mirror of
https://github.com/saitohirga/WSJT-X.git
synced 2024-11-25 05:38:46 -05:00
108 lines
2.7 KiB
Fortran
108 lines
2.7 KiB
Fortran
|
subroutine azdist(MyGrid,HisGrid,utch,nAz,nEl,nDmiles,nDkm,nHotAz,nHotABetter)
|
||
|
|
|
||
|
|
character*6 MyGrid,HisGrid,mygrid0,hisgrid0
|
||
|
|
real*8 utch,utch0
|
||
|
|
logical HotABetter,IamEast
|
||
|
|
real eltab(22),daztab(22)
|
||
|
|
data eltab/18.,15.,13.,11.,9.,8.,7.,6.,5.3,4.7,4.,3.3,2.7, &
|
||
|
|
2.,1.5,1.,0.8,0.6,0.4,0.2,0.0,0.0/
|
||
|
|
data daztab/21.,18.,16.,15.,14.,13.,12.,11.,10.7,10.3,10., &
|
||
|
|
10.,10.,10.,10.,10.,10.,9.,9.,9.,8.,8./
|
||
|
|
data mygrid0/" "/,hisgrid0/" "/,utch0/-999.d0/
|
||
|
|
save
|
||
|
|
|
||
|
|
if(MyGrid.eq.HisGrid) then
|
||
|
|
naz=0
|
||
|
|
nel=0
|
||
|
|
ndmiles=0
|
||
|
|
ndkm=0
|
||
|
|
nhotaz=0
|
||
|
|
nhotabetter=1
|
||
|
|
go to 999
|
||
|
|
endif
|
||
|
|
|
||
|
|
if(mygrid.eq.mygrid0 .and. hisgrid.eq.hisgrid0 .and. &
|
||
|
|
abs(utch-utch0).lt.0.1666667d0) go to 900
|
||
|
|
utch0=utch
|
||
|
|
mygrid0=mygrid
|
||
|
|
hisgrid0=hisgrid
|
||
|
|
utchours=utch
|
||
|
|
|
||
|
|
if(MyGrid(5:5).eq.' ') MyGrid(5:5)='m'
|
||
|
|
if(MyGrid(6:6).eq.' ') MyGrid(6:6)='m'
|
||
|
|
if(HisGrid(5:5).eq.' ') HisGrid(5:5)='m'
|
||
|
|
if(HisGrid(6:6).eq.' ') HisGrid(6:6)='m'
|
||
|
|
|
||
|
|
if(MyGrid.eq.HisGrid) then
|
||
|
|
Az=0.
|
||
|
|
Dmiles=0.
|
||
|
|
Dkm=0.0
|
||
|
|
El=0.
|
||
|
|
HotA=0.
|
||
|
|
HotB=0.
|
||
|
|
HotABetter=.true.
|
||
|
|
go to 900
|
||
|
|
endif
|
||
|
|
|
||
|
|
call grid2deg(MyGrid,dlong1,dlat1)
|
||
|
|
call grid2deg(HisGrid,dlong2,dlat2)
|
||
|
|
call geodist(dlat1,dlong1,dlat2,dlong2,Az,Baz,Dkm)
|
||
|
|
|
||
|
|
ndkm=Dkm/100
|
||
|
|
j=ndkm-4
|
||
|
|
if(j.lt.1) j=1
|
||
|
|
if(j.gt.21)j=21
|
||
|
|
if(Dkm.lt.500.0) then
|
||
|
|
El=18.0
|
||
|
|
else
|
||
|
|
u=(Dkm-100.0*ndkm)/100.0
|
||
|
|
El=(1.0-u)*eltab(j) + u*eltab(j+1)
|
||
|
|
endif
|
||
|
|
|
||
|
|
daz=daztab(j) + u * (daztab(j+1)-daztab(j))
|
||
|
|
Dmiles=Dkm/1.609344
|
||
|
|
|
||
|
|
tmid=mod(UTChours-0.5*(dlong1+dlong2)/15.0+48.0,24.0)
|
||
|
|
IamEast=.false.
|
||
|
|
if(dlong1.lt.dlong2) IamEast=.true.
|
||
|
|
if(dlong1.eq.dlong2 .and. dlat1.gt.dlat2) IamEast=.false.
|
||
|
|
azEast=baz
|
||
|
|
if(IamEast) azEast=az
|
||
|
|
if((azEast.ge.45.0 .and. azEast.lt.135.0) .or. &
|
||
|
|
(azEast.ge.225.0 .and. azEast.lt.315.0)) then
|
||
|
|
! The path will be taken as "east-west".
|
||
|
|
HotABetter=.true.
|
||
|
|
if(abs(tmid-6.0).lt.6.0) HotABetter=.false.
|
||
|
|
if((dlat1+dlat2)/2.0 .lt. 0.0) HotABetter=.not.HotABetter
|
||
|
|
else
|
||
|
|
! The path will be taken as "north-south".
|
||
|
|
HotABetter=.false.
|
||
|
|
if(abs(tmid-12.0).lt.6.0) HotABetter=.true.
|
||
|
|
endif
|
||
|
|
if(IamEast) then
|
||
|
|
HotA = Az - daz
|
||
|
|
HotB = Az + daz
|
||
|
|
else
|
||
|
|
HotA = Az + daz
|
||
|
|
HotB = Az - daz
|
||
|
|
endif
|
||
|
|
if(HotA.lt.0.0) HotA=HotA+360.0
|
||
|
|
if(HotA.gt.360.0) HotA=HotA-360.0
|
||
|
|
if(HotB.lt.0.0) HotB=HotB+360.0
|
||
|
|
if(HotB.gt.360.0) HotB=HotB-360.0
|
||
|
|
|
||
|
|
900 continue
|
||
|
|
naz=nint(Az)
|
||
|
|
nel=nint(el)
|
||
|
|
nDmiles=nint(Dmiles)
|
||
|
|
nDkm=nint(Dkm)
|
||
|
|
nHotAz=nint(HotB)
|
||
|
|
nHotABetter=0
|
||
|
|
if(HotABetter) then
|
||
|
|
nHotAz=nint(HotA)
|
||
|
|
nHotABetter=1
|
||
|
|
endif
|
||
|
|
|
||
|
|
999 return
|
||
|
|
end subroutine azdist
|