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New frame format, new symbol lengths and ndown values, gen_fst280wave now returns a waveform aligned so that first message symbol starts at t=1s.

This commit is contained in:
Steven Franke 2020-06-24 15:15:20 -05:00
parent 31f98b94b9
commit f06f5d77a5
4 changed files with 66 additions and 31 deletions
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8
lib/fst280/fst280sim.f90
View File

@ -49,9 +49,9 @@ program fst280sim
nsps=0
if(nsec.eq.15) nsps=800
if(nsec.eq.30) nsps=1680
if(nsec.eq.60) nsps=4000
if(nsec.eq.120) nsps=8400
if(nsec.eq.300) nsps=21504
if(nsec.eq.60) nsps=3888
if(nsec.eq.120) nsps=8200
if(nsec.eq.300) nsps=21168
if(nsps.eq.0) then
print*,'Invalid TR sequence length.'
go to 999
@ -99,7 +99,7 @@ program fst280sim
icmplx=1
f0=f00+1.5*hmod*baud
call gen_fst280wave(itone,NN,nsps,nmax,fsample,hmod,f0,icmplx,c0,wave)
k=nint((xdt+1.0)/dt)-nsps
k=nint(xdt/dt)
c0=cshift(c0,-k)
if(k.gt.0) c0(0:k-1)=0.0
if(k.lt.0) c0(nmax+k:nmax-1)=0.0

3
lib/fst280/gen_fst280wave.f90
View File

@ -68,6 +68,7 @@ subroutine gen_fst280wave(itone,nsym,nsps,nwave,fsample,hmod,f0, &
enddo
! Compute the ramp-up and ramp-down symbols
kshift=nsps-nint(fsample)
if(icmplx.eq.0) then
wave(1:nsps/2)=0.0
wave(nsps/2+1:nsps)=wave(nsps/2+1:nsps) * &
@ -76,6 +77,7 @@ subroutine gen_fst280wave(itone,nsym,nsps,nwave,fsample,hmod,f0, &
wave(k1+nsps/2:)=0.0
wave(k1:k1+nsps/2-1)=wave(k1:k1+nsps/2-1) * &
(1.0+cos(twopi*(/(i,i=0,nsps/2-1)/)/real(nsps)))/2.0
wave=cshift(wave,kshift)
else
cwave(1:nsps/2)=0.0
cwave(nsps/2+1:nsps)=cwave(nsps/2+1:nsps) * &
@ -84,6 +86,7 @@ subroutine gen_fst280wave(itone,nsym,nsps,nwave,fsample,hmod,f0, &
cwave(k1+nsps/2:)=0.0
cwave(k1:k1+nsps/2-1)=cwave(k1:k1+nsps/2-1) * &
(1.0+cos(twopi*(/(i,i=0,nsps/2-1)/)/real(nsps)))/2.0
cwave=cshift(cwave,kshift)
endif
! call system_clock(count1,clkfreq)

14
lib/fst280/genfst280.f90
View File

@ -92,11 +92,17 @@ subroutine genfst280(msg0,ichk,msgsent,msgbits,i4tone,iwspr)
if(is.eq.3) itmp(i)=2
enddo
i4tone(1:8)=isyncword
i4tone(9:78)=itmp(1:70)
i4tone(1:7)=itmp(1:7)
i4tone(8:14)=itmp(15:21)
i4tone(15:35)=itmp(29:49)
i4tone(36:43)=isyncword
i4tone(44:78)=itmp(50:84)
i4tone(79:86)=isyncword
i4tone(87:156)=itmp(71:140)
i4tone(157:164)=isyncword
i4tone(87:121)=itmp(85:119)
i4tone(122:129)=isyncword
i4tone(130:150)=itmp(120:140)
i4tone(151:157)=itmp(22:28)
i4tone(158:164)=itmp(8:14)
999 return

