,1,0,1,0,1, &
|
||||
0,1,1,1,0,0,1,0,1,1,0,1,1,1,1,0,0,0,0,1,1,0,1,1,0,0,0,1,1,1, &
|
||||
0,1,1,1,0,1,1,1,0,0,1,0,0,0,1,1,0,1,1,0,0,1,0,0,0,1,1,1,1,1, &
|
||||
1,0,0,1,1,0,0,0,0,1,1,0,0,0,1,0,1,1,0,1,1,1,1,0,1,0,1/
|
||||
data nch/1,2,4,9,18,36,72/
|
||||
save
|
||||
|
||||
if(first) then
|
||||
do i=1,207
|
||||
pr2(i)=2*npr2(i)-1
|
||||
enddo
|
||||
first=.false.
|
||||
endif
|
||||
|
||||
ccfmax=0.
|
||||
ccfmin=0.
|
||||
nw=nch(ich)
|
||||
|
||||
do j=1,nsteps
|
||||
n=2*mode4
|
||||
if(mode4.eq.1) then
|
||||
a(j)=max(s2(ipk+n,j),s2(ipk+3*n,j)) - max(s2(ipk ,j),s2(ipk+2*n,j))
|
||||
else
|
||||
kz=max(1,nw/2)
|
||||
ss0=0.
|
||||
ss1=0.
|
||||
ss2=0.
|
||||
ss3=0.
|
||||
wsum=0.
|
||||
do k=-kz+1,kz-1
|
||||
w=float(kz-iabs(k))/nw
|
||||
wsum=wsum+w
|
||||
ss0=ss0 + w*s2(ipk +k,j)
|
||||
ss1=ss1 + w*s2(ipk+ n+k,j)
|
||||
ss2=ss2 + w*s2(ipk+2*n+k,j)
|
||||
ss3=ss3 + w*s2(ipk+3*n+k,j)
|
||||
enddo
|
||||
a(j)=(max(ss1,ss3) - max(ss0,ss2))/sqrt(wsum)
|
||||
endif
|
||||
enddo
|
||||
|
||||
do lag=lag1,lag2
|
||||
x=0.
|
||||
do i=1,nsym
|
||||
j=2*i-1+lag
|
||||
if(j.ge.1 .and. j.le.nsteps) x=x+a(j)*pr2(i)
|
||||
enddo
|
||||
ccf(lag)=2*x !The 2 is for plotting scale
|
||||
if(ccf(lag).gt.ccfmax) then
|
||||
ccfmax=ccf(lag)
|
||||
lagpk=lag
|
||||
endif
|
||||
|
||||
if(ccf(lag).lt.ccfmin) then
|
||||
ccfmin=ccf(lag)
|
||||
lagmin=lag
|
||||
endif
|
||||
enddo
|
||||
|
||||
ccf0=ccfmax
|
||||
flip=1.0
|
||||
if(-ccfmin.gt.ccfmax) then
|
||||
do lag=lag1,lag2
|
||||
ccf(lag)=-ccf(lag)
|
||||
enddo
|
||||
lagpk=lagmin
|
||||
ccf0=-ccfmin
|
||||
flip=-1.0
|
||||
endif
|
||||
|
||||
return
|
||||
end subroutine xcor4
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user