2006-09-06 18:09:05 +00:00
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subroutine astro(AppDir,nyear,month,nday,uth,nfreq,Mygrid,
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+ NStation,mode,MoonDX,AzSun,ElSun,AzMoon,ElMoon0,
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+ ntsky,doppler00,doppler,dbMoon,RAMoon,DecMoon,HA,Dgrd,sd,
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+ poloffset,xnr,auxra,auxdec,azaux,elaux)
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C Computes astronomical quantities for display in JT65, CW, and EME Echo mode.
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C NB: may want to smooth the Tsky map to 10 degrees or so.
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character*80 AppDir,fname
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character*6 MyGrid,HisGrid
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logical first,ltsky
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real LST
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real lat,lon
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real ldeg
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integer*1 n1sky(129600)
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integer*2 nsky
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common/sky/ nsky(360,180)
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common/echo/xdop(2),techo,ElMoon,mjd
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equivalence (n1sky,nsky)
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data first/.true./
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data rad/57.2957795/
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save first
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if(first) then
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do i=80,1,-1
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if(ichar(AppDir(i:i)).ne.0 .and.
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+ ichar(AppDir(i:i)).ne.32) goto 1
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enddo
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1 lenappdir=i
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call zero(nsky,180*180)
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fname=Appdir(1:lenappdir)//'/TSKY.DAT'
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#ifdef Win32
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open(13,file=fname,status='old',form='binary',err=10)
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read(13) nsky
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close(13)
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#else
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call rfile2(fname,nsky,129600,nr)
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if(nr.ne.129600) go to 10
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#endif
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ltsky=.true.
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first=.false.
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endif
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go to 20
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10 ltsky=.false.
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20 call grid2deg(MyGrid,elon,lat)
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lon=-elon
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call sun(nyear,month,nday,uth,lon,lat,RASun,DecSun,LST,
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+ AzSun,ElSun,mjd)
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freq=nfreq*1.e6
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call MoonDop(nyear,month,nday,uth,lon,lat,RAMoon,DecMoon,
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+ LST,HA,AzMoon,ElMoon,ldeg,bdeg,vr,dist)
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C Compute spatial polarization offset
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xx=sin(lat/rad)*cos(ElMoon/rad) - cos(lat/rad)*
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+ cos(AzMoon/rad)*sin(ElMoon/rad)
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yy=cos(lat/rad)*sin(AzMoon/rad)
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if(NStation.eq.1) poloffset1=rad*atan2(yy,xx)
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if(NStation.eq.2) poloffset2=rad*atan2(yy,xx)
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techo=2.0 * dist/2.99792458e5 !Echo delay time
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doppler=-freq*vr/2.99792458e5 !One-way Doppler
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t408=ftsky(ldeg,bdeg) !Read sky map
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tsky=t408*(408.0/nfreq)**2.6 !Tsky for obs freq
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if(ltsky.and.(tsky.lt.3.0)) tsky=3.0 !Minimum = 3 Kelvin
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xdop(NStation)=doppler
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if(NStation.eq.2) then
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HisGrid=MyGrid
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go to 900
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endif
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doppler00=2.0*xdop(1)
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if(mode.eq.2 .or. mode.eq.5) doppler=xdop(1)+xdop(2)
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if(mode.eq.3) doppler=2.0*xdop(1)
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dBMoon=-40.0*log10(dist/356903.)
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sd=16.23*370152.0/dist
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! if(NStation.eq.1 .and. MoonDX.ne.0 .and.
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! + (mode.eq.2 .or. mode.eq.5)) then
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if(NStation.eq.1 .and. MoonDX.ne.0) then
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poloffset=mod(poloffset2-poloffset1+720.0,180.0)
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if(poloffset.gt.90.0) poloffset=poloffset-180.0
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x1=abs(cos(2*poloffset/rad))
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if(x1.lt.0.056234) x1=0.056234
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xnr=-20.0*log10(x1)
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if(HisGrid(1:1).lt.'A' .or. HisGrid(1:1).gt.'Z') xnr=0
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endif
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tr=80.0 !Good preamp
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tskymin=13.0*(408.0/nfreq)**2.6 !Cold sky temperature
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tsysmin=tskymin+tr
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tsys=tsky+tr
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dgrd=-10.0*log10(tsys/tsysmin) + dbMoon
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900 ElMoon0=Elmoon
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ntsky=nint(tsky)
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auxHA = 15.0*(LST-auxra) !HA in degrees
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pi=3.14159265
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pio2=0.5*pi
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call coord(pi,pio2-lat/rad,0.0,lat/rad,auxha*pi/180.0,
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+ auxdec/rad,azaux,elaux)
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AzAux=azaux*rad
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ElAux=ElAux*rad
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return
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end
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