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