mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-09-27 15:46:51 -04:00
More work on FT2. New frame format is 16sync + 128codeword. Data chunk is assumed to be 2.5s long. A rudimentary sync routine is implemented which finds the single strongest signal.
This commit is contained in:
Steve Franke
parent
f63f0301eb
commit
cf1fe6c3d6
@ -546,6 +546,7 @@ set (wsjt_FSRCS
|
||||
lib/sync4.f90
|
||||
lib/sync64.f90
|
||||
lib/sync65.f90
|
||||
lib/fsk4hf/getcandidates2.f90
|
||||
lib/ft8/sync8.f90
|
||||
lib/ft8/sync8d.f90
|
||||
lib/sync9.f90
|
||||
|
||||
@ -5,8 +5,8 @@ parameter (NS=16) !Sync symbols (2x8)
|
||||
parameter (NN=NS+ND) !Total channel symbols (144)
|
||||
parameter (NSPS=160) !Samples per symbol at 12000 S/s
|
||||
parameter (NZ=NSPS*NN) !Samples in full 1.92 s waveform (23040)
|
||||
parameter (NMAX=3*12000) !Samples in iwave (36,000)
|
||||
parameter (NFFT1=2*NSPS, NH1=NFFT1/2) !Length of FFTs for symbol spectra
|
||||
parameter (NMAX=2.5*12000) !Samples in iwave (36,000)
|
||||
parameter (NFFT1=400, NH1=NFFT1/2) !Length of FFTs for symbol spectra
|
||||
parameter (NSTEP=NSPS/4) !Rough time-sync step size
|
||||
parameter (NHSYM=NMAX/NSTEP-3) !Number of symbol spectra (1/4-sym steps)
|
||||
parameter (NDOWN=10) !Downsample factor
|
||||
parameter (NDOWN=16) !Downsample factor
|
||||
|
||||
@ -7,23 +7,28 @@ program ft2d
|
||||
character*37 decodes(100)
|
||||
character*120 data_dir
|
||||
character*90 dmsg
|
||||
complex c2(0:3*1200-1) !Complex waveform
|
||||
complex c2(0:NMAX/16-1) !Complex waveform
|
||||
complex cb(0:NMAX/16-1)
|
||||
complex cd(0:144*10-1) !Complex waveform
|
||||
complex c1(0:9),c0(0:9)
|
||||
complex ccor(0:1,144)
|
||||
complex csum,cterm,cc0,cc1
|
||||
complex csum,cterm,cc0,cc1,csync1,csync2
|
||||
real*8 fMHz
|
||||
|
||||
real a(5)
|
||||
real rxdata(128),llr(128) !Soft symbols
|
||||
real llr2(128)
|
||||
real sbits(144),sbits1(144),sbits3(144)
|
||||
real ps(0:8191),psbest(0:8191)
|
||||
real candidates(100,2)
|
||||
real savg(NH1),sbase(NH1)
|
||||
integer ihdr(11)
|
||||
integer*2 iwave(NMAX) !Generated full-length waveform
|
||||
integer*1 message77(77),apmask(128),cw(128)
|
||||
integer*1 hbits(144),hbits1(144),hbits3(144)
|
||||
integer*1 s16(16)
|
||||
logical unpk77_success
|
||||
data s16/0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0/
|
||||
|
||||
fs=12000.0/NDOWN !Sample rate
|
||||
dt=1/fs !Sample interval after downsample (s)
|
||||
@ -81,7 +86,8 @@ program ft2d
|
||||
fr2=0.0
|
||||
nav=0
|
||||
ngood=0
|
||||
|
||||
fsum=0.0
|
||||
fsum2=0.0
|
||||
do ifile=iarg,nargs
|
||||
call getarg(ifile,infile)
|
||||
j2=index(infile,'.wav')
|
||||
@ -91,16 +97,55 @@ program ft2d
|
||||
datetime=infile(j2-11:j2-1)
|
||||
close(10)
|
||||
|
||||
call getcandidates2(iwave,100.0,3000.0,0.2,2200.0,100,savg,candidates,ncand,sbase)
|
||||
|
||||
ndecodes=0
|
||||
ncand=1
|
||||
do icand=1,ncand
|
||||
fc0=1500.0
|
||||
f0=candidates(icand,1)
|
||||
xsnr=1.0
|
||||
istart=6000+8
|
||||
call ft2_downsample(iwave,c2) ! downsample from 160s/Symbol to 10s/Symbol
|
||||
|
||||
ib=istart/16
|
||||
cd=c2(ib:ib+144*10-1)
|
||||
call ft2_downsample(iwave,f0,c2) ! downsample from 160s/Symbol to 10s/Symbol
|
||||
ibest=-1
|
||||
sybest=-99.
