WSJT-X/map65/libm65/q65b.f90

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5.9 KiB
Fortran
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subroutine q65b(nutc,nqd,nxant,fcenter,nfcal,nfsample,ikhz,mousedf,ntol,xpol, &
mycall0,mygrid,hiscall0,hisgrid,mode_q65,f0,fqso,newdat,nagain, &
max_drift,nhsym,idec)
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! This routine provides an interface between MAP65 and the Q65 decoder
! in WSJT-X. All arguments are input data obtained from the MAP65 GUI.
! Raw Rx data are available as the 96 kHz complex spectrum ca(MAXFFT1)
! in common/cacb. If xpol is true, we also have cb(MAXFFT1) for the
! orthogonal polarization. Decoded messages are sent back to the GUI
! on stdout.
! use wavhdr
use q65_decode
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use wideband_sync
use timer_module, only: timer
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parameter (MAXFFT1=5376000) !56*96000
parameter (MAXFFT2=336000) !56*6000 (downsampled by 1/16)
parameter (NMAX=60*12000)
parameter (RAD=57.2957795)
! type(hdr) h !Header for the .wav file
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integer*2 iwave(60*12000)
complex ca(MAXFFT1),cb(MAXFFT1) !FFTs of raw x,y data
complex cx(0:MAXFFT2-1),cy(0:MAXFFT2-1),cz(0:MAXFFT2)
logical xpol,ldecoded
integer ipk1(1)
real*8 fcenter,freq0,freq1
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character*12 mycall0,hiscall0
character*12 mycall,hiscall
character*6 mygrid,hisgrid
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character*4 grid4
character*28 msg00
character*80 line
character*80 wsjtx_dir
character*1 cp,cmode*2
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common/cacb/ca,cb
common/early/nhsym1,nhsym2,ldecoded(32768)
data nutc00/-1/,msg00/' '/
save
if(newdat.eq.1) nutc00=-1
open(9,file='wsjtx_dir.txt',status='old')
read(9,'(a)') wsjtx_dir !Establish the working directory
close(9)
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if(mycall0(1:1).ne.' ') mycall=mycall0
if(hiscall0(1:1).ne.' ') hiscall=hiscall0
if(hisgrid(1:4).ne.' ') grid4=hisgrid(1:4)
! Find best frequency and ipol from sync_dat, the "orange sync curve".
df3=96000.0/32768.0
ifreq=nint((1000.0*f0)/df3)
ia=nint(ifreq-ntol/df3)
ib=nint(ifreq+ntol/df3)
ipk1=maxloc(sync(ia:ib)%ccfmax)
ipk=ia+ipk1(1)-1
if(ldecoded(ipk)) go to 900
snr1=sync(ipk)%ccfmax
ipol=1
if(xpol) ipol=sync(ipk)%ipol
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nfft1=MAXFFT1
nfft2=MAXFFT2
df=96000.0/NFFT1
if(nfsample.eq.95238) then
nfft1=5120000
nfft2=322560
df=96000.0/nfft1
endif
nh=nfft2/2
f_mouse=1000.0*(fqso+48.0) + mousedf
f_ipk=ipk*df3
k0=nint((ipk*df3-1000.0)/df)
if(nagain.eq.1) k0=nint((f_mouse-1000.0)/df)
if(k0.lt.nh .or. k0.gt.MAXFFT1-nfft2+1) go to 900
if(snr1.lt.1.5) go to 900 !### Threshold needs work? ###
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fac=1.0/nfft2
cx(0:nfft2-1)=ca(k0:k0+nfft2-1)
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cx=fac*cx
if(xpol) then
cy(0:nfft2-1)=cb(k0:k0+nfft2-1)
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cy=fac*cy
endif
! Here cx and cy (if xpol) are frequency-domain data around the selected
! QSO frequency, taken from the full-length FFT computed in filbig().
! Values for fsample, nfft1, nfft2, df, and the downsampled data rate
! are as follows:
! fSample nfft1 df nfft2 fDownSampled
! (Hz) (Hz) (Hz)
!----------------------------------------------------
! 96000 5376000 0.017857143 336000 6000.000
! 95238 5120000 0.018601172 322560 5999.994
poldeg=0.
if(xpol) then
poldeg=sync(ipk)%pol
cz(0:MAXFFT2-1)=cos(poldeg/RAD)*cx + sin(poldeg/RAD)*cy
else
cz(0:MAXFFT2-1)=cx
endif
cz(MAXFFT2)=0.
