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QRA65 now decodes using qra_loops() -- the same inner loops as QRA64. Very effective!

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This commit is contained in:
Joe Taylor 2020-10-08 16:48:11 -04:00
parent 5e23f88f7e
commit c5502cda05
6 changed files with 112 additions and 137 deletions
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5
CMakeLists.txt
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@ -570,7 +570,6 @@ set (wsjt_FSRCS
lib/softsym9w.f90
lib/shell.f90
lib/spec64.f90
lib/spec_qra65.f90
lib/spec9f.f90
lib/stdmsg.f90
lib/subtract65.f90
@ -1317,7 +1316,7 @@ if (${OPENMP_FOUND} OR APPLE)
endif (APPLE)
if (WIN32)
set_target_properties (jt9 PROPERTIES
LINK_FLAGS -Wl,--stack,16777216
LINK_FLAGS -Wl,--stack,28000000
)
endif ()
target_link_libraries (jt9 wsjt_fort_omp wsjt_cxx fort_qt)
@ -1454,7 +1453,7 @@ else ()
)
if (WIN32)
set_target_properties (wsjtx PROPERTIES
LINK_FLAGS -Wl,--stack,16777216
LINK_FLAGS -Wl,--stack,28000000
)
endif ()
endif ()

5
lib/ana64.f90
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@ -3,13 +3,12 @@ subroutine ana64(dd,npts,c0)
use timer_module, only: timer
parameter (NMAX=60*12000) !Max size of raw data at 12000 Hz
parameter (NSPS=3456) !Samples per symbol at 6000 Hz
parameter (NSPC=7*NSPS) !Samples per Costas array
real dd(NMAX) !Raw data
complex c0(0:720000) !Complex spectrum of dd()
save
nfft1=672000
! nfft1=672000
nfft1=720000
nfft2=nfft1/2
df1=12000.0/nfft1
fac=2.0/nfft1

2
lib/qra64a.f90
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@ -81,8 +81,6 @@ subroutine qra64a(dd,npts,nf1,nf2,nfqso,ntol,mode64,minsync,ndepth, &
snr2=0.
endif
nfreq=nint(f0)
write(71,3071) idf,idt,ncall,irc,nsnr,dtx,nfreq,decoded
3071 format(5i5,f7.2,i6,2x,a22)
900 if(irc.lt.0) then
sy=max(1.0,sync)

