2020-10-07 16:04:00 -04:00
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subroutine qra_loops(c00,npts2,mode,mode64,nsubmode,nFadingModel,minsync, &
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2020-10-08 16:48:11 -04:00
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ndepth,nc1,nc2,ng2,naptype,jpk0,xdt,f0,width,snr2,s3,irc,dat4)
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2020-10-07 16:04:00 -04:00
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use timer_module, only: timer
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parameter (LN=1152*63)
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complex c00(0:720000) !Analytic representation of dd(), 6000 Hz
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complex c0(0:720000) !Ditto, with freq shift
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real a(3) !twkfreq params f,f1,f2
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real s3(LN),s3a(LN) !Symbol spectra
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integer dat4(12),dat4x(12) !Decoded message (as 12 integers)
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integer nap(0:11) !AP return codes
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data nap/0,2,3,2,3,4,2,3,6,4,6,6/
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irc=-99
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s3lim=20.
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ibwmax=11
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if(mode64.le.4) ibwmax=9
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ibwmin=0
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idtmax=5
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if(minsync.eq.-2) then
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ibwmin=ibwmax
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idtmax=3
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endif
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LL=64*(mode64+2)
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NN=63
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napmin=99
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ncall=0
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2020-10-08 16:48:11 -04:00
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nsps=3456 !QRA64
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if(mode.eq.65) nsps=3840 !QRA65
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2020-10-07 16:04:00 -04:00
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do idf0=1,11
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idf=idf0/2
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if(mod(idf0,2).eq.0) idf=-idf
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a=0.
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a(1)=-(f0+0.868*idf)
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call twkfreq(c00,c0,npts2,6000.0,a)
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do idt0=1,idtmax
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idt=idt0/2
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if(mod(idt0,2).eq.0) idt=-idt
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2020-10-08 16:48:11 -04:00
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jpk=jpk0 + 750*idt
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if(jpk.lt.0) jpk=0
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call spec64(c0,nsps,mode,jpk,s3a,LL,NN)
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2020-10-07 16:04:00 -04:00
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call pctile(s3a,LL*NN,40,base)
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s3a=s3a/base
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where(s3a(1:LL*NN)>s3lim) s3a(1:LL*NN)=s3lim
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do ibw=ibwmax,ibwmin,-2
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b90=1.728**ibw
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if(b90.gt.230.0) cycle
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if(b90.lt.0.15*width) exit
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s3(1:LL*NN)=s3a(1:LL*NN)
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ncall=ncall+1
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call timer('qra64_de',0)
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call qra64_dec(s3,nc1,nc2,ng2,naptype,0,nSubmode,b90, &
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nFadingModel,dat4,snr2,irc)
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call timer('qra64_de',1)
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if(irc.eq.0) go to 200
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if(irc.gt.0) call badmsg(irc,dat4,nc1,nc2,ng2)
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iirc=max(0,min(irc,11))
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if(irc.gt.0 .and. nap(iirc).lt.napmin) then
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dat4x=dat4
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b90x=b90
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snr2x=snr2
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napmin=nap(iirc)
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irckeep=irc
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2020-10-08 16:48:11 -04:00
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xdtkeep=jpk/6000.0 - 1.0
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2020-10-07 16:04:00 -04:00
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f0keep=-a(1)
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idfkeep=idf
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idtkeep=idt
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ibwkeep=ibw
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endif
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enddo ! ibw (b90 loop)
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if(iand(ndepth,3).lt.3 .and. irc.ge.0) go to 100
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if(irc.eq.0) go to 100
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enddo ! idt (DT loop)
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enddo ! idf (f0 loop)
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100 if(napmin.ne.99) then
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dat4=dat4x
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b90=b90x
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snr2=snr2x
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irc=irckeep
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2020-10-08 16:48:11 -04:00
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xdt=xdtkeep
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2020-10-07 16:04:00 -04:00
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f0=f0keep
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idt=idtkeep
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idf=idfkeep
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ibw=ibwkeep
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endif
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200 return
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end subroutine qra_loops
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