module q65_decode type :: q65_decoder procedure(q65_decode_callback), pointer :: callback contains procedure :: decode end type q65_decoder abstract interface subroutine q65_decode_callback (this,nutc,sync,nsnr,dt,freq, & decoded,nap,qual,ntrperiod,fmid,w50) import q65_decoder implicit none class(q65_decoder), intent(inout) :: this integer, intent(in) :: nutc real, intent(in) :: sync integer, intent(in) :: nsnr real, intent(in) :: dt real, intent(in) :: freq character(len=37), intent(in) :: decoded integer, intent(in) :: nap real, intent(in) :: qual integer, intent(in) :: ntrperiod real, intent(in) :: fmid real, intent(in) :: w50 end subroutine q65_decode_callback end interface contains subroutine decode(this,callback,iwave,nutc,ntrperiod,nsubmode,nfqso, & ntol,ndepth,mycall,hiscall,hisgrid) ! Decodes Q65 signals ! Input: iwave Raw data, i*2 ! nutc UTC for time-tagging the decode ! ntrperiod T/R sequence length (s) ! nsubmode Tone-spacing indicator, 0-4 for A-E ! nfqso Target signal frequency (Hz) ! ntol Search range around nfqso (Hz) ! ndepth Optional decoding level (???) ! Output: sent to the callback routine for display to user use timer_module, only: timer use packjt77 use, intrinsic :: iso_c_binding parameter (NMAX=300*12000) !Max TRperiod is 300 s class(q65_decoder), intent(inout) :: this procedure(q65_decode_callback) :: callback character(len=12) :: mycall, hiscall !Used for AP decoding character(len=6) :: hisgrid character*37 decoded !Decoded message character*77 c77 integer*2 iwave(NMAX) !Raw data real, allocatable :: dd(:) !Raw data integer dat4(13) !Decoded message as 12 6-bit integers logical unpk77_success complex, allocatable :: c00(:) !Analytic signal, 6000 Sa/s complex, allocatable :: c0(:) !Analytic signal, 6000 Sa/s data nc1z/-1/,nc2z/-1/,ng2z/-1/,maxaptypez/-1/,nsubmodez/-1/ save nc1z,nc2z,ng2z,maxaptypez,nsubmodez mode65=2**nsubmode nfft1=ntrperiod*12000 nfft2=ntrperiod*6000 allocate(dd(NMAX)) allocate (c00(0:nfft1-1)) allocate (c0(0:nfft1-1)) if(ntrperiod.eq.15) then nsps=1800 else if(ntrperiod.eq.30) then nsps=3600 else if(ntrperiod.eq.60) then nsps=7200 else if(ntrperiod.eq.120) then nsps=16000 else if(ntrperiod.eq.300) then nsps=41472 else stop 'Invalid TR period' endif npts=ntrperiod*12000 baud=12000.0/nsps df1=12000.0/nfft1 this%callback => callback if(nutc.eq.-999) print*,lapdx,nfa,nfb,nfqso !Silence warning b90=20.0 !8 to 25 is OK; not very critical nFadingModel=1 ! AP control could be done differently, but this works well: maxaptype=0 ! if(ndepth.eq.2) maxaptype=3 ! if(ndepth.eq.3) maxaptype=5 if(ndepth.ge.2) maxaptype=5 !### minsync=-2 call qra_params(ndepth,maxaptype,idfmax,idtmax,ibwmin,ibwmax,maxdist) naptype=maxaptype call timer('sync_q65',0) call sync_q65(iwave,ntrperiod*12000,mode65,nsps,nfqso,ntol,xdt,f0,snr1) call timer('sync_q65',1) irc=-1 if(snr1.ge.2.5) then jpk0=(xdt+1.0)*6000 !### if(ntrperiod.le.30) jpk0=(xdt+0.5)*6000 !### if(jpk0.lt.0) jpk0=0 fac=1.0/32767.0 dd=fac*iwave nmode=65 call ana64(dd,npts,c00) call timer('q65loops',0) call q65_loops(c00,npts/2,nsps/2,nmode,mode65,nsubmode,nFadingModel, & ndepth,jpk0,xdt,f0,width,snr2,irc,dat4) call timer('q65loops',1) snr2=snr2 + db(6912.0/nsps) endif decoded=' ' if(irc.ge.0) then irc=(irc/100) * 100 !### TEMPORARY ??? ### write(c77,1000) dat4 1000 format(12b6.6,b5.5) call unpack77(c77,0,decoded,unpk77_success) !Unpack to get msgsent nsnr=nint(snr2) call this%callback(nutc,sync,nsnr,xdt,f0,decoded, & irc,qual,ntrperiod,fmid,w50) else nsnr=db(snr1) - 35.0 !### TEMPORARY? ### call this%callback(nutc,sync,nsnr,xdt,f0,decoded, & irc,qual,ntrperiod,fmid,w50) !### endif ! write(61,3061) nutc,irc,xdt,f0,snr1,snr2,trim(decoded) !3061 format(i6.6,i4,4f10.2,2x,a) return end subroutine decode end module q65_decode