|
||||
dfbest=-1.
|
||||
do if=-15,+15
|
||||
df=if
|
||||
a=0.
|
||||
a(1)=-df
|
||||
call twkfreq1(c2,NMAX/16,fs,a,cb)
|
||||
! 750 samples/second here
|
||||
do is=0,374
|
||||
csync1=0.
|
||||
cterm=1
|
||||
do ib=1,16
|
||||
i1=(ib-1)*10+is
|
||||
i2=i1+136*10
|
||||
if(s16(ib).eq.1) then
|
||||
csync1=csync1+sum(cb(i1:i1+9)*conjg(c1(0:9)))*cterm
|
||||
cterm=cterm*cc1
|
||||
else
|
||||
csync1=csync1+sum(cb(i1:i1+9)*conjg(c0(0:9)))*cterm
|
||||
cterm=cterm*cc0
|
||||
endif
|
||||
enddo
|
||||
if(abs(csync1).gt.sybest) then
|
||||
ibest=is
|
||||
sybest=abs(csync1)
|
||||
dfbest=df
|
||||
endif
|
||||
enddo
|
||||
enddo
|
||||
freq=f0+dfbest
|
||||
fsum=fsum+freq
|
||||
fsum2=fsum+freq*freq
|
||||
a=0.
|
||||
a(1)=-dfbest
|
||||
!write(*,*) 'dfbest ',dfbest
|
||||
!dfbest=0.0
|
||||
!ibest=187
|
||||
call twkfreq1(c2,NMAX/16,fs,a,cb)
|
||||
ib=ibest
|
||||
cd=cb(ib:ib+144*10-1)
|
||||
s2=sum(cd*conjg(cd))/(10*144)
|
||||
cd=cd/sqrt(s2)
|
||||
do nseq=1,4
|
||||
@ -153,8 +198,7 @@ program ft2d
|
||||
sbits=sbits3
|
||||
hbits=hbits3
|
||||
endif
|
||||
rxdata(1:48)=sbits(9:56)
|
||||
rxdata(49:128)=sbits(65:144)
|
||||
rxdata=sbits(17:144)
|
||||
rxav=sum(rxdata(1:128))/128.0
|
||||
rx2av=sum(rxdata(1:128)*rxdata(1:128))/128.0
|
||||
rxsig=sqrt(rx2av-rxav*rxav)
|
||||
@ -175,6 +219,7 @@ program ft2d
|
||||
if( nharderror.ge.0 ) then
|
||||
write(c77,'(77i1)') message77(1:77)
|
||||
call unpack77(c77,message,unpk77_success)
|
||||
idupe=0
|
||||
do i=1,ndecodes
|
||||
if(decodes(i).eq.message) idupe=1
|
||||
enddo
|
||||
@ -182,10 +227,9 @@ program ft2d
|
||||
ndecodes=ndecodes+1
|
||||
decodes(ndecodes)=message
|
||||
nsnr=nint(xsnr)
|
||||
freq=fMHz + 1.d-6*(fc1+fbest)
|
||||
1210 format(a11,2i4,f6.2,f12.7,2x,a22,i3)
|
||||
write(*,1212) datetime(8:11),nsnr,xdt,freq,message,'*',idf,nseq,ijitter,nharderror,nhardmin
|
||||
1212 format(a4,i4,f5.1,f11.6,2x,a22,a1,i5,i5,i5,i5,i5)
|
||||
write(*,1212) datetime(8:11),nsnr,ibest/750.0,freq,message,'*',idf,nseq,ijitter,nharderror,nhardmin
|
||||
1212 format(a4,i4,f5.1,f11.1,2x,a22,a1,i5,i5,i5,i5,i5)
|
||||
goto 888
