mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-09-08 14:26:38 -04:00
4b1c3c319f
git-svn-id: svn+ssh://svn.code.sf.net/p/wsjt/wsjt/branches/wsjtx@5559 ab8295b8-cf94-4d9e-aec4-7959e3be5d79
118 lines
2.8 KiB
Fortran
118 lines
2.8 KiB
Fortran
subroutine avecho(id2,ndop,nfrit,nqual,f1,rms0,sigdb,snr,dfreq,width)
|
|
|
|
integer TXLENGTH
|
|
parameter (TXLENGTH=27648) !27*1024
|
|
parameter (NFFT=32768,NH=NFFT/2)
|
|
integer*2 id2(34560) !Buffer for Rx data
|
|
real sa(2000) !Avg spectrum relative to initial Doppler echo freq
|
|
real sb(2000) !Avg spectrum with Dither and changing Doppler removed
|
|
integer nsum !Number of integrations
|
|
real dop0 !Doppler shift for initial integration (Hz)
|
|
real doppler !Doppler shift for current integration (Hz)
|
|
real s(8192)
|
|
real x(NFFT)
|
|
integer ipkv(1)
|
|
complex c(0:NH)
|
|
equivalence (x,c),(ipk,ipkv)
|
|
common/echocom/nclearave,nsum,blue(2000),red(2000)
|
|
save dop0,sa,sb
|
|
|
|
dop=ndop
|
|
sq=0.
|
|
do i=1,TXLENGTH
|
|
x(i)=id2(i)
|
|
sq=sq + x(i)*x(i)
|
|
enddo
|
|
rms0=sqrt(sq/TXLENGTH)
|
|
|
|
if(nclearave.ne.0) nsum=0
|
|
if(nsum.eq.0) then
|
|
dop0=dop !Remember the initial Doppler
|
|
sa=0. !Clear the average arrays
|
|
sb=0.
|
|
endif
|
|
|
|
x(TXLENGTH+1:)=0.
|
|
x=x/TXLENGTH
|
|
call four2a(x,NFFT,1,-1,0)
|
|
df=12000.0/NFFT
|
|
do i=1,8192 !Get spectrum 0 - 3 kHz
|
|
s(i)=real(c(i))**2 + aimag(c(i))**2
|
|
enddo
|
|
|
|
fnominal=1500.0 !Nominal audio frequency w/o doppler or dither
|
|
ia=nint((fnominal+dop0-nfrit)/df)
|
|
ib=nint((f1+dop-nfrit)/df)
|
|
if(ia.lt.600 .or. ib.lt.600) go to 900
|
|
if(ia.gt.7590 .or. ib.gt.7590) go to 900
|
|
|
|
nsum=nsum+1
|
|
|
|
do i=1,2000
|
|
sa(i)=sa(i) + s(ia+i-1000) !Center at initial doppler freq
|
|
sb(i)=sb(i) + s(ib+i-1000) !Center at expected echo freq
|
|
enddo
|
|
|
|
call pctile(sb,200,50,r0)
|
|
call pctile(sb(1800),200,50,r1)
|
|
|
|
sum=0.
|
|
sq=0.
|
|
do i=1,2000
|
|
y=r0 + (r1-r0)*(i-100.0)/1800.0
|
|
blue(i)=sa(i)/y
|
|
red(i)=sb(i)/y
|
|
if(i.le.500 .or. i.ge.1501) then
|
|
sum=sum+red(i)
|
|
sq=sq + (red(i)-1.0)**2
|
|
endif
|
|
enddo
|
|
ave=sum/1000.0
|
|
rms=sqrt(sq/1000.0)
|
|
|
|
redmax=maxval(red)
|
|
ipkv=maxloc(red)
|
|
fac=10.0/max(redmax,10.0)
|
|
dfreq=(ipk-1000)*df
|
|
snr=(redmax-ave)/rms
|
|
|
|
sigdb=-99.0
|
|
if(ave.gt.0.0) sigdb=10.0*log10(redmax/ave - 1.0) - 35.7
|
|
|
|
nqual=0
|
|
if(nsum.ge.2 .and. nsum.lt.4) nqual=(snr-4)/5
|
|
if(nsum.ge.4 .and. nsum.lt.8) nqual=(snr-3)/4
|
|
if(nsum.ge.8 .and. nsum.lt.12) nqual=(snr-3)/3
|
|
if(nsum.ge.12) nqual=(snr-2.5)/2.5
|
|
if(nqual.lt.0) nqual=0
|
|
if(nqual.gt.10) nqual=10
|
|
|
|
! Scale for plotting
|
|
blue=fac*blue
|
|
red=fac*red
|
|
|
|
sum=0.
|
|
do i=ipk,ipk+300
|
|
if(red(i).lt.1.0) exit
|
|
sum=sum+(red(i)-1.0)
|
|
enddo
|
|
do i=ipk-1,ipk-300,-1
|
|
if(red(i).lt.1.0) exit
|
|
sum=sum+(red(i)-1.0)
|
|
enddo
|
|
bins=sum/(red(ipk)-1.0)
|
|
width=df*bins
|
|
nsmo=max(0.0,0.25*bins)
|
|
|
|
do i=1,nsmo
|
|
call smo121(red,2000)
|
|
call smo121(blue,2000)
|
|
enddo
|
|
|
|
900 continue
|
|
write(*,3001) ia*df,ib*df,dop,r0,r1,nfrit,nclearave,nsum
|
|
3001 format(5f10.1,3i6)
|
|
|
|
return
|
|
end subroutine avecho
|