WSJT-X/lib/qratest.f90

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Fortran
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program qratest
parameter (NMAX=60*12000)
real dd(NMAX)
real t(5)
integer*8 count0,count1,clkfreq
character*8 arg
nargs=iargc()
if(nargs.ne.3) then
print*,'Usage: qratest f0 maxf1 fTol'
go to 999
endif
call getarg(1,arg)
read(arg,*) nf0
call getarg(2,arg)
read(arg,*) maxf1
call getarg(3,arg)
read(arg,*) ntol
nf1=nf0-ntol
nf2=nf0+ntol
! do iskip=1,13
! read(60)
! enddo
do n=1,999
read(60,end=999) dd
call system_clock(count0,clkfreq)
call sync64(dd,nf1,nf2,maxf1,dtx,f0,kpk,snr,t)
call system_clock(count1,clkfreq)
tsec=float(count1-count0)/float(clkfreq)
! nf0=200*nint(f0/200.)
dfreq0=f0-nf0
write(*,1000) dtx,f0,dfreq0,kpk,snr,tsec
1000 format(f8.3,f8.2,f7.2,i4,f8.1,f7.3)
enddo
999 end program qratest
subroutine sync64(dd,nf1,nf2,maxf1,dtx,f0,kpk,snr,t)
parameter (NMAX=60*12000) !Max size of raw data at 12000 Hz
parameter (NSPS=2304) !Samples per symbol at 4000 Hz
parameter (NSPC=7*NSPS) !Samples per Costas array
real dd(NMAX) !Raw data
real x(672000) !Up to 56 s at 12000 Hz
real t(5)
real s0(0:NSPC-1)
real s1(0:NSPC-1)
real s2(0:NSPC-1)
real s3(0:NSPC-1)
real s0a(0:NSPC-1)
integer*8 count0,count1,clkfreq
integer icos7(0:6)
integer ipk0(1)
complex cc(0:NSPC-1)
complex c0(0:336000)
complex c1(0:NSPC-1)
complex c2(0:NSPC-1)
complex c3(0:NSPC-1)
equivalence (x,c0)
data icos7/2,5,6,0,4,1,3/ !Costas 7x7 pattern
twopi=8.0*atan(1.0)
dfgen=12000.0/6912.0
k=-1
phi=0.
do j=0,6
dphi=twopi*icos7(j)*dfgen/4000.0
do i=1,2304
phi=phi + dphi
if(phi.gt.twopi) phi=phi-twopi
k=k+1
cc(k)=cmplx(cos(phi),sin(phi))
enddo
enddo
npts0=54*12000
nfft1=672000
nfft2=nfft1/3
df1=12000.0/nfft1
fac=2.0/nfft1
x=fac*dd(1:nfft1)
call system_clock(count0,clkfreq)
call four2a(c0,nfft1,1,-1,0) !Forward r2c FFT
call four2a(c0,nfft2,1,1,1) !Inverse c2c FFT; c0 is analytic sig
call system_clock(count1,clkfreq)
t(1)=float(count1-count0)/float(clkfreq)
npts2=npts0/3 !Downsampled complex data length
nfft3=NSPC
nh3=nfft3/2
df3=4000.0/nfft3
ia=nint(nf1/df3)
ib=nint(nf2/df3)
iz=ib-ia+1
snr=0.
jpk=0
ja=0
jb=6*4000
jstep=200
ka=-maxf1
kb=maxf1
ipk=0
kpk=0
call system_clock(count0,clkfreq)
do iter=1,2
do j1=ja,jb,jstep
j2=j1 + 39*2304
j3=j1 + 77*2304
c1=1.e-4*c0(j1:j1+NSPC-1) * conjg(cc)
call four2a(c1,nfft3,1,-1,1)
c2=1.e-4*c0(j2:j2+NSPC-1) * conjg(cc)
call four2a(c2,nfft3,1,-1,1)
c3=1.e-4*c0(j3:j3+NSPC-1) * conjg(cc)
call four2a(c3,nfft3,1,-1,1)
s0=0.
s1=0.
s2=0.
s3=0.
do i=ia,ib
freq=i*df3
s1(i)=real(c1(i))**2 + aimag(c1(i))**2
s2(i)=real(c2(i))**2 + aimag(c2(i))**2
s3(i)=real(c3(i))**2 + aimag(c3(i))**2
enddo
do k=ka,kb
s0(ia:ib)=s1(ia-k:ib-k) + s2(ia:ib) + s3(ia+k:ib+k)
call smo121(s0(ia:ib),iz)
call averms(s0(ia:ib),iz,14,ave,rms)
s=(maxval(s0(ia:ib))-ave)/rms
if(s.gt.snr) then
jpk=j1
s0a=s0
snr=s
dtx=jpk/4000.0 - 1.0
ipk0=maxloc(s0(ia:ib))
ipk=ipk0(1)
f0=(ipk+ia-1)*df3
kpk=k
write(16,3101) jpk,ipk,kpk,dtx,f0,snr
3101 format(3i5,f8.3,f8.2,f10.1)
endif
enddo
enddo
ja=jpk-2*jstep
jb=jpk+2*jstep
jstep=10
! ka=kpk
! kb=kpk
enddo
call system_clock(count1,clkfreq)
t(2)=float(count1-count0)/float(clkfreq)
return
end subroutine sync64
subroutine averms(x,n,nskip,ave,rms)
real x(n)
integer ipk(1)
ns=0
s=0.
sq=0.
ipk=maxloc(x)
do i=1,n
if(abs(i-ipk(1)).gt.nskip) then
s=s + x(i)
sq=sq + x(i)**2
ns=ns+1
endif
enddo
ave=s/ns
rms=sqrt(sq/ns - ave*ave)
return
end subroutine averms