2020-10-25 13:58:18 -04:00
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module q65_decode
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2020-08-01 09:24:59 -04:00
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2021-04-28 10:13:42 -04:00
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integer nsnr0,nfreq0
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real xdt0
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character msg0*37,cq0*3
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2021-01-12 11:28:46 -05:00
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type :: q65_decoder
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procedure(q65_decode_callback), pointer :: callback
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2020-08-01 09:24:59 -04:00
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contains
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2021-01-12 11:28:46 -05:00
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procedure :: decode
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end type q65_decoder
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2020-08-01 09:24:59 -04:00
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2021-01-12 11:28:46 -05:00
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abstract interface
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2021-01-13 10:55:01 -05:00
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subroutine q65_decode_callback (this,nutc,snr1,nsnr,dt,freq, &
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2021-01-19 15:30:17 -05:00
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decoded,idec,nused,ntrperiod)
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2021-01-12 11:28:46 -05:00
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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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2021-01-13 10:55:01 -05:00
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real, intent(in) :: snr1
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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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2021-01-14 13:23:09 -05:00
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integer, intent(in) :: idec
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2021-01-19 15:30:17 -05:00
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integer, intent(in) :: nused
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2021-01-12 11:28:46 -05:00
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integer, intent(in) :: ntrperiod
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end subroutine q65_decode_callback
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end interface
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2020-08-01 09:24:59 -04:00
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contains
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2021-01-23 10:58:28 -05:00
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subroutine decode(this,callback,iwave,nutc,ntrperiod,nsubmode,nfqso, &
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2021-02-02 09:58:04 -05:00
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ntol,ndepth,nfa0,nfb0,lclearave,single_decode,lagain,lnewdat0, &
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emedelay,mycall,hiscall,hisgrid,nQSOprogress,ncontest,lapcqonly,navg0)
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2020-08-01 09:24:59 -04:00
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2021-01-14 13:13:40 -05:00
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! Top-level routine that organizes the decoding of Q65 signals
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2020-10-09 13:16:25 -04:00
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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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2020-11-11 11:14:02 -05:00
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! ndepth Optional decoding level
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2021-01-14 13:13:40 -05:00
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! lclearave Flag to clear the message-averaging arrays
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! emedelay Sync search extended to cover EME delays
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! nQSOprogress Auto-sequencing state for the present QSO
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! ncontest Supported contest type
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! lapcqonly Flag to use AP only for CQ calls
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2020-10-09 13:16:25 -04:00
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! Output: sent to the callback routine for display to user
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2020-08-01 09:24:59 -04:00
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use timer_module, only: timer
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2020-10-27 13:08:07 -04:00
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use packjt77
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2020-08-01 09:24:59 -04:00
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use, intrinsic :: iso_c_binding
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2020-12-28 15:27:10 -05:00
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use q65 !Shared variables
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use prog_args
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2020-12-27 15:27:26 -05:00
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2020-10-09 13:16:25 -04:00
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parameter (NMAX=300*12000) !Max TRperiod is 300 s
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2020-10-25 13:58:18 -04:00
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class(q65_decoder), intent(inout) :: this
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procedure(q65_decode_callback) :: callback
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2020-10-09 13:16:25 -04:00
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character(len=12) :: mycall, hiscall !Used for AP decoding
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2020-08-01 09:24:59 -04:00
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character(len=6) :: hisgrid
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2020-10-09 13:16:25 -04:00
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character*37 decoded !Decoded message
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2020-10-27 13:08:07 -04:00
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character*77 c77
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2020-10-30 11:07:44 -04:00
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character*78 c78
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character*6 cutc
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character c6*6,c4*4,cmode*4
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character*80 fmt
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2020-08-08 09:14:12 -04:00
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integer*2 iwave(NMAX) !Raw data
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2020-10-17 13:16:46 -04:00
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real, allocatable :: dd(:) !Raw data
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2020-10-27 13:22:02 -04:00
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integer dat4(13) !Decoded message as 12 6-bit integers
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2020-11-22 13:58:29 -05:00
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integer dgen(13)
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2021-01-23 10:58:28 -05:00
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logical lclearave,lnewdat0,lapcqonly,unpk77_success
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2021-04-27 15:13:47 -04:00
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logical single_decode,lagain
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2020-10-09 13:16:25 -04:00
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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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2021-04-27 15:13:47 -04:00