77
lib/qra65_decode.f90
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@ -41,18 +41,20 @@ contains
character(len=6) :: hisgrid
character*37 decoded
integer*2 iwave(NMAX) !Raw data
real dd(NMAX) !Raw data
integer dat4(12)
logical lapdx,ltext
complex, allocatable :: c00(:) !Analytic signal, 6000 S/s
complex, allocatable :: c0(:) !Analytic signal, 6000 S/s
real, allocatable, save :: s3(:,:) !Symbol spectra
real, allocatable, save :: s3a(:,:) !Symbol spectra for avg messages
real a(5)
data nc1z/-1/,nc2z/-1/,ng2z/-1/,maxaptypez/-1/,nsubmodez/-1/
save nc1z,nc2z,ng2z,maxaptypez,nsave,nsubmodez
mode65=2**nsubmode
nfft1=ntrperiod*12000
nfft2=ntrperiod*6000
allocate (c00(0:nfft1-1))
allocate (c0(0:nfft1-1))
if(nsubmode.ne.nsubmodez) then
@ -75,16 +77,10 @@ contains
else
stop 'Invalid TR period'
endif
npts=ntrperiod*12000
baud=12000.0/nsps
df1=12000.0/nfft1
! do i=1,12000*ntrperiod
! write(61,3061) i/12000.0,iwave(i)/32767.0
!3061 format(2f12.6)
! enddo
this%callback => callback
if(nutc.eq.-999) print*,lapdx,nfa,nfb,nfqso !Silence warning
! Prime the QRA decoder for possible use of AP
@ -119,61 +115,22 @@ contains
call sync_qra65(iwave,ntrperiod*12000,mode65,nsps,nfqso,ntol,xdt,f0,snr1)
call timer('sync_q65',1)
! Downsample to give complex data at 6000 S/s
call timer('down_q65',0)
fac=2.0/nfft1
c0=fac*iwave(1:nfft1)
call four2a(c0,nfft1,1,-1,1) !Forward c2c FFT
c0(nfft2/2+1:nfft2)=0. !Zero the top half
c0(0)=0.5*c0(0)
call four2a(c0,nfft2,1,1,1) !Inverse c2c FFT
a=0.
a(1)=-(f0 + mode65*baud) !Data tones start mode65 bins higher
call twkfreq(c0,c0,ntrperiod*6000,6000.0,a)
call timer('down_q65',1)
jpk0=(xdt+1.0)*6000 !###
if(jpk0.lt.0) jpk0=0
jpk=(xdt+0.5)*6000 - 384 !### Empirical ###
if(ntrperiod.ge.60) jpk=(xdt+1.0)*6000 - 384 !### TBD ??? ###
if(jpk.lt.0) jpk=0
xdt=jpk/6000.0 - 0.5
LL=64*(mode65+2)
NN=63
call timer('spec_q65',0)
call spec_qra65(c0(jpk:),nsps/2,s3,LL,NN) !Compute synced symbol spectra
call timer('spec_q65',1)
fac=1.0/32767.0
dd=fac*iwave
! npts=648000
minsync=-2
nmode=65
do j=1,63 !Normalize to symbol baseline
call pctile(s3(:,j),LL,40,base)
s3(:,j)=s3(:,j)/base
enddo
call ana64(dd,npts,c00)
LL2=64*(mode65+1)-1
s3max=20.0
do j=1,63 !Apply AGC to suppress pings
xx=maxval(s3(-64:LL2,j))
if(xx.gt.s3max) s3(-64:LL2,j)=s3(-64:LL2,j)*s3max/xx
enddo
! Call Nico's QRA64 decoder
call timer('qra64_de',0)
call qra64_dec(s3,nc1,nc2,ng2,naptype,0,nSubmode,b90, &
nFadingModel,dat4,snr2,irc)
call timer('qra64_de',1)
if(irc.lt.0) then
! No luck so far. Try for an average decode.
call timer('qra64_av',0)
s3a=s3a+s3
nsave=nsave+1
if(nsave.ge.2) then
call qra64_dec(s3a,nc1,nc2,ng2,naptype,0,nSubmode,b90, &
nFadingModel,dat4,snr2,irc)
if(irc.ge.0) irc=100*nsave + irc
endif
call timer('qra64_av',1)
endif
snr2=snr2 + db(6912.0/nsps)
if(irc.gt.0) call badmsg(irc,dat4,nc1,nc2,ng2)
call timer('qraloops',0)
call qra_loops(c00,npts/2,nmode,mode65,nsubmode,nFadingModel,minsync, &
ndepth,nc1,nc2,ng2,naptype,jpk0,xdt,f0,width,snr2,s3,irc,dat4)
if(nmode.eq.65) xdt=xdt+0.4 !### Empirical WHY ??? ###
call timer('qraloops',1)
decoded=' '
if(irc.ge.0) then

