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https://github.com/saitohirga/WSJT-X.git
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75 lines
2.8 KiB
Fortran
75 lines
2.8 KiB
Fortran
subroutine qmapa(dd,ss,savg,newdat,nutc,fcenter,ntol,nfa,nfb, &
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mousedf,mousefqso,nagain,nfshift,max_drift,nfcal,mycall, &
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hiscall,hisgrid,nfsample,nmode,ndepth,datetime,ndop00,fselected)
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! Processes timf2 data received from Linrad to find and decode Q65 signals.
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use timer_module, only: timer
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type candidate
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real :: snr !Relative S/N of sync detection
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real :: f !Freq of sync tone, 0 to 96000 Hz
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real :: xdt !DT of matching sync pattern, -1.0 to +4.0 s
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end type candidate
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parameter (NFFT=32768) !Size of FFTs done in symspec()
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parameter (MAX_CANDIDATES=50)
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parameter (MAXMSG=1000) !Size of decoded message list
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parameter (NSMAX=60*96000)
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complex cx(NSMAX/64) !Data at 1378.125 samples/s
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real dd(2,NSMAX) !I/Q data from Linrad
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real ss(322,NFFT) !Symbol spectra
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real savg(NFFT) !Average spectrum
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real*8 fcenter !Center RF frequency, MHz
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character mycall*12,hiscall*12,hisgrid*6
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type(candidate) :: cand(MAX_CANDIDATES)
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character*60 result
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character*20 datetime
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common/decodes/ndecodes,ncand,nQDecoderDone,nWDecoderBusy, &
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nWTransmitting,result(50)
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save
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tsec0=sec_midn()
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if(nagain.eq.1) ndepth=3 !Use full depth for click-to-decode
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nkhz_center=nint(1000.0*(fcenter-int(fcenter)))
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mfa=nfa-nkhz_center+48
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mfb=nfb-nkhz_center+48
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mode_q65=nmode/10
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nts_q65=2**(mode_q65-1) !Q65 tone separation factor
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f0_selected=fselected - nkhz_center + 48.0
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call timer('get_cand',0)
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! Get a list of decoding candidates
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call getcand2(ss,savg,nts_q65,nagain,ntol,f0_selected,cand,ncand)
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call timer('get_cand',1)
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nwrite_q65=0
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df=96000.0/NFFT !df = 96000/NFFT = 2.930 Hz
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if(nfsample.eq.95238) df=95238.1/NFFT
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ftol=0.010 !Frequency tolerance (kHz)
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foffset=0.001*(1270 + nfcal) !Offset from sync tone, plus CAL
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fqso=mousefqso + foffset - 0.5*(nfa+nfb) + nfshift !fqso at baseband (khz)
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nqd=0
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nagain2=0
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call timer('filbig ',0)
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call filbig(dd,NSMAX,f0,newdat,nfsample,cx,n5) !Do the full-length FFT
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call timer('filbig ',1)
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do icand=1,ncand !Attempt to decode each candidate
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f0=cand(icand)%f
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freq=cand(icand)%f+nkhz_center-48.0-1.27046
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ikhz=nint(freq)
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idec=-1
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call timer('q65b ',0)
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call q65b(nutc,nqd,fcenter,nfcal,nfsample,ikhz,mousedf,ntol, &
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mycall,hiscall,hisgrid,mode_q65,f0,fqso,nkhz_center,newdat, &
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nagain2,max_drift,ndepth,datetime,ndop00,idec)
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call timer('q65b ',1)
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tsec=sec_midn() - tsec0
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if(tsec.gt.30.0) exit !Don't start another decode attempt after t=30 s.
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enddo ! icand
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return
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end subroutine qmapa
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