|
||||
endif
|
||||
enddo ! nseq
|
||||
@ -195,7 +239,9 @@ program ft2d
|
||||
|
||||
write(*,1120)
|
||||
1120 format("<DecodeFinished>")
|
||||
|
||||
favg=fsum/1000.0
|
||||
fstd=sqrt(fsum2/1000.0-favg*favg)
|
||||
write(*,*) "Mean, std frequency: ",favg,fstd
|
||||
999 end program ft2d
|
||||
|
||||
subroutine getbitmetric(ib,ps,ns,xmet)
|
||||
@ -234,66 +280,7 @@ subroutine downsample2(ci,f0,co)
|
||||
return
|
||||
end subroutine downsample2
|
||||
|
||||
subroutine getcandidate2(c,npts,fs,fa,fb,ncand,candidates)
|
||||
parameter(NDAT=200,NFFT1=120*12000/32,NH1=NFFT1/2,NFFT2=120*12000/320,NH2=NFFT2/2)
|
||||
complex c(0:npts-1) !Complex waveform
|
||||
complex cc(0:NFFT1-1)
|
||||
complex csfil(0:NFFT2-1)
|
||||
complex cwork(0:NFFT2-1)
|
||||
real bigspec(0:NFFT2-1)
|
||||
complex c2(0:NFFT1-1) !Short spectra
|
||||
real s(-NH1+1:NH1) !Coarse spectrum
|
||||
real ss(-NH1+1:NH1) !Smoothed coarse spectrum
|
||||
real candidates(100,2)
|
||||
integer indx(NFFT2-1)
|
||||
logical first
|
||||
data first/.true./
|
||||
save first,w,df,csfil
|
||||
|
||||
if(first) then
|
||||
df=10*fs/NFFT1
|
||||
csfil=cmplx(0.0,0.0)
|
||||
do i=0,NFFT2-1
|
||||
csfil(i)=exp(-((i-NH2)/20.0)**2)
|
||||
enddo
|
||||
csfil=cshift(csfil,NH2)
|
||||
call four2a(csfil,NFFT2,1,-1,1)
|
||||
first=.false.
|
||||
endif
|
||||
|
||||
cc=cmplx(0.0,0.0)
|
||||
cc(0:npts-1)=c;
|
||||
call four2a(cc,NFFT1,1,-1,1)
|
||||
cc=abs(cc)**2
|
||||
call four2a(cc,NFFT1,1,-1,1)
|
||||
cwork(0:NH2)=cc(0:NH2)*conjg(csfil(0:NH2))
|
||||
cwork(NH2+1:NFFT2-1)=cc(NFFT1-NH2+1:NFFT1-1)*conjg(csfil(NH2+1:NFFT2-1))
|
||||
|
||||
call four2a(cwork,NFFT2,1,+1,1)
|
||||
bigspec=cshift(real(cwork),-NH2)
|
||||
il=NH2+fa/df
|
||||
ih=NH2+fb/df
|
||||
nnl=ih-il+1
|
||||
call indexx(bigspec(il:il+nnl-1),nnl,indx)
|
||||
xn=bigspec(il-1+indx(nint(0.3*nnl)))
|
||||
bigspec=bigspec/xn
|
||||
ncand=0
|
||||
do i=il,ih
|
||||
if((bigspec(i).gt.bigspec(i-1)).and. &
|
||||
(bigspec(i).gt.bigspec(i+1)).and. &
|
||||
(bigspec(i).gt.1.15).and.ncand.lt.100) then
|
||||
ncand=ncand+1
|
||||
candidates(ncand,1)=df*(i-NH2)
|