27
lib/qra_loops.f90
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@ -1,5 +1,5 @@
subroutine qra_loops(c00,npts2,mode,mode64,nsubmode,nFadingModel,minsync, &
ndepth,nc1,nc2,ng2,naptype,jpk0,dtx,f0,width,snr2,s3,irc,dat4)
ndepth,nc1,nc2,ng2,naptype,jpk0,xdt,f0,width,snr2,s3,irc,dat4)
use timer_module, only: timer
parameter (LN=1152*63)
@ -10,7 +10,6 @@ subroutine qra_loops(c00,npts2,mode,mode64,nsubmode,nFadingModel,minsync, &
integer dat4(12),dat4x(12) !Decoded message (as 12 integers)
integer nap(0:11) !AP return codes
data nap/0,2,3,2,3,4,2,3,6,4,6,6/
! save
irc=-99
s3lim=20.
@ -26,6 +25,8 @@ subroutine qra_loops(c00,npts2,mode,mode64,nsubmode,nFadingModel,minsync, &
NN=63
napmin=99
ncall=0
nsps=3456 !QRA64
if(mode.eq.65) nsps=3840 !QRA65
do idf0=1,11
idf=idf0/2
@ -37,24 +38,8 @@ subroutine qra_loops(c00,npts2,mode,mode64,nsubmode,nFadingModel,minsync, &
idt=idt0/2
if(mod(idt0,2).eq.0) idt=-idt
jpk=jpk0 + 750*idt
if(mode.eq.64) then
call spec64(c0,jpk,s3a,LL,NN)
else
if(jpk.lt.0) jpk=0
call timer('spec_q65',0)
call spec_qra65(c0(jpk:),nsps2,s3,LL,NN) !Get synced symbol spectra
call timer('spec_q65',1)
! do j=1,63 !Normalize to symbol baseline
! call pctile(s3(:,j),LL,40,base)
! s3(:,j)=s3(:,j)/base
! enddo
! LL2=64*(mode65+1)-1
! s3max=20.0
! do j=1,63 !Apply AGC to suppress pings
! xx=maxval(s3(-64:LL2,j))
! if(xx.gt.s3max) s3(-64:LL2,j)=s3(-64:LL2,j)*s3max/xx
! enddo
endif
call spec64(c0,nsps,mode,jpk,s3a,LL,NN)
call pctile(s3a,LL*NN,40,base)
s3a=s3a/base
where(s3a(1:LL*NN)>s3lim) s3a(1:LL*NN)=s3lim
@ -77,7 +62,7 @@ subroutine qra_loops(c00,npts2,mode,mode64,nsubmode,nFadingModel,minsync, &
snr2x=snr2
napmin=nap(iirc)
irckeep=irc
dtxkeep=jpk/6000.0 - 1.0
xdtkeep=jpk/6000.0 - 1.0
f0keep=-a(1)
idfkeep=idf
idtkeep=idt
@ -94,7 +79,7 @@ subroutine qra_loops(c00,npts2,mode,mode64,nsubmode,nFadingModel,minsync, &
b90=b90x
snr2=snr2x
irc=irckeep
dtx=dtxkeep
xdt=xdtkeep
f0=f0keep
idt=idtkeep
idf=idfkeep

43
lib/spec64.f90
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@ -1,13 +1,17 @@
subroutine spec64(c0,jpk,s3,LL,NN)
subroutine spec64(c0,nsps,mode,jpk,s3,LL,NN)
parameter (NSPS=3456) !Samples per symbol at 6000 Hz
parameter (MAXFFT=3840)
complex c0(0:360000) !Complex spectrum of dd()
complex cs(0:NSPS-1) !Complex symbol spectrum
complex cs(0:MAXFFT-1) !Complex symbol spectrum
real s3(LL,NN) !Synchronized symbol spectra
real xbase0(LL),xbase(LL)
integer isync(22) !Indices of sync symbols
data isync/1,9,12,13,15,22,23,26,27,33,35,38,46,50,55,60,62,66,69,74,76,85/
nfft=nsps
fac=1.0/nfft
if(mode.eq.64) then
do j=1,NN
jj=j+7 !Skip first Costas array
if(j.ge.33) jj=j+14 !Skip middle Costas array
@ -21,6 +25,26 @@ subroutine spec64(c0,jpk,s3,LL,NN)
s3(ii,j)=real(cs(i))**2 + aimag(cs(i))**2
enddo
enddo
else
j=0
n=1
do k=1,84
if(k.eq.isync(n)) then
n=n+1
cycle
endif
j=j+1
ja=(k-1)*nsps + jpk
jb=ja+nsps-1
cs(0:nfft-1)=fac*c0(ja:jb)
call four2a(cs,nsps,1,-1,1) !c2c FFT to frequency
do ii=1,LL
i=ii-65
if(i.lt.0) i=i+nsps
s3(ii,j)=real(cs(i))**2 + aimag(cs(i))**2
enddo
enddo
endif
df=6000.0/nfft
do i=1,LL
@ -38,5 +62,18 @@ subroutine spec64(c0,jpk,s3,LL,NN)
s3(i,1:NN)=s3(i,1:NN)/(xbase(i)+0.001) !Apply frequency equalization
enddo
! print*,'a',LL,NN,jpk
! df=6000.0/nfft
! do i=1,LL
! write(71,3071) i,i-65,i*df,(s3(i,j),j=1,4)
!3071 format(2i8,f10.3,4e12.3)
! enddo
!
! do j=1,NN
! write(72,3072) j,maxloc(s3(1:LL,j)),maxloc(s3(1:LL,j))-65
!3072 format(3i8)
! enddo
! if(nfft.ne.-999) stop
return
end subroutine spec64