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Implement message averaging (very basic) for QRA66.

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This commit is contained in:
Joe Taylor 2020-08-05 16:34:49 -04:00
parent 6c8c9183aa
commit 30e34bf1c4
1 changed files with 20 additions and 2 deletions
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22
lib/qra66_decode.f90
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@ -45,9 +45,10 @@ contains
logical lapdx,ltext
complex c0(0:NFFT1-1) !Analytic signal, 6000 S/s
real s3(-64:127,63)
real s3a(-64:127,63)
real a(5)
data nc1z/-1/,nc2z/-1/,ng2z/-1/,maxaptypez/-1/
save nc1z,nc2z,ng2z,maxaptypez
save nc1z,nc2z,ng2z,maxaptypez,nsave,s3a
this%callback => callback
nsps=1800
@ -80,6 +81,8 @@ contains
nc2z=nc2
ng2z=ng2
maxaptypez=maxaptype
s3a=0.
nsave=0
endif
naptype=maxaptype
@ -115,16 +118,31 @@ contains
if(xx.gt.s3max) s3(-64:127,j)=s3(-64:127,j)*s3max/xx
enddo
!Call Nico's QRA64 decoder
! Call Nico's QRA64 decoder
call timer('qra64_de',0)
call qra64_dec(s3,nc1,nc2,ng2,naptype,0,nSubmode,b90, &
nFadingModel,dat4,snr2,irc)
call timer('qra64_de',1)
if(irc.lt.0) then
! No luck so far. Try for an average decode.
call timer('qra64_av',0)
s3a=s3a+s3
nsave=nsave+1
if(nsave.ge.2) then
call qra64_dec(s3a,nc1,nc2,ng2,naptype,0,nSubmode,b90, &
nFadingModel,dat4,snr2,irc)
if(irc.ge.0) irc=10*nsave + irc
endif
call timer('qra64_av',1)
endif
snr2=snr2 + 5.563 !10*log(6912/1920)
if(irc.gt.0) call badmsg(irc,dat4,nc1,nc2,ng2)
decoded=' '
if(irc.ge.0) then
nsave=0
s3a=0.
call unpackmsg(dat4,decoded) !Unpack the user message
call fmtmsg(decoded,iz)
if(index(decoded,"000AAA ").ge.1) then