72
lib/fst280_decode.f90
View File

@ -72,18 +72,19 @@ contains
if(hmod.eq.4) ndown=10
if(hmod.eq.8) ndown=5
else if(ntrperiod.eq.60) then
nsps=4000
nsps=3888
nmax=60*12000
ndown=100/hmod
if(hmod.eq.8) ndown=16
ndown=96/hmod
if(hmod.eq.1) ndown=108
else if(ntrperiod.eq.120) then
nsps=8400
nsps=8200
nmax=120*12000
ndown=200/hmod
if(hmod.eq.1) ndown=205
ndown=100/hmod
else if(ntrperiod.eq.300) then
nsps=21504
nsps=21168
nmax=300*12000
ndown=512/hmod
ndown=504/hmod
end if
nss=nsps/ndown
fs=12000.0 !Sample rate
@ -239,7 +240,7 @@ contains
ncand=ic
do icand=1,ncand
fc_synced=candidates(icand,3)
isbest=nint(candidates(icand,4))
isbest=nint(candidates(icand,4))
xdt=(isbest-nspsec)/fs2
call fst280_downsample(c_bigfft,nfft1,ndown,fc_synced,c2)
@ -256,26 +257,51 @@ contains
hbits=0
where(bitmetrics(:,1).ge.0) hbits=1
ns1=count(hbits( 1: 8).eq.(/0,0,0,1,1,0,1,1/))
ns2=count(hbits( 9: 16).eq.(/0,1,0,0,1,1,1,0/))
ns1=count(hbits( 71: 78).eq.(/0,0,0,1,1,0,1,1/))
ns2=count(hbits( 79: 86).eq.(/0,1,0,0,1,1,1,0/))
ns3=count(hbits(157:164).eq.(/0,0,0,1,1,0,1,1/))
ns4=count(hbits(165:172).eq.(/0,1,0,0,1,1,1,0/))
ns5=count(hbits(313:320).eq.(/0,0,0,1,1,0,1,1/))
ns6=count(hbits(321:328).eq.(/0,1,0,0,1,1,1,0/))
ns5=count(hbits(243:250).eq.(/0,0,0,1,1,0,1,1/))
ns6=count(hbits(251:258).eq.(/0,1,0,0,1,1,1,0/))
nsync_qual=ns1+ns2+ns3+ns4+ns5+ns6
if(nsync_qual.lt. 26) cycle !### Value ?? ###
scalefac=2.83
llra( 1:140)=bitmetrics( 17:156, 1)
llra(141:280)=bitmetrics(173:312, 1)
llra( 1: 14)=bitmetrics( 1: 14, 1)
llra( 15: 28)=bitmetrics(315:328, 1)
llra( 29: 42)=bitmetrics( 15: 28, 1)
llra( 43: 56)=bitmetrics(301:314, 1)
llra( 57: 98)=bitmetrics( 29: 70, 1)
llra( 99:168)=bitmetrics( 87:156, 1)
llra(169:238)=bitmetrics(173:242, 1)
llra(239:280)=bitmetrics(259:300, 1)
llra=scalefac*llra
llrb( 1:140)=bitmetrics( 17:156, 2)
llrb(141:280)=bitmetrics(173:312, 2)
llrb( 1: 14)=bitmetrics( 1: 14, 2)
llrb( 15: 28)=bitmetrics(315:328, 2)
llrb( 29: 42)=bitmetrics( 15: 28, 2)
llrb( 43: 56)=bitmetrics(301:314, 2)
llrb( 57: 98)=bitmetrics( 29: 70, 2)
llrb( 99:168)=bitmetrics( 87:156, 2)
llrb(169:238)=bitmetrics(173:242, 2)
llrb(239:280)=bitmetrics(259:300, 2)
llrb=scalefac*llrb
llrc( 1:140)=bitmetrics( 17:156, 3)
llrc(141:280)=bitmetrics(173:312, 3)
llrc( 1: 14)=bitmetrics( 1: 14, 3)
llrc( 15: 28)=bitmetrics(315:328, 3)
llrc( 29: 42)=bitmetrics( 15: 28, 3)
llrc( 43: 56)=bitmetrics(301:314, 3)
llrc( 57: 98)=bitmetrics( 29: 70, 3)
llrc( 99:168)=bitmetrics( 87:156, 3)
llrc(169:238)=bitmetrics(173:242, 3)
llrc(239:280)=bitmetrics(259:300, 3)
llrc=scalefac*llrc
llrd( 1:140)=bitmetrics( 17:156, 4)
llrd(141:280)=bitmetrics(173:312, 4)
llrd( 1: 14)=bitmetrics( 1: 14, 4)
llrd( 15: 28)=bitmetrics(315:328, 4)
llrd( 29: 42)=bitmetrics( 15: 28, 4)
llrd( 43: 56)=bitmetrics(301:314, 4)
llrd( 57: 98)=bitmetrics( 29: 70, 4)
llrd( 99:168)=bitmetrics( 87:156, 4)
llrd(169:238)=bitmetrics(173:242, 4)
llrd(239:280)=bitmetrics(259:300, 4)
llrd=scalefac*llrd
apmask=0
@ -329,7 +355,7 @@ contains
else
xsnr=-99.9
endif
!write(*,*) xsig,base,arg,xsnr
!write(*,*) xsig,base,arg,xsnr,nsync_qual,ntype,nharderrors,dmin,msg
endif
nsnr=nint(xsnr)
iaptype=0
@ -400,9 +426,9 @@ contains
f0save=f0
endif
i1=i0 !Costas arrays
i1=i0+35*nss !Costas arrays
i2=i0+78*nss
i3=i0+156*nss
i3=i0+121*nss
s1=0.0
s2=0.0