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Add initial version of test_ft8q3.f90.

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This commit is contained in:
Joe Taylor 2021-10-26 12:31:24 -04:00
parent 0ed62e4f80
commit 384899754f
2 changed files with 87 additions and 2 deletions
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5
CMakeLists.txt
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@ -424,6 +424,7 @@ set (wsjt_FSRCS
lib/ft8/ft8code.f90
lib/ft8/ft8_downsample.f90
lib/ft8/ft8q3.f90
lib/ft8/test_ft8q3.f90
lib/ft8/ft8sim.f90
lib/gen4.f90
lib/gen65.f90
@ -1178,8 +1179,8 @@ target_link_libraries (ft4code wsjt_fort wsjt_cxx)
add_executable (ft8sim lib/ft8/ft8sim.f90)
target_link_libraries (ft8sim wsjt_fort wsjt_cxx)
add_executable (ft8q3 lib/ft8/ft8q3.f90)
target_link_libraries (ft8q3 wsjt_fort wsjt_cxx)
add_executable (test_ft8q3 lib/ft8/test_ft8q3.f90)
target_link_libraries (test_ft8q3 wsjt_fort wsjt_cxx)
add_executable (msk144sim lib/msk144sim.f90)
target_link_libraries (msk144sim wsjt_fort wsjt_cxx)

84
lib/ft8/test_ft8q3.f90 Normal file
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@ -0,0 +1,84 @@
program test_ft8q3
! Test q3-style decodes for FT8.
use packjt77
parameter(NN=79,NSPS=32)
parameter(NWAVE=NN*NSPS) !2528
parameter(NZ=3200,NLAGS=NZ-NWAVE)
character arg*12
character msg37*37
character c77*77
complex cwave(0:NWAVE-1)
complex cd(0:NZ-1)
complex z
real xjunk(NWAVE)
real ccf(0:NLAGS-1)
integer itone(NN)
integer*1 msgbits(77)
! Get command-line argument(s)
nargs=iargc()
if(nargs.ne.3) then
print*,'Usage: ft8q3 DT f0 "message"'
go to 999
endif
call getarg(1,arg)
read(arg,*) xdt !Time offset from nominal (s)
call getarg(2,arg)
read(arg,*) f0 !Frequency (Hz)
call getarg(3,msg37) !Message to be transmitted
fs=200.0 !Sample rate (Hz)
dt=1.0/fs !Sample interval (s)
bt=2.0
! Source-encode, then get itone()
i3=-1
n3=-1
call pack77(msg37,i3,n3,c77)
call genft8(msg37,i3,n3,msgsent37,msgbits,itone)
! Generate complex cwave
call gen_ft8wave(itone,NN,NSPS,bt,fs,f0,cwave,xjunk,1,NWAVE)
do i=0,NZ-1
read(40,3040) cd(i)
3040 format(17x,2f10.3)
enddo
lagbest=-1
ccfbest=0.
nsum=32*2
do lag=0,nlags-1
z=0.
s=0.
do i=0,NWAVE-1
z=z + cd(i+lag)*conjg(cwave(i))
if(mod(i,nsum).eq.nsum-1 .or. i.eq.NWAVE-1) then
s=s + abs(z)
z=0.
endif
enddo
! ccf(lag)=abs(z)
ccf(lag)=s
write(42,3042) lag-100,(lag-100)/200.0,ccf(lag)
3042 format(i5,f10.3,f10.0)
if(ccf(lag).gt.ccfbest) then
ccfbest=ccf(lag)
lagbest=lag
endif
enddo
z=0.
do i=0,NWAVE-1
z=z + cd(i+lagbest)*conjg(cwave(i))
if(mod(i,32).eq.31) then
amp=abs(z)**2
pha=atan2(aimag(z),real(z))
j=i/32
write(43,3043) z,j,amp,pha
3043 format(2f12.0,i6,f12.0,f12.6)
endif
enddo
999 end program test_ft8q3