||||
candidates(ncand,2)=10*log10(bigspec(i))-30.0
|
||||
endif
|
||||
enddo
|
||||
! do i=1,ncand
|
||||
! write(*,*) i,candidates(i,1),candidates(i,2)
|
||||
! enddo
|
||||
return
|
||||
end subroutine getcandidate2
|
||||
|
||||
subroutine ft2_downsample(iwave,c)
|
||||
subroutine ft2_downsample(iwave,f0,c)
|
||||
|
||||
! Input: i*2 data in iwave() at sample rate 12000 Hz
|
||||
! Output: Complex data in c(), sampled at 1200 Hz
|
||||
@ -310,7 +297,7 @@ subroutine ft2_downsample(iwave,c)
|
||||
df=12000.0/NMAX
|
||||
x=iwave
|
||||
call four2a(x,NMAX,1,-1,0) !r2c FFT to freq domain
|
||||
i0=nint(1500.0/df)
|
||||
i0=nint(f0/df)
|
||||
c1(0)=cx(i0)
|
||||
do i=1,NFFT2/2
|
||||
c1(i)=cx(i0+i)
|
||||
|
||||
@ -89,7 +89,7 @@ program ft2sim
|
||||
call sgran()
|
||||
|
||||
do ifile=1,nfiles
|
||||
k=nint((xdt+0.5)/dt)
|
||||
k=nint((xdt+0.25)/dt)
|
||||
ia=k
|
||||
phi=0.0
|
||||
c0=0.0
|
||||
|
||||
@ -9,13 +9,8 @@ subroutine genft2(msg0,ichk,msgsent,i4tone,itype)
|
||||
! - msgsent message as it will be decoded
|
||||
! - i4tone array of audio tone values, 0 or 1
|
||||
! - itype message type
|
||||
! 1 = standard message "Call_1 Call_2 Grid/Rpt"
|
||||
! 2 = type 1 prefix
|
||||
! 3 = type 1 suffix
|
||||
! 4 = type 2 prefix
|
||||
! 5 = type 2 suffix
|
||||
! 6 = free text (up to 13 characters)
|
||||
! 7 = short message "<Call_1 Call2> Rpt"
|
||||
! 1 = 77 bit message
|
||||
! 7 = 16 bit message "<Call_1 Call2> Rpt"
|
||||
|
||||
use iso_c_binding, only: c_loc,c_size_t
|
||||
use packjt77
|
||||
@ -27,24 +22,15 @@ subroutine genft2(msg0,ichk,msgsent,i4tone,itype)
|
||||
integer*1 codeword(128)
|
||||
integer*1 msgbits(77)
|
||||
integer*1 bitseq(144) !Tone #s, data and sync (values 0-1)
|
||||
integer*1 s8(8)
|
||||
real*8 pp(12)
|
||||
integer*1 s16(16)
|
||||
real*8 xi(864),xq(864),pi,twopi
|
||||
data s8/0,1,1,1,0,0,1,0/
|
||||
data s16/0,0,0,0,1,1,1,1,1,1,1,1,0,0,0,0/
|
||||
equivalence (ihash,i1hash)
|
||||
logical first,unpk77_success
|
||||
data first/.true./
|
||||
save
|
||||
logical unpk77_success
|
||||
|
||||
if(first) then
|
||||
first=.false.
