WSJT-X/map65/libm65/mapsim.f90

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7.8 KiB
Fortran
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program mapsim
! Generate simulated data for testing of MAP65
parameter (NMAX=60*96000)
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
logical bq65
character msg0*22,message*22,msgsent*22,arg*8,fname*11,mode*2
character*16 msg_list(60)
data msg_list/ &
'W1AAA K2BBB EM00','W2CCC K3DDD EM01','W3EEE K4FFF EM02', &
'W5GGG K6HHH EM03','W7III K8JJJ EM04','W9KKK K0LLL EM05', &
'G0MMM F1NNN JN06','G2OOO F3PPP JN07','G4QQQ F5RRR JN08', &
'G6SSS F7TTT JN09','W1XAA K2XBB EM10','W2XCC K3XDD EM11', &
'W3XEE K4XFF EM12','W5XGG K6XHH EM13','W7XII K8XJJ EM14', &
'W9XKK K0XLL EM15','G0XMM F1XNN JN16','G2XOO F3XPP JN17', &
'G4XQQ F5XRR JN18','G6XSS F7XTT JN19','W1YAA K2YBB EM20', &
'W2YCC K3YDD EM21','W3YEE K4YFF EM22','W5YGG K6YHH EM23', &
'W7YII K8YJJ EM24','W9YKK K0YLL EM25','G0YMM F1YNN JN26', &
'G2YOO F3YPP JN27','G4YQQ F5YRR JN28','G6YSS F7YTT JN29', &
'W1ZAA K2ZBB EM30','W2ZCC K3ZDD EM31','W3ZEE K4ZFF EM32', &
'W5ZGG K6ZHH EM33','W7ZII K8ZJJ EM34','W9ZKK K0ZLL EM35', &
'G0ZMM F1ZNN JN36','G2ZOO F3ZPP JN37','G4ZQQ F5ZRR JN38', &
'G6ZSS F7ZTT JN39','W1AXA K2BXB EM40','W2CXC K3DXD EM41', &
'W3EXE K4FXF EM42','W5GXG K6HXH EM43','W7IXI K8JXJ EM44', &
'W9KXK K0LXL EM45','G0MXM F1NXN JN46','G2OXO F3PXP JN47', &
'G4QXQ F5RXR JN48','G6SXS F7TXT JN49','W1AYA K2BYB EM50', &
'W2CYC K3DYD EM51','W3EYE K4FYF EM52','W5GYG K6HYH EM53', &
'W7IYI K8JYJ EM54','W9KYK K0LYL EM55','G0MYM F1NYN JN56', &
'G2OYO F3PYP JN57','G4QYQ F5RYR JN58','G6SYS F7TYT JN59'/
nargs=iargc()
if(nargs.ne.10) then
print*,'Usage: mapsim "message" mode DT fa fb nsigs pol fDop SNR nfiles'
print*,'Example: mapsim "CQ K1ABC FN42" B 2.5 -20 20 21 45 0.0 -20 1'
print*,' '
print*,' mode = A B C for JT65; QA-QE for Q65-60A'
print*,' fa = lowest freq in kHz, relative to center'
print*,' fb = highest freq in kHz, relative to center'
print*,' message = "list" to use callsigns from list'
print*,' pol = -1 to generate a range of polarization angles.'
print*,' SNR = 0 to generate a range of SNRs.'
go to 999
endif
call getarg(1,msg0)
call getarg(2,mode) !JT65 sub-mode (A B C QA-QE)
call getarg(3,arg)
read(arg,*) dt0 !Time delay
call getarg(4,arg)
read(arg,*) fa !Lowest freq (kHz, relative to fcenter)
call getarg(5,arg)
read(arg,*) fb !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
pol=npol
call getarg(8,arg)
read(arg,*) fdop !Doppler spread
call getarg(9,arg)
read(arg,*) snrdb !S/N
call getarg(10,arg)
read(arg,*) nfiles !Number of files
message=msg0 !Transmitted message
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
bq65=(mode(1:1).eq.'Q')
ntone_spacing=1
ntxfreq=1270
fac=1.0/32767.0
if(mode(1:1).eq.'B' .or. mode(2:2).eq.'B') ntone_spacing=2
if(mode(1:1).eq.'C' .or. mode(2:2).eq.'C') ntone_spacing=4
if(mode(2:2).eq.'D') ntone_spacing=8
if(mode(2:2).eq.'E') ntone_spacing=16
npts=NMAX
write(*,1000)
1000 format('File N Mode DT freq pol fDop SNR Message'/68('-'))
do ifile=1,nfiles
ilist=0
nmin=ifile-1
if(mode(2:2).eq.' ') nmin=2*nmin
write(fname,1002) nmin !Create the output filenames
1002 format('000000_',i4.4)
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(1:4).ne.'list') then
if(bq65) then
call gen_q65_cwave(message,ntxfreq,ntone_spacing,msgsent, &
cwave,nwave)
else
call cgen65(message,ntone_spacing,samfac,nsendingsh,msgsent, &
cwave,nwave)
endif
endif
if(fdop.gt.0.0) call dopspread(cwave,fdop)
do isig=1,nsigs
if(msg0(1:4).eq.'list') then
ilist=ilist+1
message=msg_list(ilist)
if(bq65) then
call gen_q65_cwave(message,ntxfreq,ntone_spacing,msgsent, &
cwave,nwave)
else
call cgen65(message,ntone_spacing,samfac,nsendingsh,msgsent, &
cwave,nwave)
endif
endif
if(npol.lt.0) pol=(isig-1)*180.0/nsigs
a=cos(pol/rad)
b=sin(pol/rad)
f=1000.0*(fa+fb)/2.0
if(nsigs.gt.1) f=1000.0*(fa + (isig-1)*(fb-fa)/(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,mode,dt0,0.001*f,nint(pol),fDop,snrdbx,msgsent
1020 format(i3,i3,2x,a2,f6.2,f8.3,i5,2f7.1,2x,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
subroutine dopspread(cwave,fspread)
parameter (NMAX=60*96000)
parameter (NFFT=NMAX,NH=NFFT/2)
complex cwave(NMAX)
complex cspread(0:NMAX-1)
twopi=8.0*atan(1.0)
df=96000.0/nfft
cspread(0)=1.0
cspread(NH)=0.
b=6.0 !Use truncated Lorenzian shape for fspread
do i=1,NH
f=i*df
x=b*f/fspread
z=0.
a=0.
if(x.lt.3.0) then !Cutoff beyond x=3
a=sqrt(1.111/(1.0+x*x)-0.1) !Lorentzian amplitude
phi1=twopi*rran() !Random phase
z=a*cmplx(cos(phi1),sin(phi1))
endif
cspread(i)=z
z=0.
if(x.lt.3.0) then !Same thing for negative freqs
phi2=twopi*rran()
z=a*cmplx(cos(phi2),sin(phi2))
endif
cspread(nfft-i)=z
enddo
call four2a(cspread,nfft,1,1,1) !Transform to time domain
sum=0.
do i=0,nfft-1
p=real(cspread(i))**2 + aimag(cspread(i))**2
sum=sum+p
enddo
avep=sum/nfft
fac=sqrt(1.0/avep)
cspread=fac*cspread !Normalize to constant avg power
cwave=cspread*cwave !Apply Rayleigh fading
! do i=0,nfft-1
! p=real(cspread(i))**2 + aimag(cspread(i))**2
! write(14,3010) i,p,cspread(i)
!3010 format(i8,3f12.6)
! enddo
return
end subroutine dopspread