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2021-01-14 13:13:40 -05:00
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! Start by setting some parameters and allocating storage for large arrays
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2021-01-28 13:01:52 -05:00
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call sec0(0,tdecode)
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2021-01-16 12:21:13 -05:00
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nfa=nfa0
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nfb=nfb0
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2021-01-23 10:58:28 -05:00
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lnewdat=lnewdat0
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2020-12-30 16:12:02 -05:00
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idec=-1
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2021-01-28 13:01:52 -05:00
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idf=0
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idt=0
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2021-02-08 09:24:16 -05:00
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nrc=-2
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2021-01-13 11:21:59 -05:00
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mode_q65=2**nsubmode
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2020-11-15 12:21:08 -05:00
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npts=ntrperiod*12000
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2020-08-08 09:14:12 -04:00
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nfft1=ntrperiod*12000
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nfft2=ntrperiod*6000
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2021-01-19 15:30:17 -05:00
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! Determine the T/R sequence: iseq=0 (even), or iseq=1 (odd)
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n=nutc
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2021-03-05 13:28:14 -05:00
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if(ntrperiod.ge.60 .and. nutc.le.2359) n=100*n
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2021-01-19 15:30:17 -05:00
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write(cutc,'(i6.6)') n
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read(cutc,'(3i2)') ih,im,is
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nsec=3600*ih + 60*im + is
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iseq=mod(nsec/ntrperiod,2)
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2021-01-14 14:56:37 -05:00
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if(lclearave) call q65_clravg
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2020-11-15 12:21:08 -05:00
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allocate(dd(npts))
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2020-10-08 16:48:11 -04:00
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allocate (c00(0:nfft1-1))
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2020-08-08 13:57:24 -04:00
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allocate (c0(0:nfft1-1))
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2020-08-09 11:04:49 -04:00
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2021-03-18 16:33:46 -04:00
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if(lagain) then
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call q65_hist(nfqso,dxcall=hiscall,dxgrid=hisgrid)
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endif
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2021-02-05 14:14:22 -05:00
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nsps=1800
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if(ntrperiod.eq.30) then
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2020-08-08 09:14:12 -04:00
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nsps=3600
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else if(ntrperiod.eq.60) then
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2020-10-25 14:10:38 -04:00
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nsps=7200
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2020-08-08 09:14:12 -04:00
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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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2020-10-09 14:12:34 -04:00
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endif
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2021-01-08 09:42:07 -05:00
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2020-10-09 14:12:34 -04:00
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baud=12000.0/nsps
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2020-10-29 10:53:30 -04:00
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this%callback => callback
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2020-10-09 14:12:34 -04:00
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nFadingModel=1
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2021-04-21 15:57:54 -04:00
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maxiters=33
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2021-02-02 09:27:40 -05:00
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ibwa=max(1,int(1.8*log(baud*mode_q65)) + 1)
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2021-04-21 15:57:54 -04:00
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ibwb=min(10,ibwa+2)
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2021-02-02 09:27:40 -05:00
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if(iand(ndepth,3).ge.2) then
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2021-02-06 09:43:14 -05:00
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ibwa=max(1,int(1.8*log(baud*mode_q65)) + 1)
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2021-02-02 09:27:40 -05:00
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ibwb=min(10,ibwa+5)
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2021-04-21 15:57:54 -04:00
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maxiters=67
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2021-02-02 09:27:40 -05:00
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else if(iand(ndepth,3).eq.3) then
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2021-01-08 09:42:07 -05:00
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ibwa=max(1,ibwa-1)
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ibwb=min(10,ibwb+1)
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2021-02-23 16:13:46 -05:00
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maxiters=100
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2021-01-08 09:42:07 -05:00
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endif
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2021-04-30 08:31:45 -04:00
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! Generate codewords for full-AP list decoding
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if(ichar(hiscall(1:1)).eq.0) hiscall=' '
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if(ichar(hisgrid(1:1)).eq.0) hisgrid=' '
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2021-01-06 10:48:21 -05:00
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call q65_set_list(mycall,hiscall,hisgrid,codewords,ncw)
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2020-11-30 09:52:47 -05:00
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dgen=0
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2020-12-28 15:27:10 -05:00
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call q65_enc(dgen,codewords) !Initialize the Q65 codec
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2021-01-14 14:56:37 -05:00
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nused=1
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2021-01-14 15:39:48 -05:00
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iavg=0
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2021-01-13 14:34:20 -05:00
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call timer('q65_dec0',0)
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2021-01-14 13:13:40 -05:00
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! Call top-level routine in q65 module: establish sync and try for a q3 decode.