! Roll off below 500 Hz and above 2500 Hz.
ja=nint(500.0/df)
jb=nint(2500.0/df)
do i=0,ja
r=0.5*(1.0+cos(i*3.14159/ja))
cz(ja-i)=r*cz(ja-i)
cz(jb+i)=r*cz(jb+i)
enddo
cz(ja+jb+1:)=0.
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!Transform to time domain (real), fsample=12000 Hz
call four2a(cz,2*nfft2,1,1,-1)
do i=0,nfft2-1
j=nfft2-1-i
iwave(2*i+2)=nint(real(cz(j))) !Note the reversed order!
iwave(2*i+1)=nint(aimag(cz(j)))
enddo
iwave(2*nfft2+1:)=0
! open(30,file='000000_0001.wav',status='unknown',access='stream')
! h=default_header(12000,NMAX)
! write(30) h,iwave
! close(30)
nsubmode=mode_q65-1
nfa=990 !Tight limits around ipk for the wideband decode
nfb=1010
if(nagain.eq.1) then !For nagain=1, use limits of +/- ntol
nfa=max(100,1000-ntol)
nfb=min(2500,1000+ntol)
endif
nsnr0=-99 !Default snr for no decode
! NB: Frequency of ipk is now shifted to 1000 Hz.
call map65_mmdec(nutc,iwave,nqd,nsubmode,nfa,nfb,1000,ntol, &
newdat,nagain,max_drift,mycall,hiscall,hisgrid)
MHz=fcenter
freq0=MHz + 0.001d0*ikhz
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if(nsnr0.gt.-99) then
ldecoded(ipk)=.true.
nq65df=nint(1000*(0.001*k0*df+nkhz_center-48.0+1.000-1.27046-ikhz))-nfcal
nq65df=nq65df + nfreq0 - 1000
npol=nint(poldeg)
if(nxant.ne.0) then
npol=npol-45
if(npol.lt.0) npol=npol+180
endif
call txpol(xpol,msg0(1:22),mygrid,npol,nxant,ntxpol,cp)
ikhz1=ikhz
ndf=nq65df
if(ndf.gt.500) ikhz1=ikhz + (nq65df+500)/1000
if(ndf.lt.-500) ikhz1=ikhz + (nq65df-500)/1000
ndf=nq65df - 1000*(ikhz1-ikhz)
if(nqd.eq.1 .and. abs(nq65df-mousedf).lt.ntol) then
write(line,1020) ikhz1,ndf,npol,nutc,xdt0,nsnr0,msg0(1:27),cq0, &
ntxpol,cp
1020 format('!',i3.3,i5,i4,i6.4,f5.1,i5,' : ',a27,a3,i4,1x,a1)
write(*,1100) trim(line)
1100 format(a)
endif
! Write to lu 26, for Messages and Band Map windows
cmode=': '
cmode(2:2)=char(ichar('A') + mode_q65-1)
freq1=freq0 + 0.001d0*(ikhz1-ikhz)
write(26,1014) freq1,ndf,0,0,0,xdt0,npol,0,nsnr0,nutc,msg0(1:22), &
':',cp,cmode
1014 format(f8.3,i5,3i3,f5.1,i4,i3,i4,i5.4,4x,a22,1x,2a1,2x,a2)
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! Suppress writing duplicates (same time, decoded message, and frequency)
! to map65_rx.log
if(nutc.ne.nutc00 .or. msg0(1:28).ne.msg00 .or. freq1.ne.freq1_00) then
! Write to file map65_rx.log:
write(21,1110) freq1,ndf,xdt0,npol,nsnr0,nutc,msg0(1:28),cq0
1110 format(f8.3,i5,f5.1,2i4,i5.4,2x,a28,': A',2x,a3)
nutc00=nutc
msg00=msg0(1:28)
freq1_00=freq1
endif
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endif
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900 close(13)
close(17)
call flush(6)
idec=-1
read(cq0(2:2),*) idec
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return
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end subroutine q65b