WSJT-X/map65/libm65/mapsim.f90

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4.3 KiB
Fortran
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program mapsim
! Generate simulated data for testing of MAP65
parameter (NMAX=96000*60)
real*4 d4(4,NMAX) !Floating-point data
integer*2 id4(4,NMAX) !i*2 data, dual polarization
integer*2 id2(2,NMAX) !i*2 data, single polarization
complex cwave(NMAX) !Generated complex waveform (no noise)
complex z,zx,zy
real*8 fcenter,fsample,samfac,f,dt,twopi,phi,dphi
character msg0*22,message*22,msgsent*22,arg*8,fname*13,mode*2
nargs=iargc()
if(nargs.ne.9) then
print*,'Usage: mapsim DT "message" mode f1 f2 nsigs pol SNR nfiles'
print*,'Example: 2.5 "CQ K1ABC FN42" B -22 33 20 45 -20 1'
print*,' '
print*,'Enter message = "" to use entries in msgs.txt.'
print*,'Enter pol = -1 to generate a range of polarization angles.'
print*,'Enter SNR = 0 to generate a range of SNRs.'
go to 999
endif
call getarg(1,arg)
read(arg,*) dt0 !Time delay
call getarg(2,msg0)
message=msg0 !Transmitted message
call getarg(3,mode) !JT65 sub-mode (A B C B2 C2)
call getarg(4,arg)
read(arg,*) f1 !Lowest freq (kHz, relative to fcenter)
call getarg(5,arg)
read(arg,*) f2 !Highest freq
call getarg(6,arg)
read(arg,*) nsigs !Number of signals in each file
call getarg(7,arg)
read(arg,*) npol !Polarization in degrees
call getarg(8,arg)
read(arg,*) snrdb !S/N
pol=npol
call getarg(9,arg)
read(arg,*) nfiles !Number of files
rmsdb=25.
rms=10.0**(0.05*rmsdb)
fcenter=144.125d0 !Center frequency (MHz)
fsample=96000.d0 !Sample rate (Hz)
dt=1.d0/fsample !Sample interval (s)
twopi=8.d0*atan(1.d0)
rad=360.0/twopi
samfac=1.d0
mode65=1
if(mode(1:1).eq.'B') mode65=2
if(mode(1:1).eq.'C') mode65=4
nfast=1
if(mode(2:2).eq.'2') nfast=2
npts=NMAX/nfast
open(12,file='msgs.txt',status='old')
write(*,1000)
1000 format('File N freq S/N pol Message'/ &
'---------------------------------------------------')
do ifile=1,nfiles
nmin=ifile-1
if(mode(2:2).eq.' ') nmin=2*nmin
write(fname,1002) nmin !Create the output filenames
1002 format('000000_',i4.4,'00')
open(10,file=fname//'.iq',access='stream',status='unknown')
open(11,file=fname//'.tf2',access='stream',status='unknown')
call noisegen(d4,npts) !Generate Gaussuian noise
if(msg0.ne.' ') then
call cgen65(message,mode65,nfast,samfac,nsendingsh,msgsent,cwave,nwave)
endif
rewind 12
do isig=1,nsigs
if(msg0.eq.' ') then
read(12,1004) message
1004 format(a22)
call cgen65(message,mode65,nfast,samfac,nsendingsh,msgsent, &
cwave,nwave)
endif
if(npol.lt.0) pol=(isig-1)*180.0/nsigs
a=cos(pol/rad)
b=sin(pol/rad)
f=1000.0*(f1+f2)/2.0
if(nsigs.gt.1) f=1000.0*(f1 + (isig-1)*(f2-f1)/(nsigs-1.0))
dphi=twopi*f*dt + 0.5*twopi
snrdbx=snrdb
if(snrdb.ge.-1.0) snrdbx=-15.0 - 15.0*(isig-1.0)/nsigs
sig=sqrt(2.2*2500.0/96000.0) * 10.0**(0.05*snrdbx)
write(*,1020) ifile,isig,0.001*f,snrdbx,nint(pol),msgsent
1020 format(i3,i4,f8.3,f7.1,i5,2x,a22)
phi=0.
! i0=fsample*(3.5d0+0.05d0*(isig-1))
i0=fsample*(1.d0 + dt0)
do i=1,nwave
phi=phi + dphi
if(phi.lt.-twopi) phi=phi+twopi
if(phi.gt.twopi) phi=phi-twopi
xphi=phi
z=sig*cwave(i)*cmplx(cos(xphi),-sin(xphi))
zx=a*z
zy=b*z
j=i+i0
d4(1,j)=d4(1,j) + real(zx)
d4(2,j)=d4(2,j) + aimag(zx)
d4(3,j)=d4(3,j) + real(zy)
d4(4,j)=d4(4,j) + aimag(zy)
enddo
enddo
do i=1,npts
id4(1,i)=nint(rms*d4(1,i))
id4(2,i)=nint(rms*d4(2,i))
id4(3,i)=nint(rms*d4(3,i))
id4(4,i)=nint(rms*d4(4,i))
id2(1,i)=id4(1,i)
id2(2,i)=id4(2,i)
enddo
write(10) fcenter,id2(1:2,1:npts)
write(11) fcenter,id4(1:4,1:npts)
close(10)
close(11)
enddo
999 end program mapsim