Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.naic.edu/~phil/usrproj/a1963/a1963.html
Дата изменения: Fri Mar 25 17:29:27 2005
Дата индексирования: Sat Dec 22 05:01:18 2007
Кодировка:
A1963: alfa precursor survey of ngc2903
mar05
Intro:
a1963 is doing a deep map of ngc2903 and its surrounding
area. The setup is 12.5 Mhz centered at 1417 Mhz. Each nite a
map of the area is taken using drift scans:
Go to the edge of the map and do a 480 sec drift scan. Then do a 1 second
calon/caloff pair.
move the telescope to the start of the next strip, rotate the alfa
feed to maintain a constant parallactic angle, and then do another
drift, cal pair.
Continue doing consecutive strips until the source sets.
On the following days start over with the map.
Some days may not have complete maps so you may need to fill in the pieces.
Use the gui routine azimuth fixed drift for the mapping.
Eventually all of the maps will be added together.