|
||||
nsym=128
|
||||
pi=4.0*atan(1.0)
|
||||
twopi=8.*atan(1.0)
|
||||
do i=1,12
|
||||
pp(i)=sin((i-1)*pi/12)
|
||||
enddo
|
||||
endif
|
||||
nsym=128
|
||||
pi=4.0*atan(1.0)
|
||||
twopi=8.*atan(1.0)
|
||||
|
||||
message(1:37)=' '
|
||||
itype=1
|
||||
@ -89,36 +75,12 @@ subroutine genft2(msg0,ichk,msgsent,i4tone,itype)
|
||||
call encode_128_90(msgbits,codeword)
|
||||
|
||||
!Create 144-bit channel vector:
|
||||
!8-bit sync word + 48 bits + 8-bit sync word + 80 bits
|
||||
bitseq=0
|
||||
bitseq(1:8)=s8
|
||||
bitseq(9:56)=codeword(1:48)
|
||||
bitseq(57:64)=s8
|
||||
bitseq(65:144)=codeword(49:128)
|
||||
bitseq(1:16)=s16
|
||||
bitseq(17:144)=codeword
|
||||
|
||||
i4tone=bitseq
|
||||
|
||||
! bitseq=2*bitseq-1
|
||||
! xq(1:6)=bitseq(1)*pp(7:12) !first bit is mapped to 1st half-symbol on q
|
||||
! do i=1,71
|
||||
! is=(i-1)*12+7
|
||||
! xq(is:is+11)=bitseq(2*i+1)*pp
|
||||
! enddo
|
||||
! xq(864-5:864)=bitseq(1)*pp(1:6) !last half symbol
|
||||
! do i=1,72
|
||||
! is=(i-1)*12+1
|
||||
! xi(is:is+11)=bitseq(2*i)*pp
|
||||
! enddo
|
||||
! Map I and Q to tones.
|
||||
! i4tone=0
|
||||
! do i=1,72
|
||||
! i4tone(2*i-1)=(bitseq(2*i)*bitseq(2*i-1)+1)/2;
|
||||
! i4tone(2*i)=-(bitseq(2*i)*bitseq(mod(2*i,144)+1)-1)/2;
|
||||
! enddo
|
||||
endif
|
||||
|
||||
! Flip polarity
|
||||
! i4tone=-i4tone+1
|
||||
|
||||
999 return
|
||||
end subroutine genft2
|
||||
|
||||
51
lib/fsk4hf/getcandidates2.f90
Normal file
51
lib/fsk4hf/getcandidates2.f90
Normal file
@ -0,0 +1,51 @@
|
||||
subroutine getcandidates2(id,nfa,nfb,syncmin,nfqso,maxcand,savg,candidate, &
|
||||
ncand,sbase)
|
||||
|
||||
! For now, hardwired to find the largest peak in the average spectrum
|
||||
|
||||
include 'ft2_params.f90'
|
||||
real s(NH1,NHSYM)
|
||||
real savg(NH1),savsm(NH1)
|
||||
real sbase(NH1)
|
||||
real x(NFFT1)
|
||||
complex cx(0:NH1)
|
||||
real candidate(3,maxcand)
|
||||
integer*2 id(NMAX)
|
||||
integer*1 s8(8)
|
||||
data s8/0,1,1,1,0,0,1,0/
|
||||
equivalence (x,cx)
|
||||
|
||||
! Compute symbol spectra, stepping by NSTEP steps.
|
||||
savg=0.
|
||||
tstep=NSTEP/12000.0
|
||||
df=12000.0/NFFT1 !3.125 Hz
|
||||
fac=1.0/300.0
|
||||
do j=1,NHSYM
|
||||
ia=(j-1)*NSTEP + 1
|
||||
ib=ia+NSPS-1
|
||||
x(1:NSPS)=fac*id(ia:ib)
|
||||
x(NSPS+1:)=0.
|
||||
call four2a(x,NFFT1,1,-1,0) !r2c FFT
|
||||
do i=1,NH1
|
||||
s(i,j)=real(cx(i))**2 + aimag(cx(i))**2
|
||||
enddo
|
||||
savg=savg + s(1:NH1,j) !Average spectrum
|
||||
enddo
|
||||
savsm=0.
|
||||
do i=2,NH1-1
|
||||
savsm(i)=sum(savg(i-1:i+1))/3.
|
||||
enddo
|
||||
|
||||
imax=-1
|
||||
xmax=-99.
|
||||
do i=2,NH1-1
|
||||
if(savsm(i).gt.savsm(i-1).and.savsm(i).gt.savsm(i+1).and.savsm(i).gt.xmax) then
|
||||
xmax=savsm(i)
|
||||
imax=i
|
||||
endif
|
||||
enddo
|
||||
ncand=1
|
||||
candidate(1,1)=imax*df
|
||||
|
||||
return
|
||||
end subroutine getcandidates2
|
||||
Loading…
Reference in New Issue
Block a user