Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.naic.edu/~phil/tsys/polTsysLbw_apr03.html
Дата изменения: Fri May 9 00:02:31 2003 Дата индексирования: Tue Oct 2 07:56:29 2012 Кодировка: Поисковые слова: south pole |
The data was also used to measure compression of the system by the various radars and to watch the sun move in the sidelobes of the telescope. Since the data was taken through noon, some of the swings were corrupted by the sun in the sidelobes. Another problem occurred on 27mar03 with a drift in sbc1 polB caused by a loose cable in a chassis of the correlator (this was later corrected).run the correlator with 25 Mhz bandwidth, at 1405/1415 Mhz, sampling at 1 second intervals. Set the lbw receiver to linear polarization (hybrid out). drive the telescope in az at .2 deg/sec (half slew) from az 270 to 630. Do this at za=2,4.5,7,9.5,12,14.5,17, and 19.5 deg (reversing direction on each swing). Fire the cal 4 times during the measurements to convert to kelvins. For each az swing compute TsysPola- TsysPolB. Fit a 2 az sine wave to each swing: polDif=TsysA-TsysB=A*sin(2*az + phase) + constant. The data was taken 10:40 to 15:00 on 27mar03 and 10:50 to 15:10 on 17apr03.
The plots show the difference TsysA-TsysB vs az and za for this dataset:
home_~phil