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Simplify ft4sim by removing waveform generation code and replacing it with a call to gen_ft4wave.f90.

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This commit is contained in:
Steve Franke 2019-10-24 10:36:50 -05:00
parent ca07d22e89
commit 63e9c21a17
2 changed files with 13 additions and 39 deletions
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50
lib/ft4/ft4sim.f90
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@ -5,20 +5,18 @@ program ft4sim
use wavhdr
use packjt77
include 'ft4_params.f90' !Set various constants
parameter (NWAVE=NN*NSPS)
parameter (NZZ=21*3456) !72576
type(hdr) h !Header for .wav file
character arg*12,fname*17
character msg37*37,msgsent37*37
character c77*77
complex c0(0:NZZ-1)
complex c(0:NZZ-1)
real wave(NZZ)
real dphi(0:NZZ-1)
complex c0(0:NMAX-1)
complex c(0:NMAX-1)
real wave(NMAX)
real dphi(0:NMAX-1)
real pulse(3*NSPS)
integer itone(NN)
integer*1 msgbits(77)
integer*2 iwave(NZZ) !Generated full-length waveform
integer*2 iwave(NMAX) !Generated full-length waveform
integer icos4(4)
data icos4/0,1,3,2/
@ -82,49 +80,25 @@ program ft4sim
call sgran()
! The filtered frequency pulse
do i=1,3*NSPS
tt=(i-1.5*NSPS)/real(NSPS)
pulse(i)=gfsk_pulse(1.0,tt)
enddo
! Define the instantaneous frequency waveform
dphi_peak=twopi*hmod/real(NSPS)
dphi=0.0
do j=1,NN
ib=(j-1)*NSPS
ie=ib+3*NSPS-1
dphi(ib:ie)=dphi(ib:ie)+dphi_peak*pulse*itone(j)
enddo
phi=0.0
c0=0.0
dphi=dphi+twopi*f0*dt
! do j=0,NMAX-1 !### ??? ###
do j=0,(NN+2)*NSPS-1
c0(j)=cmplx(cos(phi),sin(phi))
phi=mod(phi+dphi(j),twopi)
enddo
c0(0:NSPS-1)=c0(0:NSPS-1)*(1.0-cos(twopi*(/(i,i=0,NSPS-1)/)/(2.0*NSPS)) )/2.0
c0((NN+1)*NSPS:(NN+2)*NSPS-1)=c0((NN+1)*NSPS:(NN+2)*NSPS-1)*(1.0+cos(twopi*(/(i,i=0,NSPS-1)/)/(2.0*NSPS) ))/2.0
c0((NN+2)*NSPS:)=0.
fsample=12000.0
icmplx=1
call gen_ft4wave(itone,NN,NSPS,fsample,f0,c0,wave,icmplx,NMAX)
k=nint((xdt+0.5)/dt)-NSPS
c0=cshift(c0,-k)
if(k.gt.0) c0(0:k-1)=0.0
if(k.lt.0) c0(NZZ+k:NZZ-1)=0.0
if(k.lt.0) c0(NMAX+k:NMAX-1)=0.0
do ifile=1,nfiles
c=c0
if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c,NZZ,NWAVE,fs,delay,fspread)
if(fspread.ne.0.0 .or. delay.ne.0.0) call watterson(c,NMAX,NZ,fs,delay,fspread)
c=sig*c
wave=real(c)
peak=maxval(abs(wave))
nslots=1
if(snrdb.lt.90) then
do i=1,NZZ !Add gaussian noise at specified SNR
do i=1,NMAX !Add gaussian noise at specified SNR
xnoise=gran()
wave(i)=wave(i) + xnoise
enddo
@ -140,7 +114,7 @@ program ft4sim
endif
if(any(abs(wave).gt.32767.0)) print*,"Warning - data will be clipped."
iwave=nint(wave)
h=default_header(12000,NZZ)
h=default_header(12000,NMAX)
write(fname,1102) ifile
1102 format('000000_',i6.6,'.wav')
open(10,file=fname,status='unknown',access='stream')

2
lib/ft4/gen_ft4wave.f90
View File

@ -37,7 +37,7 @@ subroutine gen_ft4wave(itone,nsym,nsps,fsample,f0,cwave,wave,icmplx,nwave)
wave=0.
if(icmplx.eq.1) cwave=0.
k=0
do j=0,nwave-1
do j=0,(nsym+2)*nsps-1
k=k+1
if(icmplx.eq.0) then
wave(k)=sin(phi)