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https://github.com/saitohirga/WSJT-X.git
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163 lines
5.3 KiB
Fortran
163 lines
5.3 KiB
Fortran
module q65_decode
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type :: q65_decoder
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procedure(q65_decode_callback), pointer :: callback
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contains
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procedure :: decode
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end type q65_decoder
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abstract interface
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subroutine q65_decode_callback (this,nutc,sync,nsnr,dt,freq, &
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decoded,nap,qual,ntrperiod,fmid,w50)
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import q65_decoder
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implicit none
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class(q65_decoder), intent(inout) :: this
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integer, intent(in) :: nutc
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real, intent(in) :: sync
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integer, intent(in) :: nsnr
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real, intent(in) :: dt
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real, intent(in) :: freq
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character(len=37), intent(in) :: decoded
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integer, intent(in) :: nap
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real, intent(in) :: qual
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integer, intent(in) :: ntrperiod
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real, intent(in) :: fmid
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real, intent(in) :: w50
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end subroutine q65_decode_callback
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end interface
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contains
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subroutine decode(this,callback,iwave,nutc,ntrperiod,nsubmode,nfqso, &
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ntol,ndepth,mycall,hiscall,hisgrid)
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! Decodes Q65 signals
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! Input: iwave Raw data, i*2
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! nutc UTC for time-tagging the decode
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! ntrperiod T/R sequence length (s)
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! nsubmode Tone-spacing indicator, 0-4 for A-E
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! nfqso Target signal frequency (Hz)
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! ntol Search range around nfqso (Hz)
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! ndepth Optional decoding level (???)
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! Output: sent to the callback routine for display to user
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use timer_module, only: timer
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use packjt
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use, intrinsic :: iso_c_binding
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parameter (NMAX=300*12000) !Max TRperiod is 300 s
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class(q65_decoder), intent(inout) :: this
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procedure(q65_decode_callback) :: callback
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character(len=12) :: mycall, hiscall !Used for AP decoding
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character(len=6) :: hisgrid
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character*37 decoded !Decoded message
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integer*2 iwave(NMAX) !Raw data
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real, allocatable :: dd(:) !Raw data
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integer dat4(12) !Decoded message as 12 6-bit integers
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logical ltext
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complex, allocatable :: c00(:) !Analytic signal, 6000 Sa/s
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complex, allocatable :: c0(:) !Analytic signal, 6000 Sa/s
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data nc1z/-1/,nc2z/-1/,ng2z/-1/,maxaptypez/-1/,nsubmodez/-1/
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save nc1z,nc2z,ng2z,maxaptypez,nsubmodez
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mode65=2**nsubmode
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nfft1=ntrperiod*12000
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nfft2=ntrperiod*6000
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allocate(dd(NMAX))
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allocate (c00(0:nfft1-1))
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allocate (c0(0:nfft1-1))
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if(ntrperiod.eq.15) then
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nsps=1800
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else if(ntrperiod.eq.30) then
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nsps=3600
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else if(ntrperiod.eq.60) then
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nsps=7200
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else if(ntrperiod.eq.120) then
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nsps=16000
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else if(ntrperiod.eq.300) then
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nsps=41472
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else
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stop 'Invalid TR period'
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endif
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npts=ntrperiod*12000
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baud=12000.0/nsps
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df1=12000.0/nfft1
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this%callback => callback
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if(nutc.eq.-999) print*,lapdx,nfa,nfb,nfqso !Silence warning
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! Prime the QRA decoder for possible use of AP
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call packcall(mycall(1:6),nc1,ltext)
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call packcall(hiscall(1:6),nc2,ltext)
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call packgrid(hisgrid(1:4),ng2,ltext)
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b90=20.0 !8 to 25 is OK; not very critical
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nFadingModel=1
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! AP control could be done differently, but this works well:
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maxaptype=0
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! if(ndepth.eq.2) maxaptype=3
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! if(ndepth.eq.3) maxaptype=5
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if(ndepth.ge.2) maxaptype=5 !###
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minsync=-2
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call qra_params(ndepth,maxaptype,idfmax,idtmax,ibwmin,ibwmax,maxdist)
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if(nc1.ne.nc1z .or. nc2.ne.nc2z .or. ng2.ne.ng2z .or. &
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maxaptype.ne.maxaptypez) then
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do naptype=0,maxaptype
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if(naptype.eq.2 .and. maxaptype.eq.4) cycle
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call qra64_dec(s3dummy,nc1,nc2,ng2,naptype,1,nSubmode,b90, &
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nFadingModel,dat4,snr2,irc)
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enddo
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nc1z=nc1
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nc2z=nc2
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ng2z=ng2
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maxaptypez=maxaptype
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endif
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naptype=maxaptype
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call timer('sync_q65',0)
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call sync_q65(iwave,ntrperiod*12000,mode65,nsps,nfqso,ntol,xdt,f0,snr1)
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call timer('sync_q65',1)
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irc=-1
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if(snr1.ge.2.5) then
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jpk0=(xdt+1.0)*6000 !###
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if(ntrperiod.le.30) jpk0=(xdt+0.5)*6000 !###
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if(jpk0.lt.0) jpk0=0
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fac=1.0/32767.0
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dd=fac*iwave
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nmode=65
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call ana64(dd,npts,c00)
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call timer('qraloops',0)
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call qra_loops(c00,npts/2,nsps/2,nmode,mode65,nsubmode,nFadingModel, &
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ndepth,nc1,nc2,ng2,naptype,jpk0,xdt,f0,width,snr2,irc,dat4)
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call timer('qraloops',1)
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snr2=snr2 + db(6912.0/nsps)
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endif
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decoded=' '
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if(irc.ge.0) then
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call unpackmsg(dat4,decoded) !Unpack the user message
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call fmtmsg(decoded,iz)
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if(index(decoded,"000AAA ").ge.1) then
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! Suppress a certain type of garbage decode.
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decoded=' '
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irc=-1
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endif
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nsnr=nint(snr2)
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call this%callback(nutc,sync,nsnr,xdt,f0,decoded, &
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irc,qual,ntrperiod,fmid,w50)
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else
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nsnr=db(snr1) - 32.0
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!### TEMPORARY? ###
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call this%callback(nutc,sync,nsnr,xdt,f0,decoded, &
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irc,qual,ntrperiod,fmid,w50)
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!###
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endif
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! write(61,3061) nutc,irc,xdt,f0,snr1,snr2,trim(decoded)
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!3061 format(i6.6,i4,4f10.2,2x,a)
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return
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end subroutine decode
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end module q65_decode
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