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2021-01-14 15:39:48 -05:00
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call q65_dec0(iavg,nutc,iwave,ntrperiod,nfqso,ntol,ndepth,lclearave, &
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2021-01-14 13:13:40 -05:00
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emedelay,xdt,f0,snr1,width,dat4,snr2,idec)
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2021-01-13 14:34:20 -05:00
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call timer('q65_dec0',1)
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2021-01-14 13:13:40 -05:00
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2020-12-29 16:41:48 -05:00
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if(idec.ge.0) then
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2021-02-01 10:54:04 -05:00
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dtdec=xdt !We have a list-decode result at nfqso
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2021-01-19 14:11:21 -05:00
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f0dec=f0
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2020-12-29 16:41:48 -05:00
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go to 100
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2020-11-30 09:52:47 -05:00
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endif
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2021-01-08 09:42:07 -05:00
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2021-02-01 10:54:04 -05:00
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! Prepare for a single-period decode with iaptype = 0, 1, 2, or 4
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2020-12-28 15:27:10 -05:00
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jpk0=(xdt+1.0)*6000 !Index of nominal start of signal
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if(ntrperiod.le.30) jpk0=(xdt+0.5)*6000 !For shortest sequences
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2020-10-30 11:07:44 -04:00
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if(jpk0.lt.0) jpk0=0
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2021-02-01 13:28:59 -05:00
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call ana64(iwave,npts,c00) !Convert to complex c00() at 6000 Sa/s
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2021-01-14 14:56:37 -05:00
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call ft8apset(mycall,hiscall,ncontest,apsym0,aph10) ! Generate ap symbols
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2020-10-30 11:07:44 -04:00
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where(apsym0.eq.-1) apsym0=0
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npasses=2
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if(nQSOprogress.eq.5) npasses=3
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if(lapcqonly) npasses=1
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2020-11-11 15:06:24 -05:00
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iaptype=0
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2021-01-14 14:56:37 -05:00
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do ipass=0,npasses !Loop over AP passes
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2020-12-28 15:27:10 -05:00
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apmask=0 !Try first with no AP information
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2020-10-30 11:07:44 -04:00
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apsymbols=0
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if(ipass.ge.1) then
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2020-12-28 15:27:10 -05:00
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! Subsequent passes use AP information appropiate for nQSOprogress
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2020-11-11 15:06:24 -05:00
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call q65_ap(nQSOprogress,ipass,ncontest,lapcqonly,iaptype, &
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apsym0,apmask1,apsymbols1)
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2020-10-30 11:07:44 -04:00
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write(c78,1050) apmask1
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1050 format(78i1)
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read(c78,1060) apmask
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1060 format(13b6.6)
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write(c78,1050) apsymbols1
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read(c78,1060) apsymbols
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endif
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2020-12-28 15:27:10 -05:00
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2020-10-27 13:08:07 -04:00
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call timer('q65loops',0)
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2021-01-13 11:21:59 -05:00
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call q65_loops(c00,npts/2,nsps/2,nsubmode,ndepth,jpk0, &
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2020-12-30 15:05:02 -05:00
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xdt,f0,iaptype,xdt1,f1,snr2,dat4,idec)
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2020-10-27 13:08:07 -04:00
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call timer('q65loops',1)
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2021-01-19 14:11:21 -05:00
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if(idec.ge.0) then
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dtdec=xdt1
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f0dec=f1
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go to 100 !Successful decode, we're done
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endif
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2021-01-14 15:52:51 -05:00
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enddo ! ipass
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2020-10-30 11:07:44 -04:00
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2021-01-19 16:06:10 -05:00
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if(iand(ndepth,16).eq.0 .or. navg(iseq).lt.2) go to 100
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2021-03-16 11:39:59 -04:00
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2021-01-14 15:19:33 -05:00
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! There was no single-transmission decode. Try for an average 'q3n' decode.
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2021-03-16 11:39:59 -04:00
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50 call timer('list_avg',0)
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2021-01-14 15:52:51 -05:00
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! Call top-level routine in q65 module: establish sync and try for a q3
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! decode, this time using the cumulative 's1a' symbol spectra.
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2021-01-15 12:40:38 -05:00
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iavg=1
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call q65_dec0(iavg,nutc,iwave,ntrperiod,nfqso,ntol,ndepth,lclearave, &
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emedelay,xdt,f0,snr1,width,dat4,snr2,idec)
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call timer('list_avg',1)
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if(idec.ge.0) then
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2021-01-19 14:11:21 -05:00
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dtdec=xdt !We have a list-decode result from averaged data
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f0dec=f0
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2021-01-19 16:06:10 -05:00
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nused=navg(iseq)
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2021-01-15 12:40:38 -05:00
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go to 100
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endif
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2021-01-14 15:19:33 -05:00
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2021-02-01 10:54:04 -05:00
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! There was no 'q3n' decode. Try for a 'q[0124]n' decode.
