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Allow optional frequency drift of simulated Q65 signals.

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This commit is contained in:
Joe Taylor 2021-01-02 13:09:47 -05:00
parent e5a8e80c49
commit bc58604d42
1 changed files with 14 additions and 10 deletions
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24
lib/qra/q65/q65sim.f90
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@ -15,13 +15,14 @@ program q65sim
complex cspread(0:NMAX-1) !Complex amplitude for Rayleigh fading
complex z
real*8 f0,dt,twopi,phi,dphi,baud,fsample,freq
character msg*37,fname*17,csubmode*1,arg*12,cd*1
character msg*37,fname*17,csubmode*1,arg*12
character msgsent*37
nargs=iargc()
if(nargs.ne.8) then
print *, 'Usage: q65sim "msg" A-E freq fDop DT TRp Nfiles SNR'
print *, 'Example: q65sim "K1ABC W9XYZ EN37" A 1500 0.0 0.0 60 1 -26'
if(nargs.ne.9) then
print*,'Usage: q65sim "msg" A-E freq fDop DT f1 TRp Nfile SNR'
print*,'Example: q65sim "K1ABC W9XYZ EN37" A 1500 0.0 0.0 0.0 60 1 -26'
print*,' fDop is Doppler spread; f1 is drift rate (Hz/min)'
go to 999
endif
call getarg(1,msg)
@ -34,10 +35,12 @@ program q65sim
call getarg(5,arg)
read(arg,*) xdt
call getarg(6,arg)
read(arg,*) ntrperiod
read(arg,*) f1
call getarg(7,arg)
read(arg,*) nfiles
read(arg,*) ntrperiod
call getarg(8,arg)
read(arg,*) nfiles
call getarg(9,arg)
read(arg,*) snrdb
if(ntrperiod.eq.15) then
@ -86,7 +89,7 @@ program q65sim
h=default_header(12000,npts)
write(*,1004)
1004 format('File TR Freq Mode S/N DT Dop Message'/60('-'))
1004 format('File TR Freq Mode S/N Dop DT f1 Message'/66('-'))
do ifile=1,nfiles !Loop over requested number of files
if(ntrperiod.lt.60) then
@ -109,8 +112,8 @@ program q65sim
bandwidth_ratio=2500.0/6000.0
sig=sqrt(2*bandwidth_ratio)*10.0**(0.05*snrdb)
if(snrdb.gt.90.0) sig=1.0
write(*,1020) ifile,ntrperiod,f0,csubmode,snrdb,xdt,fspread,trim(msgsent)
1020 format(i4,i6,f7.1,2x,a1,2x,f5.1,f6.2,f6.1,2x,a)
write(*,1020) ifile,ntrperiod,f0,csubmode,snrdb,fspread,xdt,f1,trim(msgsent)
1020 format(i4,i6,f7.1,2x,a1,2x,f5.1,f6.2,2f6.1,2x,a)
phi=0.d0
dphi=0.d0
k=(xdt+0.5)*12000 !Start audio at t=xdt+0.5 s (TR=15 and 30 s)
@ -120,7 +123,8 @@ program q65sim
isym=i/nsps + 1
if(isym.gt.nsym) exit
if(isym.ne.isym0) then
freq=f0 + itone(isym)*baud*mode65
! Drift term
freq = f0 + itone(isym)*baud*mode65 + f1*i*dt/60.0
dphi=twopi*freq*dt
isym0=isym
endif