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106 lines
3.6 KiB
Fortran
106 lines
3.6 KiB
Fortran
subroutine astro(nyear,month,nday,uth,nfreq,Mygrid,NStation,MoonDX, &
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AzSun,ElSun,AzMoon0,ElMoon0,ntsky,doppler00,doppler,dbMoon,RAMoon, &
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DecMoon,HA,Dgrd,sd,poloffset,xnr,day,lon,lat,LST)
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! Computes astronomical quantities for display and tracking.
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! NB: may want to smooth the Tsky map to 10 degrees or so.
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character*6 MyGrid,HisGrid
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real LST
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real lat,lon
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integer*2 nt144(180)
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! common/echo/xdop(2),techo,AzMoon,ElMoon,mjd
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real xdop(2)
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data rad/57.2957795/
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data nt144/ &
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234, 246, 257, 267, 275, 280, 283, 286, 291, 298, &
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305, 313, 322, 331, 341, 351, 361, 369, 376, 381, &
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383, 382, 379, 374, 370, 366, 363, 361, 363, 368, &
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376, 388, 401, 415, 428, 440, 453, 467, 487, 512, &
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544, 579, 607, 618, 609, 588, 563, 539, 512, 482, &
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450, 422, 398, 379, 363, 349, 334, 319, 302, 282, &
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262, 242, 226, 213, 205, 200, 198, 197, 196, 197, &
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200, 202, 204, 205, 204, 203, 202, 201, 203, 206, &
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212, 218, 223, 227, 231, 236, 240, 243, 247, 257, &
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276, 301, 324, 339, 346, 344, 339, 331, 323, 316, &
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312, 310, 312, 317, 327, 341, 358, 375, 392, 407, &
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422, 437, 451, 466, 480, 494, 511, 530, 552, 579, &
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612, 653, 702, 768, 863,1008,1232,1557,1966,2385, &
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2719,2924,3018,3038,2986,2836,2570,2213,1823,1461, &
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1163, 939, 783, 677, 602, 543, 494, 452, 419, 392, &
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373, 360, 353, 350, 350, 350, 350, 350, 350, 348, &
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344, 337, 329, 319, 307, 295, 284, 276, 272, 272, &
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273, 274, 274, 271, 266, 260, 252, 245, 238, 231/
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save
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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,AzSun,ElSun,mjd,day)
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freq=nfreq*1.e6
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if(nfreq.eq.2) freq=1.8e6
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if(nfreq.eq.4) freq=3.5e6
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call MoonDop(nyear,month,nday,uth,lon,lat,RAMoon,DecMoon,LST,HA, &
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AzMoon,ElMoon,vr,dist)
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! Compute spatial polarization offset
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xx=sin(lat/rad)*cos(ElMoon/rad) - cos(lat/rad)*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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call coord(0.,0.,-1.570796,1.161639,RAMoon/rad,DecMoon/rad,el,eb)
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longecl_half=nint(rad*el/2.0)
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if(longecl_half.lt.1 .or. longecl_half.gt.180) longecl_half=180
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t144=nt144(longecl_half)
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tsky=(t144-2.7)*(144.0/nfreq)**2.6 + 2.7 !Tsky for obs freq
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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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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.'R') 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 AzMoon0=Azmoon
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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 subroutine astro
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