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2021-01-15 12:40:38 -05:00
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! Call top-level routine in q65 module: establish sync and try for a q[012]n
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! decode, this time using the cumulative 's1a' symbol spectra.
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call timer('q65_avg ',0)
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iavg=2
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call q65_dec0(iavg,nutc,iwave,ntrperiod,nfqso,ntol,ndepth,lclearave, &
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emedelay,xdt,f0,snr1,width,dat4,snr2,idec)
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call timer('q65_avg ',1)
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2021-01-19 14:11:21 -05:00
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if(idec.ge.0) then
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dtdec=xdt !We have a q[012]n result
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f0dec=f0
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2021-01-19 16:06:10 -05:00
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nused=navg(iseq)
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2021-01-19 14:11:21 -05:00
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endif
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2021-01-15 12:40:38 -05:00
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2020-10-30 11:07:44 -04:00
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100 decoded=' '
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2021-01-14 13:13:40 -05:00
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if(idec.ge.0) then
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2020-12-30 10:42:27 -05:00
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! idec Meaning
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! ------------------------------------------------------
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! -1: No decode
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2021-01-14 14:56:37 -05:00
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! 0: Decode without AP information
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! 1: Decode with AP for "CQ ? ?"
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! 2: Decode with AP for "MyCall ? ?"
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! 3: Decode with AP for "MyCall DxCall ?"
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2020-12-30 10:42:27 -05:00
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2020-12-28 15:27:10 -05:00
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! Unpack decoded message for display to user
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2020-11-11 15:06:24 -05:00
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write(c77,1000) dat4(1:12),dat4(13)/2
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2020-10-27 13:08:07 -04:00
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1000 format(12b6.6,b5.5)
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call unpack77(c77,0,decoded,unpk77_success) !Unpack to get msgsent
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2021-02-25 12:45:07 -05:00
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call q65_snr(dat4,dtdec,f0dec,mode_q65,nused,snr2)
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2020-08-01 09:24:59 -04:00
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nsnr=nint(snr2)
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2021-01-19 15:30:17 -05:00
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call this%callback(nutc,snr1,nsnr,dtdec,f0dec,decoded, &
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idec,nused,ntrperiod)
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2021-03-18 16:33:46 -04:00
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call q65_hist(nint(f0dec),msg0=decoded)
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2021-03-12 14:27:58 -05:00
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if(iand(ndepth,128).ne.0 .and. .not.lagain .and. &
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int(abs(f0dec-nfqso)).le.ntol ) call q65_clravg !AutoClrAvg
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2021-01-28 13:01:52 -05:00
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call sec0(1,tdecode)
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open(22,file=trim(data_dir)//'/q65_decodes.dat',status='unknown', &
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position='append',iostat=ios)
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if(ios.eq.0) then
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! Save decoding parameters to q65_decoded.dat, for later analysis.
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2021-02-02 09:27:40 -05:00
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write(cmode,'(i3)') ntrperiod
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cmode(4:4)=char(ichar('A')+nsubmode)
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2021-01-28 13:01:52 -05:00
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c6=hiscall(1:6)
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if(c6.eq.' ') c6='<b> '
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c4=hisgrid(1:4)
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if(c4.eq.' ') c4='<b> '
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2021-03-12 14:44:47 -05:00
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fmt='(i6.4,1x,a4,4i2,6i3,i4,f6.2,f7.1,f6.1,f7.1,f6.2,'// &
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2021-02-02 09:27:40 -05:00
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'1x,a6,1x,a6,1x,a4,1x,a)'
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if(ntrperiod.le.30) fmt(5:5)='6'
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2021-02-08 09:24:16 -05:00
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if(idec.eq.3) nrc=0
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2021-02-25 12:45:07 -05:00
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write(22,fmt) nutc,cmode,nQSOprogress,idec,idfbest,idtbest,ibw, &
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2021-03-12 14:44:47 -05:00
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ndistbest,nused,icand,ncand,nrc,ndepth,xdt,f0,snr2,plog, &
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tdecode,mycall(1:6),c6,c4,trim(decoded)
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2021-01-28 13:01:52 -05:00
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close(22)
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endif
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2020-08-01 09:24:59 -04:00
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endif
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2021-01-19 16:06:10 -05:00
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navg0=1000*navg(0) + navg(1)
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2021-02-02 09:58:04 -05:00
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if(single_decode .or. lagain) go to 900
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2020-08-01 15:12:37 -04:00
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2021-02-01 13:28:59 -05:00
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do icand=1,ncand
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! Prepare for single-period candidate decodes with iaptype = 0, 1, 2, or 4
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snr1=candidates(icand,1)
