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Reject candiates with fewer than 7 correct hard-decoded sync symbols.

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git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@7946 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
This commit is contained in:
Steven Franke 2017-07-25 20:55:13 +00:00
parent dc5305573d
commit 7b8a86dca7
1 changed files with 20 additions and 0 deletions
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20
lib/fsk4hf/ft8b.f90
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@ -16,10 +16,12 @@ subroutine ft8b(dd0,newdat,nfqso,ndepth,lapon,napwid,lsubtract,iaptype,icand, &
integer*1 msgbits(KK)
integer apsym(KK),rr73(11),cq(28)
integer itone(NN)
integer icos7(0:6),ip(1)
complex cd0(3200)
complex ctwk(32)
complex csymb(32)
logical newdat,lsubtract,lapon
data icos7/2,5,6,0,4,1,3/
data rr73/-1,1,1,1,1,1,1,-1,1,1,-1/
data cq/1,1,1,1,1,-1,1,-1,-1,-1,-1,-1,1,-1,-1,-1,-1,-1,1,1,-1,-1,-1,1,1,-1,-1,1/
@ -79,6 +81,24 @@ subroutine ft8b(dd0,newdat,nfqso,ndepth,lapon,napwid,lsubtract,iaptype,icand, &
call four2a(csymb,32,1,-1,1)
s2(0:7,k)=abs(csymb(1:8))
enddo
! sync quality check
is1=0
is2=0
is3=0
do k=1,7
ip=maxloc(s2(:,k))
if(icos7(k-1).eq.(ip(1)-1)) is1=is1+1
ip=maxloc(s2(:,k+36))
if(icos7(k-1).eq.(ip(1)-1)) is2=is2+1
ip=maxloc(s2(:,k+72))
if(icos7(k-1).eq.(ip(1)-1)) is3=is3+1
enddo
! hard sync sum - max is 21
nsync=is1+is2+is3
if(nsync .le. 6) then ! bail out
nbadcrc=1
return
endif
j=0
do k=1,NN
if(k.le.7) cycle