mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-18 10:01:57 -05:00
51 lines
1.3 KiB
Fortran
51 lines
1.3 KiB
Fortran
subroutine spec_qra65(c0,nsps,s3,LL,NN)
|
|
|
|
! Compute synchronized symbol spectra.
|
|
|
|
complex c0(0:85*nsps-1) !Synchronized complex data at 6000 S/s
|
|
complex, allocatable :: cs(:) !Complex symbol spectrum
|
|
real s3(LL,NN) !Synchronized symbol spectra
|
|
real xbase0(LL),xbase(LL) !Work arrays
|
|
integer isync(22) !Indices of sync symbols
|
|
data isync/1,9,12,13,15,22,23,26,27,33,35,38,46,50,55,60,62,66,69,74,76,85/
|
|
|
|
allocate(cs(0:nsps-1))
|
|
fac=1.0/nsps
|
|
j=0
|
|
n=1
|
|
do k=1,84
|
|
if(k.eq.isync(n)) then
|
|
n=n+1
|
|
cycle
|
|
endif
|
|
j=j+1
|
|
ja=(k-1)*nsps
|
|
jb=ja+nsps-1
|
|
cs=fac*c0(ja:jb)
|
|
call four2a(cs,nsps,1,-1,1) !c2c FFT to frequency
|
|
do ii=1,LL
|
|
i=ii-65
|
|
if(i.lt.0) i=i+nsps
|
|
s3(ii,j)=real(cs(i))**2 + aimag(cs(i))**2
|
|
enddo
|
|
enddo
|
|
|
|
df=6000.0/nsps
|
|
do i=1,LL
|
|
call pctile(s3(i,1:NN),NN,45,xbase0(i)) !Get baseline for passband shape
|
|
enddo
|
|
|
|
nh=9
|
|
xbase(1:nh-1)=sum(xbase0(1:nh-1))/(nh-1.0)
|
|
xbase(LL-nh+1:LL)=sum(xbase0(LL-nh+1:LL))/(nh-1.0)
|
|
do i=nh,LL-nh
|
|
xbase(i)=sum(xbase0(i-nh+1:i+nh))/(2*nh+1) !Smoothed passband shape
|
|
enddo
|
|
|
|
do i=1,LL
|
|
s3(i,1:NN)=s3(i,1:NN)/(xbase(i)+0.001) !Apply frequency equalization
|
|
enddo
|
|
|
|
return
|
|
end subroutine spec_qra65
|