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xdt= candidates(icand,2)
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f0 = candidates(icand,3)
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jpk0=(xdt+1.0)*6000 !Index of nominal start of signal
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if(ntrperiod.le.30) jpk0=(xdt+0.5)*6000 !For shortest sequences
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if(jpk0.lt.0) jpk0=0
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call ana64(iwave,npts,c00) !Convert to complex c00() at 6000 Sa/s
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call ft8apset(mycall,hiscall,ncontest,apsym0,aph10) ! Generate ap symbols
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where(apsym0.eq.-1) apsym0=0
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npasses=2
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if(nQSOprogress.eq.5) npasses=3
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if(lapcqonly) npasses=1
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iaptype=0
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do ipass=0,npasses !Loop over AP passes
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apmask=0 !Try first with no AP information
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apsymbols=0
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if(ipass.ge.1) then
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! Subsequent passes use AP information appropiate for nQSOprogress
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call q65_ap(nQSOprogress,ipass,ncontest,lapcqonly,iaptype, &
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apsym0,apmask1,apsymbols1)
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write(c78,1050) apmask1
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read(c78,1060) apmask
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write(c78,1050) apsymbols1
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read(c78,1060) apsymbols
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endif
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call timer('q65loops',0)
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call q65_loops(c00,npts/2,nsps/2,nsubmode,ndepth,jpk0, &
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xdt,f0,iaptype,xdt1,f1,snr2,dat4,idec)
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call timer('q65loops',1)
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if(idec.ge.0) then
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dtdec=xdt1
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f0dec=f1
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go to 200 !Successful decode, we're done
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endif
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enddo ! ipass
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200 decoded=' '
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if(idec.ge.0) then
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! Unpack decoded message for display to user
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write(c77,1000) dat4(1:12),dat4(13)/2
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call unpack77(c77,0,decoded,unpk77_success) !Unpack to get msgsent
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2021-02-25 12:45:07 -05:00
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call q65_snr(dat4,dtdec,f0dec,mode_q65,nused,snr2)
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2021-02-01 13:28:59 -05:00
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nsnr=nint(snr2)
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call this%callback(nutc,snr1,nsnr,dtdec,f0dec,decoded, &
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idec,nused,ntrperiod)
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2021-03-18 16:33:46 -04:00
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call q65_hist(nint(f0dec),msg0=decoded)
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2021-03-12 14:27:58 -05:00
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if(iand(ndepth,128).ne.0 .and. .not.lagain .and. &
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int(abs(f0dec-nfqso)).le.ntol ) call q65_clravg !AutoClrAvg
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2021-02-01 13:28:59 -05:00
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call sec0(1,tdecode)
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open(22,file=trim(data_dir)//'/q65_decodes.dat',status='unknown', &
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position='append',iostat=ios)
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if(ios.eq.0) then
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! Save decoding parameters to q65_decoded.dat, for later analysis.
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2021-02-02 09:27:40 -05:00
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write(cmode,'(i3)') ntrperiod
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cmode(4:4)=char(ichar('A')+nsubmode)
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2021-02-01 13:28:59 -05:00
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c6=hiscall(1:6)
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if(c6.eq.' ') c6='<b> '
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c4=hisgrid(1:4)
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if(c4.eq.' ') c4='<b> '
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2021-03-12 14:44:47 -05:00
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fmt='(i6.4,1x,a4,4i2,6i3,i4,f6.2,f7.1,f6.1,f7.1,f6.2,'// &
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2021-02-02 09:27:40 -05:00
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'1x,a6,1x,a6,1x,a4,1x,a)'
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if(ntrperiod.le.30) fmt(5:5)='6'
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2021-02-08 09:24:16 -05:00
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if(idec.eq.3) nrc=0
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2021-02-25 12:45:07 -05:00
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write(22,fmt) nutc,cmode,nQSOprogress,idec,idfbest,idtbest,ibw, &
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2021-03-12 14:44:47 -05:00
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ndistbest,nused,icand,ncand,nrc,ndepth,xdt,f0,snr2,plog, &
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tdecode,mycall(1:6),c6,c4,trim(decoded)
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2021-02-01 13:28:59 -05:00
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close(22)
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endif
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endif
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2021-03-16 11:39:59 -04:00
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enddo ! icand
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2021-04-02 09:56:50 -04:00
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if(iavg.eq.0 .and.navg(iseq).ge.2 .and. iand(ndepth,16).ne.0) go to 50
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2021-02-02 09:58:04 -05:00
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900 return
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2020-08-01 09:24:59 -04:00
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end subroutine decode
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2020-10-25 13:58:18 -04:00
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end module q65_decode
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