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: http://www.naic.edu/~phil/sysperf/chkflux/chkflux.html
Дата изменения: Tue Mar 29 18:04:23 2016 Дата индексирования: Mon Apr 11 03:57:14 2016 Кодировка: Поисковые слова: arp 220 |
The plots below show the gain ratio for all calibration sources plotted versus frequency. There are 4 plots per page. Each plot holds 5 sources. Sources are distinguished by color and symbol. The large variation for some sources (especially at higher frequencies) is caused by collimation errors (and the gain fits inability to fit it).
let y=log10(fluxJy) let x=log10(freqMhz) y= a0 + a1*x + a2*exp(-x)To compute a gain curve for a receiver we do a number of calibration scans using some of the calibration sources and then fit the gain as a function of azimuth and zenith angle.
To check that the source fluxes used are ok we
have
computed:
We do this for each calibration scan taken for all receivers.
Some things to keep in mind are:
Systemp_performance page:
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